The smaller charges of the ions cause RbCl to have a higher melting point.
Which ionic compound has the highest melting point How do you know?
I The Ion Charge
In general, the higher the melting point, the stronger the ionic bond, the stronger the electrostatic attraction, and the higher the charge.
Why are ionic solids more flammable than covalent solids?
In ionic compounds, a strong electrostatic force holds the cation and anions together. The link that holds particles together and the attractive force that pulls them apart is known as the electrostatic force. The high melting point is a result of how challenging it is to separate the particles from one another.
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A pitching machine is used to pitch two balls. The speed of both balls is 94 km/hr. The mass of one ball is 5 grams, and the mass of the other ball is 50 grams. Since both balls are traveling at the same speed, which of the following is true? Responses The 5-gram ball has more kinetic energy than the 50-gram ball. The 5-gram ball has more kinetic energy than the 50-gram ball. The balls have the same kinetic energy.
A) The balls have the same kinetic energy.
B) The 50-gram ball has more kinetic energy than the 5-gram ball.
C)The 50-gram ball has more kinetic energy than the 5-gram ball.
D) Neither ball has any kinetic energy.
Answer: b
Explanation:
complete the following: ( note: formulas should be entered like the following example: potassium sulfate - k2so4 , another example: zinc nitrate - zn(no3)2 ) compound ionic or covalent formula sodium oxide covalent so iron(iii) bromide ionic febr3 sodium carbonate ionic na2co3 carbon tetrachloride covalent ccl4 nitrogen tribromide covalent nbr3
Compound Ionic or Covalent Formula
sodium oxide Ionic Na2O
iron(III) bromide Ionic FeBr3
sodium carbonate Ionic Na2CO3
carbon tetrachloride covalent CCl4
nitrogen tribromide covalent NBr3
Ionic bonds, which occur when two negatively charged ions join forces with positively charged ones, are formed when one atom transfers electrons to the other. Ionic bonds may be seen in the chemical compound sodium chloride.
A: The oxygen molecule is held together by two covalent bonds because the two oxygen atoms share two pairs of electrons. Two atoms, in this case oxygen and hydrogen, share electrons to form covalent bonds. Each end of the V-shaped H2O molecule assumes a slightly different charge as a result of the uneven attraction of oxygen and hydrogen to the shared electrons.
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in a titration experiment, h2o2(aq) reacts with aqueous mno4-(aq) as represented by the equation above. the dark purple kmno4 solution is added from a buret to a colorless, acidified solution of h2o2(aq) in an erlenmeyer flask. (note: at the end point of the titration, the solution is a pale pink color.) at a certain time during the titration, the rate of appearance of o2(g) was 1.0 x 10-3 mol/(l⋅s). what was the rate of disappearance of mno4- at the same time?
MnO4 is disappearance at a rate of 4.0 x 10-4 mol/L at the same period.
An experiment involving titration requires what?You will need a calibrated burette, a burette stand, numerous beakers or Erlenmeyer flasks, a measured amount of your analyte, and a significant amount of your titrant to perform a titration. Start by adding a little amount of color indicator to the analyte in your beaker.
What is a titration experiment's conclusion?With the use of an indicator, the 'end point' of the titration is found when the color of the solution changes as a result of neutralization. It is feasible to link the concentration of the acid to the concentration of the base by calculating the volume of titrant necessary to achieve the "end point."
40 cm^3 diluted to 250 cm^3 means the dilution ratio of 250/40 = 6.25 times. Hence, the NaOH concentration is reduced by 1/6.25 = 0.16 times.
20 cm^3 is 0.02 dm^3.
That much of 0.05 M sulfuric acid contains 0.02 * 0.05 = 0.001 moles of H2SO4.
It reacts with NaOH at 1:2 molar ratio, which means 0.002 moles of NaOH were titrated.
That amount is found in 25 cm^3 = 0.025 dm^3 of the diluted solution, which yields its concentration to be 0.002 / 0.025 = 0.08 M.
Multiplying that result by dilution ratio gives 6.25 * 0.08 M = 0.5 M as the original concentration.
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peleaste help me :(
The increase in the ocean's average water temperature during mid months of the year may be associated with the summer season and therefore those cities should be located in the northern hemisphere.
Why does temperature vary in the Hemispheres?Temperature varies in the Hemispheres due to the amount of solar radiation received by the earth's surface, which is higher during mid-months (i.e. June, July and August) in the northern hemisphere.
Therefore, with this data, we can see that temperature varies in the hemispheres according to the month which is associated with the solar radiation received in these months.
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why is potassium dihydrogen arsenate a duller color than potassium nitrate? potassium dihydrogen arsenate has a more stable excited state, so the emitted light is dimmer. potassium dihydrogen arsenate is heavier, so it does not excite as intensely. potassium dihydrogen arsenate also contains arsenic, which is a dull blue color. potassium dihydrogen arsenate is often contaminated with sodium, which dulls the color of light emitted.
Potassium dihydrogen arsenate has a more stable excited state than potassium nitrate, so the emitted light is dimmer.
Potassium nitrate (KNO3) is an ionic white crystalline salt made up of potassium ions and nitrate ions. It is also known as saltpeter or nitre. Manufacturing fertilizers, pesticides, glass, fireworks, explosives, and rocket fuel are among the uses of potassium nitrate. When added to meat, it triggers a reaction between the myoglobin and hemoglobin in the blood, giving the meat its red color. It is also used as a food preservative. Additionally, some toothpastes use it as an additive to lessen tooth sensitivity. When it comes to human consumption, potassium nitrate use is strictly regulated because it is toxic at high doses.
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Which of the following is a paleoclimate proxy? O A Written temperature records from the summer of 1863 OB Measurements of fossilized tree rings from the Cretaceous period O c A database of satellite temperature data, from 1970 through present © D All of the above
Measurements of fossilized tree rings from the Cretaceous period is a paleoclimate proxy. -database of satellite temperature data,
An animal or plant from a previous geologic era that has been preserved in the Earth's crust as a fossil, remnant, impression, or trace. The main repository for knowledge regarding the evolution of life on Earth is the complex of information preserved in fossils found all across the world.
fossils of dinosaurs discovered in Alberta, Canada. Only a small percentage of extinct species have been preserved as fossils, and often only those with a sturdy skeleton are capable of doing so. A calcareous skeleton or shell is present in the majority of major groups of invertebrate creatures (e.g., corals, mollusks, brachiopods, bryozoans). Other types have silicon dioxide or calcium phosphate shells (both of which are found in the bones of vertebrates).
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questions: will the arsenic in well b-1 likely contaminate the water in clearwater lake? why or why not? in which direction is the contaminated water in well b-1 moving? which well will most likely show contamination of arsenic next?
Water desk elevation is the upper or below surface of the groundwater, when the soil or underlying rock material is wholly saturated with water. The water table can be contamination of ground water by hazarodus wastes, fertilisers, pesticides, acid rain etc
How can a element contaminate water table?
The water desk elevation of the Clearwater lake isn't always given. Assuming, the water desk elevation of B1 is 171ft. We recognize the idea that water flows from higher elevation to lower elevation. So the wells having elevation much less than 171 feet gets infected via way of means of B1 contaminants, however the ones are having better elevation that 171ft will no longer get infected.
And approximately the route of infected water, the infected water will float closer to the course in the Wells of decrease elevation than 171ft.
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carbon dioxide is carried in three forms in the blood. ranking them from greatest to least amount carried, the sequence would be:
The three forms of carbon dioxide in the blood ranking them from greatest to least amount carried, the sequence would be bicarbonate ion, carbamino hemoglobin, and dissolved in plasma.
Most carbon dioxide (about 70%) is transported as bicarbonate ions in the plasma. An increase in carbon dioxide in the blood will cause a slight increase in H+ concentration (drop in pH).
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Calculate the volume of 1. 0 x 10-4 m cv+ solution that needs to be added to a 25. 0 ml volumetric flask and diluted with deionized (di) water in order to prepare a calibration standard solution with a concentration of 1. 0 x 10-5 m cv+. As part of your preparation for performing this experiment, repeat this calculation for each of the calibration standards you would need to prepare in part i a of the experiment and record the information in your notes so that you have it ready during the lab session. Also calculate the volume of 1. 0 x 10-4 m cv+ solution required to prepare 10 ml of 3. 0 x 10-5 m cv+ solution to be used in part ii b of the experiment and record the information in your notes.
2.5 ml and 3 ml of solution, respectively, are needed to make the final concentration of.
What is calibration standard solution?Standard addition, internal standard, and external standard techniques to quantitation all employ calibration solutions. Calibrants can be made gravimetrically using reference standards or pure reference materials, but they can also be made on a volumetric or other fraction basis.
How do you prepare a calibration solution?Calculate the volume of stock solution needed for each calibration standard by deciding on its number (minimum 5) and concentration. As often as necessary, repeat the treatment. Select and create the dilution solution (such as a matrix solution or 1% acid, for example). Both the working curve method and the standard addition method can be used to calibrate an instrument.
Briefing:Calibration standard solution is the solution prepared of the known concentration for the plotting of standard curve.
For preparing the solution of known concentration and volume, the equation imputed is :
M1V1=M2V2
Where M1 and V1 are molarity and volume of known solution
M2 and V2 are molarity and volume of solution to be prepared.
Given, volume to be prepared V2 : 25 ml
concentration to be prepared : M_2:1×〖10〗^(-5) M
concentration of given solution : M_1:1×〖10〗^(-4) M
1×〖10〗^(-4)×V_1=1×〖10〗^(-5)×25
Volume of solution required is 2.5 ml.
The volume required to prepare 10 ml solution of 3×10-5 M is:
1×10-4×V1=3×10-5×10
Volume = 3 ml.
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Nuclear decay occurs according to first-order kinetics. Scandium-43 decays with a rate constant of 0. 178 days–1. After 15. 0 days, a sample has a mass of 1. 73 g. What was the original mass of the sample?.
According to the claim that nuclear decay follows first-order kinetics, the sample's original mass is 25.0 g.
Describe nuclear energy.The force found in a protons and neutrons, or core, is referred to as nuclear energy. All everything in the cosmos is made up of microscopic building blocks called atoms, and the nucleus is held together by energy.
What occurs in the event of a nuclear power station bombing?An enormous quantity of radioactive material might be spilled into the atmosphere in the event of a nuclear facility meltdown or explosion. If there had been an explosion, everyone inside the nuclear site would likely be poisoned and potentially hurt.
Briefing:
Expression for rate law for first order kinetics is given by:
t = 2.303/k * log(a/(a - x))
where,
k = rate constant = 0.178 days^-1
t = time passed by the sample = 15days
a = original or initial amount of the reactant
a - x = amount left after decay process = 1.73g
Now put all the given values in above equation, we get
15=(2.303/0.178) * log (a/1.73)
log (a/1.73) = 15 * 0.178/2.303
a/1.73 = 10^( 15*0.178/2.303)
a = 1.73 * 10^( 2670/2303)
a = 1.73 * 10^(1.15935736)
a = 1.73 * 14.433024871
a = 24.9691330268
Therefore, a is approximately 25 grams .
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the formation of the crystalline nacl lattice from sodium blank and chloride blank is highly exothermic and more than compensates for the blank electron transfer process. since the sodium ions are blank charged and the chlorine ions are blank charged, the potential energy blank, as described by blank law, when these ions come together to form a lattice. that energy is blank as heat when the lattice forms. g
The formation of the crystalline NaCl lattice from sodium cations and chloride anions is highly exothermic and more than compensates for the endothermicity of the electron transfer process. In other words, the formation of ionic compounds isn't exothermic because sodium wants to lose electrons and chlorine wants to gain them; rather, it's exothermic because of the large amount of heat released when sodium and chlorine ions coalesce to form a crystal lattice.
To conduct nerve impulses, contract and relax muscles, and maintain the right ratio of water and minerals, the human body needs a modest quantity of sodium. For these essential processes, it is estimated that humans require 500 mg of sodium salt every day.
A nose, throat, and eyes might get irritated when exposed to low amounts of chlorine. At greater concentrations, breathing chlorine gas may alter respiratory patterns, cause coughing, and harm the lungs. Chlorine exposure might cause serious additional symptoms. Chlorine exposure may be harmful to workers.
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5 g of gold and 25 g of silver are mixed to form a single-phase ideal solid solution. (a) how many moles of solution are there? (b) what are the mole fractions of gold and silver?
Mole fraction for silver= 0.2317643/0.3079193
= 0.7526787
Mole fraction for gold=0.076155/0.3079193
=0.2473212
What is Molar Fraction?
The mole fraction is the product of the number of molecules of a specific component in a mixture and its total molecular weight. It serves as a means of indicating how concentrated a solution is.
It is a unit of concentration, defined as the product of the moles of a component and the moles of the entire solution. When all the parts of a solution are summed up, their mole fraction equals 1.
molar mass of silver = 107.8682g/mol
Molar mass of gold= 196.96657g/mol
Therefore mole = mass/molar mass
For silver: 25g/107.8682g/mol = 0.2317643mol
For gold: 15g/196.96657g/mol= 0.076155mol
Total number of mole= 0.2317643+0.076155
= 0.30791193mol
Mole fraction for silver= 0.2317643/0.3079193
= 0.7526787
Mole fraction for gold=0.076155/0.3079193
=0.2473212
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which parameters are held constant in experiments 1 and 2? number of moles of gas temperature volume pressure
The parameters held constant in Experiment 1 are pressure and number of moles. The parameters held constant in Experiment 2 are temperature and number of moles.
What is apparent molecular weight of air?
The sum of the products of the mole fractions of each component times the molecular weight of that component is defined as apparent molecular weight.
What is pressure and temperature?
The force of all gas particle/wall collisions divided by the area of the wall is defined as pressure (P): Pressure is one of the primary observable quantities of this phase of matter; it is exerted by all gases.
Temperature is a measure of how hot or cold something is represented in terms of one of several scales, including Fahrenheit and Celsius. The direction in which heat energy will spontaneously flow is indicated by temperature.
The parameters held constant in Experiment 1 are pressure and number of moles. The parameters held constant in Experiment 2 are temperature and number of moles.
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What is the empirical formula of a compound that contains 29% na, 41% s, and 30% o by mass?
Na2so3 is the empirical formula for a compound that, by mass, contains 29% NA, 41% S, and 30%.
What is empirical formula of a compound?The empirical formula of a chemical compound in chemistry is the simplest whole number ratio of atoms in a compound. Two simple examples of this concept are the empirical formulas of sulfur monoxide, SO, and disulfur dioxide, S2O2. An empirical formula is a compound's chemical formula that only specifies the ratios of the elements it contains and not the precise number or arrangement of atoms. This would be the compound's element with the lowest whole number ratio.
How can you determine a compound's empirical formula?1. To solve an empirical formula problem, you must first determine the mass percentage of the constituent constituents.
2. Next, convert the percentage to grams.
3. Subtract each mass from its corresponding molar mass.
4. Select the moles answer that is the smallest and divide all numbers by that.
Briefing:1. Change every percentage to grams.
29% Na = 0.29g
41% S = 0.41 g S
30% O = 0.30 g O
2. Change every amount to moles.
0.29 g Na = 0.01261… moles Na
0.41 g S = 0.01278… moles S
0.30 g O = 0.01875 moles O
3. Divide each mole by the smallest one, then roughly
0.01261 mol Na /0.01261 approximately 1
0.001278 mol S/0.01261 approximately 1(rounded from 1.01348…)
0.01875 mol O/0.01261 approximately 1.5(rounded from 1.486915
4. Since one of the elements was rounded to a non-whole integer, we must multiply each element by 2 to obtain whole numbers.
Na: 1 * 2 = 2
S: 1 * 2 = 2
O: 1.5 * 2 = 3
5. Based on the numbers above, create the equation using subscripts for each element.
6. sodium thiosulfate (Na2S2O3)
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inthee2reaction,whatwasthepercentageof1-buteneproductformed?explain why the percentage of 1-butene formed was higher in the e2 reaction compared to the e1 reaction.
In the E2 reaction, the percentage of formation of 1- butene was 20.7%.
The E2 reaction is defined as the process that takes place in one-step, and the E1 reaction is defined as the two-step mechanism. The numbers are used to represent the kinetics of the reaction rather than the number of steps in the mechanism.
E2 is bimolecular (second-order) kinetics, whereas E1 is unimolecular (first-order) kinetics. The three key factors that affect E1 elimination reactions are the solvent type, the leaving group's shape, and the carbocation's stability.
Hence, the percentage of formation of 1- butene was 20.7% and the reason is explained above.
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Calculate the standard reaction entropy for the decomposition of 1 mol calcite to carbon dioxide gas and solid calcium oxide at 25°c.
A process employed entropy was 160.6 J/mol*K again for decomposition if 1 mol calcium calcite to dioxide and white precipitated oxide at 25 °C.
How do you define reaction in chemistry?One or more substances—known as reactants—are transformed into one or more other substances—known as products—in a chemical reaction. Substances are composed up of chemical components or chemical elements.
Explain type of rections?The five basic types of chemical processes are synthesis, breakdown, one, double replacement, and combustion. By analyzing both reactants and products, you can assign a reaction to one of these categories.
Briefing:CaCO3(s) → CaO (s) + CO2 (g)
ΔS° = (1 mol) [ΔS° for CaO (s)] + (1 mol) [ΔS° for CO2(g)] – (1 mol)[ΔS° for CaCO3(s)]
= (1 mol) (39.8 J/mol K) + (1 mol) (213.7 J/mol K) – (1 mol) (92.9 J/mol K)
= 160.6 J/K
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circle all of the species below that can form a hydrogen bond in its pure form. explain why the other species couldn't hydrogen bond
Since I2 was larger with more electrons, it has greater forces than N2, that is also nonpolar and only has London dispersion forces.
What is hydrogen used for?
Fuel cells may produce energy, power, and heat using hydrogen. The two industries where hydrogen is currently most widely employed are fertilizer manufacturing and petroleum refining, with the developing markets of utilities and transportation.
Can you drink hydrogen water?
Experts disagree whether consuming hydrogen water has any hazards. However, they were unsure if its advantages outweigh those of drinking regular water or being hydrated in general. Hypovolemia, which can be fatal, can result from excessive water intake.
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The following scientists made significant contributions to our understanding of the structure and function of DNA. Place the scientists' names in the correct chronological order, starting with the first scientist(s) to make a contribution.
I. Avery, McCarty, and MacLeod
II. Griffith
III. Hershey and Chase
IV. Meselson and Stahl
V. Watson and Crick
The correct order of the scientists who made significant contributions to our understanding of the structure and function of DNA is II, I , III, V, IV.
In molecular biology, DNA is describes as the most important component that carries genetic information.
In DNA, the particular information is stored which is processed to manufacture large macro-molecules such as proteins.
The genetic information and instructions are stored in large structures called chromosomes which are found in each cell.
Great number of short fragments of DNA join together to form chromosomes which play their role in mutation, replication, gene expressing and encoding of information.
Simply put, detailed 3D-model of DNA was suggested by Crick and Watson in 1993 which shows that DNA is a double helix structure made up of nucleotide chains and nitrogenous bases.
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a solution contains one or more of the following ions: ag ag , ca2 ca2 , and cu2 cu2 . when you add sodium chloride to the solution, no precipitate forms. when you add sodium sulfate to the solution, a white precipitate forms. you filter off the precipitate and add sodium carbonate to the remaining solution, producing another precipitate.
SO₄⁻² (aq) + Ca⁺₂(aq) → CaSO₄(s)
CO₃⁻²(aq) + Cu⁺²(aq) → CuCO₃(s).
when you add sodium chloride to the solution, no precipitate forms. when you add sodium sulfate to the solution, a white precipitate forms. you filter off the precipitate and add sodium carbonate to the remaining solution, producing another precipitate.
When sodium chloride (NaCl) is added to the solution, sodium chloride dissociates and forms the ions Na+ and Cl-. The anion can be form salts with the other cations presented in the solution. According to the solubility table of the salts, AgCl is a nonsoluble salt, and so, it was expected to form a precipitate. Perhaps, the concentration was not higher enough to do this.
When sodium sulfate (Na2SO4) is added, sodium sulfate dissociates and forms Na+ and SO₄⁻², the sulfate ion can react with the other cations. According to the solubility table, the salt CaSO4 (Ca is from group 2) is nonsoluble, so it will be formed. The net ionic equation represents the ions in solution that reacts:
Na⁺(aq) + SO₄⁻² (aq) + Ca⁺₂(aq) → Na⁺(aq) + CaSO₄(s)
SO₄⁻² (aq) + Ca⁺₂(aq) → CaSO₄(s)
When sodium carbonate (Na2CO3) is added, it dissociates and forms Na+ and CO₃⁻². According to the solubility table, the salt CuCO₃ is nonsoluble and will form a precipitate:
Na⁺(aq) + CO₃⁻²(aq) + Cu⁺²(aq) → Na⁺(aq) + CuCO₃(s)
CO₃⁻²(aq) + Cu⁺²(aq) → CuCO₃(s)
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if a bottle of nail polish remover contains 179 ml of acetone, how much heat would be released by its complete combustion? the density of acetone is 0.788 g/ml .
If a bottle of nail polish remover contains 179 ml of acetone, −4349.7kJ. heat would be released by its complete combustion.
Given Data:
The volume of acetone is 179 mL.
The density of acetone is 0.788 g/mL.
Below is a diagram illustrating how acetone burns.
CH3COCH3 + 4O2 = 3CO2 + 3H2O
The heat released during the given reaction is -1790 kJ/mol. The negative sign represents the release of energy.
The formula to calculate mass from density and volume is shown below.
Mass= Density × Volume
Substitute the values of density and volume of acetone in the above formula.
Mass=0.788g/mol× 179mL=141.052g
The formula to calculate number of moles is as follows.
Number of moles=Mass/ Molarmass
Acetone has a 58.08 g/mol molar mass.
Substitute the values of mass and molar mass of acetone in the above formula.
Number of moles= 141.052g/(58.08g/mol)=2.43mol
The heat that is released from combustion of one mole of acetone is -1790 kJ/mol.
So, the heat that would be released from combustion of 2.43 mole of acetone is
(−1790kJ/mol×2.43mol) that is -4349.7 kJ.
Therefore, the heat that is released by combustion of 179 mL of acetone is
−4349.7kJ.
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Nuclear decay occurs according to first-order kinetics. What is the half-life of polonium-218 if a sample decays from 55. 4 g to 31. 7 g in 2. 50 minutes?.
The kinetics of first order governs nuclear decay. In the event that a sample degrades from 55.4 g - 31.7 g after 3.09 minutes, what is the polonium-218 half-life?
What is the purpose of polonium?Polonium is employed in research and antistatic devices because it is an alpha-emitter. It serves as a dominant male source there in form of a small layer on a steel disc. Eliminating static electricity from processes like rolling wire, paper, and sheet metal.
What polonium mass number is 218?For information pertaining to the periodic table chemical element polonium, please visit its element page. The chemical element of polonium is called polonium-218, and it has a half-life of 3.10 minutes and a relative atomic mass of 218.008966.
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identify the oxidized substance, the reduced substance, the oxidizing agent, and the reducing agent in the redox reaction. cu(s) 2agno3(aq)⟶2ag(s) cu(no3)2(aq) which substance gets oxidized? ag ag no−3 cu2 cu which substance gets reduced? ag no−3 cu2 cu ag what is the oxidizing agent? no−3 cu ag ag cu2 what is the reducing agent? no−3 cu2 ag cu ag
The given redox reaction, Cu(s)+2AgNO3(aq)⟶2Ag(s)+Cu(NO3)2(aq).
The substance gets oxidized = Cu The substance gets reduced = Ag + The oxidizing agent = Ag + The reducing a cu Ag
Reason:
Redox is a type of chemical reaction in which the oxidation states of the substrate change. Oxidation is the loss of electrons or an increase in the oxidation state, while reduction is the gain of electrons or a decrease in the oxidation state.
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a chemist measures the amount of mercury in sediment samples from three areas of a river (the source, the midway point, and the mouth). which is the most reasonable hypothesis for the chemist's experiment?
A chemist counts the quantity of mercury present in sediment samples collected from three different riverbanks (the source, the midway point, and the mouth).
Who is known as a chemist?A scientist who has received training inside the study of chemistry is known as a chemist (from the Greek chm(a) alchemist; replacing chymist from Latin “ alchemist). Chemists look into the composition and characteristics of stuff.
Is a pharmacist a chemist?A pharmacist is a medical professional who helps prepare, controls, formulates, preserves, distributes, and advises and guides the general public on the proper use of medications to achieve maximum results. They are also referred to as chemists (Commonwealth English), druggists (North American, and, archaically, Commonwealth English) and chemists (Commonwealth English).
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what is the molar mass of a 4.80 g sample of gas exerting 0.800 atm of pressure at 295 k in a 7.00 l container?
The molar mass of a 4.80 g sample of gas exerting 0.800 atm of pressure at 295 k in a 7.00 l container is 253.969g/mol.
It is given that the mass of the sample is 4.8g and it exerts a pressure of 0.8atm at 295K in a 7L container. According to the ideal gas law,
PV =nRT
By rearranging this formula we get,
n = PV/RT
On plugging the values of P, V, R and T we get
n = 0.8x7/295
n = 5.6/295
n = 0.0189 moles
The moles of the gas are 0.0189. The molar mass can be computed by,
Molar mass = mass of the gas/moles of the gas
Molar mass = 4.8/0.0189
Molar mass = 253.968g/mol
Therefore, the molar mass of the gas is 253.969g/mol
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name the ions formed by these elements and classify them as anions or cations. a) selenium b) barium c) phosphorus
The selenium ion is represented as Se4+, Barium ion is represented as Ba2+ and Phosphorus occurs as phosphate ion i.e., PO43-.
The chemical species that contains a positive charge is known as cation while the chemical species consisting of a negative ion is known as anion.
Selenium is a metal, therefore is exist as a cation with Se4+ representation having +4 charge. Barium is a metal, thus it exist as a cation with Ba2+ representation having +2 charge while phosphorus always occurs as a phosphate ion i.e., PO43- which is an anion as phosphorus is a non-metal.
Therefore, the representation of the ions are given above.
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The room temperature BCC single-phase solid solution of carbon in iron is known as:
A. Austenite B. Ferrite C. Cementite D. Pearlite
B
The room temperature BCC single-phase solid solution of carbon in iron is known as: B. Ferrite
ferrite is a ceramic-like substance having magnetic characteristics that may be used in many different kinds of electrical equipment. Ferrite are polycrystalline, or made up of many tiny crystals, and are hard, brittle, iron-containing, often gray or black materials.
Temperature is a unit of measurement that may be represented on a variety of scales, including Fahrenheit and Celsius. Temperature shows the direction of the spontaneous movement of heat energy, i.e., from a hotter body (one with a higher temperature) to a colder body (one at a lower temperature).
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Calculate the standard reaction entropy for the decomposition of 1 mol calcite to carbon dioxide gas and solid calcium oxide at 25°c.
Entropy change is typically 160.6 J/K.
ΔH°reaction=∑ΔH°f(reactants)+∑ΔH°f(reactants)
What does a typical entropy mean?The entropy content of one mole of a pure substance at a standard condition of pressure and any desired temperature is known as the standard molar entropy in chemistry. These are frequently (but not always) used as the typical temperature and pressure.
How is the entropy of a reaction calculated?Take an energy reading at a given temperature to calculate entropy. To quantify thermal energy transmitted (q) at a particular temperature, a calorimeter is typically used. Maintain the temperature value mathematically constant by assuming only extremely slight variations in the process's conditions.
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two coordination compounds that have the same ligands arranged differently in space around the central metal ion, but are not mirror images of one another, are called
Geometric isomers are coordination compounds that have two or more of the same atom kinds, numbers, and bond types.
Geometric isomers are two coordination compounds with identical ligands that are not mirror images of one another but are positioned differently in space around the central metal ion. Trans isomers have identical ligands across from each other, whereas isomers with identical ligands adjacent to each other are referred to as cis isomers.
The only compounds with geometric isomerism are square planar and octahedral. Tetrahedral compounds do not exhibit geometric isomerism since each Ligand is positioned in the same way around the centre metal atom or ion in space.
Hence, coordinating substances known as geometric isomers include two or more of the same atom types, numbers, and bond types.
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draw the lewis structure for the polyatomic phosphite anion. be sure to include all resonance structures that satisfy the octet rule.
The structure of the phosphite anion is a "T" shaped structure as it contains three oxygen atoms one with double bond with the phosphate atom.
Anion is a negatively charged ion that attracts the anode in electrolyte solution. The phosphite anion contains three oxygen atoms with one of them having double bond with the phosphate atom.
According to Lewis structure the phosphite anion would be a "T" shaped structure. As we know, Lewis structure gives us the idea of how many electrons are donated or shared in order to form a covalent bond.
Lewis structures, also known as Lewis dot formulas, Lewis dot structures, electron dot structures, or Lewis electron dot structures, are diagrams that show the bonding between atoms of a molecule, as well as the lone pairs of electrons that may exist in the molecule.
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a net magnetic moment is associated with each atom in paramagnetic and ferromagnetic materials. explain why ferromagnetic materials can be permanently magnetized whereas paramagnetic ones cannot
Ferromagnetic materials can be permanently magnetized whereas paramagnetic ones cannot because in ferromagnetic material the electron spin is in the same direction whereas in the paramagnetic material the electrons spin is in all direction.
A net magnetic moment is associated with each of the atom in the paramagnetic and the ferromagnetic materials. the ferromagnetic is permanently magnetized as the in case of ferromagnetic material the electron spin is in same direction. and ferromagnetic material shows strong attractive or repulsive force when ferromagnetic material introduced to the permanent magnet.
In the case of paramagnetic material the electrons spin is in all the direction thats why paramagnetic material cannot be permanently magnetized.
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