The option (a) is correct - directly proportional
What is an dipole?
When two charges are spaced apart, they form a dipole, which consists of oppositely charged pairs of charges with equal magnitudes. When there is a difference in charges, or more precisely when the atoms that make up the molecule have an electric charge, dipoles are present.
What is an charges?
The physical quality of matter—its electric charge—is what causes it to feel a force when exposed to an electromagnetic field. Protons and electrons, the two types of charge carriers, typical carry positive and negative electric charges.
Therefore, option (a) is correct - directly proportional
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which of the following are true of qualitative research? (check all that apply.) multiple select question. it is used to explore more deeply into areas that quantitative research may be too superficial to access. it is used to make accurate predictions about relationships between market factors and behaviors. it is used to obtain preliminary insights into research problems. it is used to validate facts, estimates, and relationships.
it is used to validate facts, estimates, and relationships.
What is accurate in terms of quantitative research?The goal of quantitative research methods is to gather numerical data that can be used to quantify variables. The results of quantitative research are unbiased and conclusive because the data is statistically structured. It employs a grounded theory approach that depends on data collection and methodical analysis.
What distinctions between quantitative and qualitative research are there?In contrast to qualitative research, which deals with words and meanings, quantitative research is concerned with figures and statistics. You can measure variables and test hypotheses systematically using quantitative methods. You can investigate ideas and experiences in greater detail using qualitative methods.
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you have a 10.40 g mixture of table sugar (c12h22o11: 342.39 g/mol) and table salt (nacl: 58.44 g/mol). when this mixture is dissolved in 150. g of water, the freezing point is found to be -2.24 °c. calculate the percent by mass of sugar in the original mixture. (assume the solids dissolve completely; kf (h2o)
15.10% is the percent by mass of sugar in the original mixture.
given;
sugar mass= 10.40 g
nacl mass= 58.44 g
mass% of sugar= 10.40/10.40+58.44
mass% of sugar=10.40÷68.84×100
mass% of sugar=15.10%
Mass conservation is one of the fundamental laws of chemistry. Every time a reaction occurs, the mass of the products entering the reaction and the mass of the products leaving the reaction are the same. The quantity of matter in an object is expressed in terms of mass. Typically, mass is expressed in kilograms (kg) or grams (g) (kg). No matter where in the universe it is or how much gravitational force is exerted on it, mass is a measure of how much matter there is. In contrast to an object's weight, which is a force that depends on gravity, an object's mass is constant regardless of the situation. Your mass on the moon and the earth are the same. You weigh roughly one-sixth as much on the moon as you do on the earth.
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drano uses a mixture of sodium hydroxide and aluminum powder to generate hydrogen gas and heat when placed in a drain. calculate the volume of h2 produced at stp if 3.12 g of al is used. (mole ratio is 3 h2 to 2 al).
The volume of Hydrogen gas is 3.88L
The mass of aluminium = 3.12 g
Molar mass of aluminium = 26.98 g/mol
Calculating the number of moles -
Number of moles = Given Mass/Molar Mass
= 3.12/26.98
= 0.116 mol
Thus,
By Stoichiometry of the reaction:
Two moles of aluminium produce three moles of hydrogen gas. Thus, 0.116 moles of aluminium will produce -
= 3/2 × 0.116
= 0.173 mol
Calculating the volume of hydrogen gas produced by the equation -
PV = nRT
V = nRT/P
Using the standard temperature of gas = 273K
= 0.173 × 0.0821 × 273K/1 atm
= 3.88
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Add curved arrows to the reactant side of the following SN2 reaction to indicate the flow of electrons. Dravw the product species to show the balanced equation, including nonbonding electrons and formal charges Do draw in the leaving group as well as the main organic product, adn show the lone pairs and formal charge on the leaving group.
The statement is incomplete so diagram can't be drawn for curved arrows to the reactant side of the given SN2 reaction to indicate the flow of electrons.
The product species to show the balanced equation, including nonbonding electrons and formal charges and to draw in the leaving group as well as the main organic product, and show the lone pairs and formal charge on the leaving group.
What is lone pairs?In a covalent bond when a pair of valence electron remains unshared with another atom is referred to the Lone pair.
SN2 reaction:SN2 reaction is the type of mechanism in chemical reaction in which one bond is broken and other is done in one step.
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0.02877 g sample of gas occupies 10.0 ml at 289.0 k and 1.10 atm. upon further analysis, the compound is found to be 38.734% c and 61.266% f. what is the molecular formula of the compound? molecular formula: draw the lewis structure of the compound. identify the geometry around each carbon atom. bent tetrahedral linear trigonal pyramidal trigonal planar is this compound polar? the compound is polar. the compound is nonpolar.
Geometry around Carbon atom is Lewis structure
Assuming ideal gas, we calculate the number of moles.
PV = nRT
n = PV / RT
n = (1.10 atm) (10 x 10^-3L) / [(0.08205746 L atm / mol K) (289 K)]
n = 4.64 x 10^-4 mol
So, the molar mass is:
molar mass = 0.02877 grams / 4.64 x 10^-4 mol
molar mass = 62.02 g/mol
The only possible combination is : C2F2
C = 12 * 2 = 24
F = 19 * 2 = 38
24 + 38 = 62 g/mol
So, The molecular formula of C2F2 is 62g/mol
Lewis structure if C2F2 is attached below the answere;
What is molecular formula of compound?
The molecular formula of a molecular compound is a chemical formula that shows the number of different atoms present in a molecule. For example, in CO₂, the subscript under oxygen shows that there are two atoms of oxygen present, whereas the lack of subscript under carbon shows it has only one atom of carbon present.
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l cells are a particular type of electrochemical cell that require a constant source of chemical fuels, or reactants, during operation. one of the most common types of fuel cells is the alkaline fuel cell, which uses hydrogen and oxygen as reactants. what species are formed at the anode of the alkaline fuel cell? h2 o2 e− oh− h2o h what species are formed at the cathode of the alkaline fuel cell? h2o e− oh− h2 h o2
Water molecules are the species that also are created on this end of the cell. The total reaction is referred to as a redox reaction.
Explain what electrochemical means.The research of the correlation of electrical electricity and chemical reactions is the focus of the branch of chemistry known as electrochemistry. Oxidation process are those in which electric currents are either generated or received.
What are some electrochemical examples?The typical 1.5-volt cell, which powers numerous electrical devices like TV remote controls and clocks, is an illustration of an electrochemical cell. Copper ions or pv cells are those that may produce an electric current as a consequence of chemical reactions taking place inside of them.
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an unknown amount of gas occupies 30.0 l at 2.1 atm and 298 k. how many moles does the sample contain? what is the mass if the gas is helium? what is the mass if the gas is argon?
The sample contains number of moles of gas is 0.39 mol. The mass of the helium is 1.56 g.
Given,
Volume of the gas = 30L
Pressure = 2.1atm
Temperature = 298K
R = 0.0821 L.atm/(mol.K)
To find:
Number of moles = ?
Mass of helium = ?
Solution:
To find the mass of helium in the container, use the expression below:
Mass of helium = number of moles x molar mass
Using the ideal gas equation;
PV = nRT
Where,
P is the pressure
V is the volume
n is the number of mole
R is the gas constant
T is the temperature
Substitute the values and solve for n;
2.1 x 30 = n x 0.0821 x 298
⇒ n = 24.4658 / 63
⇒ n = 0.39
Now,
molar mass of He = 4g/mol
Now, solve;
Mass of helium = 4 x 0.39 = 1.56g
Hence, the mass of the helium is 1.56 g.
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Which equation describes a combustion reaction?
Responses
H2SO3→H2O+SO2
C10H8+12O2→10CO2+4H2O
NaHCO3+CH3COOH(aq)→H2CO3+NaCH3COO
4Al(s)+3O2(g)→2Al2O3(s)
The equation that reflects combustion is the equation in Option B.
What is a combustion reaction?We know that a combustion reaction has to do with a kind of reaction that involves the burning of a substance in oxygen. As such, when the substance is burnt we have carbon dioxide and water produced.
In this case, we have to look at the equations as they have been written and then try to know which of them has to do with the burning of a substance in oxygen and this would be the Option B. It is the burning of an organic compound.
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1. were there any compounds that you could not positively id based on the information you had available to you? explain if needed.
In general, I was able to ID most of the compounds based on the materials and the images provided but not positively 100% because there are compounds that do not show up using only the NMR spectroscopy.
A compound is a substance made up of two or more components. Water, carbon dioxide, and table salt are examples of compounds.
In chemistry, a compound is a substance composed of two or more different chemical elements combined in a definite ratio. When elements come together, they react with each other to form unbreakable chemical bonds.
These bonds are formed when electrons are shared or exchanged between atoms.
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a sample in a spectrophotometer gives a percent transmittance of 37.5 %. what is the absorbance of the sample?
A sample in a spectrophotometer gives a percent transmittance of 37.5 %. the absorbance of the sample is 0.425
Given that :
a percent transmittance = 37.5 %
The absorbance of the sample expression is given as :
Absorbance = - log (T)
where T = transmittance
Absorbance = - log ( percent transmittance / 100)
Absorbance = - log ( 37.5 / 100 )
Absorbance = - log (0.375 )
Absorbance = - ( -0.425 )
Absorbance = 0.425
Thus, the absorbance for the percent transmittance of 37.5 % is 0.425. the percent transmittance in the spectrophotometer is the percentage of light that passes through solution.
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Give another example of electrical energy being transferred into light
Answer: lightbulb, lamp, nightlight
Explanation:
malonyl-coa is an intermediate in fatty acid synthesis. it also regulates fatty acid metabolism. which of the molecules regulate the enzyme that catalyzes malonyl‑coa synthesis?
Malonyl CoA regulates a variety of enzymes, including fatty acid synthase, acetyl-CoA carboxylase, and carnitine palmitoyltransferase I.
Malonyl CoA is an important regulatory molecule that is involved in the control of fatty acid synthesis. It is the precursor molecule to acetyl CoA and is produced in the cytosol of cells from acetyl CoA by the enzyme acetyl-CoA carboxylase. Malonyl CoA then serves as a substrate for a variety of enzymes, which are regulated by their levels.
One of the enzymes that Malonyl CoA regulates is fatty acid synthase (FAS). FAS catalyzes the conversion of acetyl CoA and malonyl CoA into long-chain fatty acids. The enzyme is activated when Malonyl CoA binds to the active site, which induces a conformational change in the enzyme that increases the affinity of the enzyme for its substrate.
Another enzyme that Malonyl CoA regulates is acetyl-CoA carboxylase (ACC). ACC catalyzes the carboxylation of acetyl CoA to form malonyl CoA. This enzyme is regulated by Malonyl CoA, as the presence of Malonyl CoA in the active site of the enzyme inhibits its activity. This serves to prevent the production of excessive amounts of Malonyl CoA, which could otherwise lead to excessive fatty acid synthesis.
Finally, Malonyl CoA also regulates the enzyme carnitine palmitoyltransferase I (CPT-I). CPT-I is responsible for the transport of long-chain fatty acids across the mitochondrial membrane, a process that is necessary for the oxidation of fatty acids. Malonyl CoA binds to CPT-I, inhibiting its activity and thus preventing fatty acid oxidation. This serves to maintain the levels of Malonyl CoA in the cytosol, ensuring that it can be used for fatty acid synthesis.
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Suppose you added some solid potassium nitrate (KNO3) to a saturated solution of KNO3 at 20OC and then warmed the mixture to 40oC. What would happen to the added KNO3? What would happened to if you repeated the procedure, except with sodium chloride (NaCl)?
The solubility of the potassium nitrate will increase as we increase the temperature because increases the kinetic energy of solute particles. More KNO₃ will dissolve in the solution and makes it unsaturated.
What is solubility?Solubility can be described as the maximum amount of Solute that can dissolve in a known quantity of solvent at a particular temperature. By changing the temperature we can increase the solubility of a solute. Sparingly soluble solids or liquids can be completely liquified by raising the temperature.
Solid solubility depends on the nature of the solute and the solvent. Substances such as sugar, common salt (NaCl), etc dissolve in water while substances such as naphthalene do not dissolve in water.
The solubility of potassium nitrate KNO₃ increases with an increase the temperature but the increasing temperature of NaCl solution does not show much change in the solubility of NaCl.
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Which one of the following substances is more likely to dissolve in benzene (c6h6)?.
Carbon tetra chloride (CCl4) substances is more likely to dissolve in benzene (c6h6)
The chemical name for carbon tetrachloride, sometimes referred to as tetrachloromethane and recognized by the IUPAC, carbon tet in the cleaning business, Halon-104 in firefighting, and Refrigerant-10 in HVACR, is CCl4. It is an organic compound. It has an indistinct color and a just perceptible "sweet" odor. At lower temperatures, it is almost incombustible. Prior to being phased out because to environmental and safety concerns, it was frequently used in fire extinguishers, as a predecessor to refrigerants, and as a cleaning agent. The central nervous system can be impacted as well as the liver and kidneys when exposed to high amounts of carbon tetrachloride, particularly its vapor. An extended exposure risk can be fatal.
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Which of the following substances are soluble in water? KCl, Hexane (CH 3CH 2CH 2CH 2CH 2CH 3), Vitamin A (C 20H 30O), Methanol (CH 3OH)
Methanol and KCl are soluble in water. The maximum amount of a chemical that will dissolve in a given amount of solvent at a given temperature is referred to as its solubility.
N-hexane smells like petroleum and is a clear, colourless liquid. -9 °F flash points.
As a result of hydrogen bonds between methanol and water molecules, methanol is soluble in water.
Water readily dissolves KCl.
Ionic in nature, KCl can only dissolve in polar solvents like water. The adage "like dissolves like" can be used to generalise this. Because benzene is a nonpolar solvent, KCl cannot be dissolved in it.
Because they are soluble in organic solvents and are absorbed and transported similarly to fats, vitamins A, D, E, and K are referred to as fat-soluble vitamins.
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what volume (in ml) of water must you add to 50.0 ml of a 0.600 m libr solution to produce a 0.145 m solution? assume the volumes are additive.
To neutralize 23.5 mL of a 0.145 M barium hydroxide solution, 23.9 mL of a 0.284 M hydrochloric acid solution is needed.
What does barium hydroxide serve?
Barium hydroxide is used to titrate weak acids, especially organic acids, in analytical chemistry. In contrast to the alkali hydroxides, barium carbonate creates clear, carbonate-free aqueous solutions because it is insoluble in water.
Acidity of barium hydroxide
When heated to 800 °C, barium hydroxide turns into barium oxide. Barium carbonate is produced when carbon dioxide reacts with it. Its strong base causes its extremely alkaline aqueous solution to go through neutralization reactions with acids.
Briefing:
The equation is given as:
Ba(OH)₂ + 2HCl ------> BaCl₂ + 2H₂O
from the equation it is clear that :
1mole of Ba(OH)₂ = 1 mole of HCl
number of moles of Ba(OH)₂ = volume × Molarity
= 0.0235 × 0.145
= 0.0034 mol
Therefore, number of moles of HCl = 2× 0.0034 mol = 0.0068 mol
volue of HCl = moles / Molarity
= 0.0068 / 0.284
= 0.0239 L = 23.9 mL
Thus, The volume of a 0.284 M hydrochloric acid solution is required to neutralize 23.5 mL of a 0.145 M barium hydroxide solution is 23.9 mL.
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the hybridization of the oxygen atom labeled x in the structure below is . the hybridization of the oxygen atom labeled x in the structure below is . sp sp2 sp3 sp3d sp3d2
The hybridization of the oxygen atom labeled x in the structure below is sp2.
One s orbital and two p orbitals combine to generate three sp2 orbitals, each of which has 33% s character and 67% p character. This process is known as sp2 hybridization. When three groups of electrons surround an atom, this form of hybridization is necessary.
One electron in the s orbital is promoted to one of the 2p atomic orbitals as part of the sp2 hybridization, which is the mixing of one s and two p atomic orbitals. These two atomic orbitals combine to form three new hybrid orbitals that are equally energetic. The energy of the hybrid orbitals is higher than the energy of the s orbital, lower than the energy of the p orbitals, but closer to the energy of the p orbitals. Trigonal structures are produced by the newly generated hybrid orbitals, giving the molecule a 120-degree molecular geometry.
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Zinc is most readily found in protein-rich foods such as shellfish, meats, poultry, and dairy products. Vegetarian sources such as legumes and whole grains offer zinc; however, their ______A. OxylateB PhytateC fiberD. Nitrigen
Answer: phytate i believe is the answer
water was added to destroy any remaining acetic anhydride. what is the produt of water and acetic anhydride?
The product of water and acetic anhydride is acetic acid.
What is acetic acid?
Acetic acid is also known as ethanoic acid, ethylic acid, vinegar acid, and methane carboxylic acid; it has the chemical formula of CH3COOH. It is the second simplest carboxylic acid.
Which chemical reaction involves the reaction of water and acetic anhydride?
Salicylic acid is reacted with an excess of acetic anhydride to produce aspirin. As a catalyst, a small amount of a strong acid is utilized, which speeds up the reaction. With the addition of water, the excess acetic anhydride will be quenched (reacted).
In this reaction, One equivalent of salicylic acid reacts with one equivalent of acetic anhydride to form aspirin. The reaction mixture still contains the residual acetic anhydride. Acetic anhydride is easily hydrolyzed during the work-up process to create acetic acid, which is freely soluble in water. The filtrate from the separation of crude aspirin will contain the leftover acetic anhydride that has been hydrolyzed to acetic acid.
The product of water and acetic anhydride is acetic acid.
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what best describes what happens when an acid such as hcl is mixed with water? what best describes what happens when an acid such as hcl is mixed with water? the proton chemically bonded to the chlorine is transferred to a water molecule and forms a chloride ion and a hydronium ion. a proton from the chlorine nucleus is ejected and captured by a water molecule to form a negatively charged hcl and a new hydronium ion. hcl is not an acid. a hydroxide ion from the water is transferred to the hcl molecule to form a proton and hydronium ion. none of the above
A) The proton chemically bonded to the chlorine is transferred to a water molecule and forms a chloride ion and a hydronium ion.
Proton include the H+ ion or the hydrogen atom's nucleus. Regardless of the isotope, each hydrogen atom has one proton, each helium atom has two, each lithium atom has three, and so on. 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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Barium-131 is used in the detection of bone tumors. The half-life of barium-131 is approximately 12 days. How long will it take for the radiation level of barium-131 to drop to 1/4 of its original level?.
Barium-131's radiation level won't reach 1/4 of its initial level for 24 hours.
ln[A] t = -kt + ln[A] 0 is the integrated rate rule for the first-order reaction A's products.
A straight line is produced when the natural log of [A] is plotted as a function of time since this equation has the form y = mx + b.
How is the length of a half-life determined?
The amount of time needed for the reactant concentration to drop to half its initial value is known as the half-life of a reaction. A first-order reaction's half-life is a constant that is correlated with its rate constant:
t 1/2 = 0.693/k.
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Being Aware Methane is much more powerful than carbon dioxide when it comes to holding heat and elevating temperatures. An unchecked increase in methane in the atmosphere could lead to much more rapid climate change. What changes can people make to decrease emissions in the sectors that produce the most methane?
The changes that people can make to decrease emissions in the sectors that produce the most methane is to reduce the drilling for petroleum.
What is methane gas?Methane is a hydrocarbon gas that is produced from the decomposition of plant matter in the absence of air.
Methane is a major constituent of natural gas that occurs in combination with petroleum.
Hence, methane gas is produced during the drilling of petroleum.
The release of methane gas into the atmosphere poses a major threat to the environment due to its effect on global warming. This is because methane is much more powerful than carbon dioxide when it comes to holding heat and elevating temperatures.
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Three blocks are shown: Three blocks are shown. Block A has mass 3 kilograms, length 6 centimeters, height 4 centimeters, and width 2 centimeters. Block B has mass 1 kilograms, length 6 centimeters, height 2 centimeters, and width 4 centimeters. Block C has mass 2 kilograms, length 2 centimeters, height 6 centimeters, and width 4 centimeters. Which statement is correct? Block A has the greatest density. Block B has the greatest density. The density of Block A is equal to the density of Block B. The density of Block B is equal to the density of Block C
Answer:
Block A has the greatest density.
Explanation:
Three blocks are shown: Three blocks are shown.
Block A has mass 3 kilograms, length 6 centimeters, height 4 centimeters, and width 2 centimeters.
Block B has mass 1 kilograms, length 6 centimeters, height 2 centimeters, and width 4 centimeters.
Block C has mass 2 kilograms, length 2 centimeters, height 6 centimeters, and width 4 centimeters.
Which statement is correct?
- Block A has the greatest density.
- Block B has the greatest density.
- The density of Block A is equal to the density of Block B.
- The density of Block B is equal to the density of Block C
n alternating copolymer is known to have a number-average molecular weight of 250,000 g/mol and a degree of polymerization of 3420. if one of the repeat units is styrene, which of ethylene, propylene, tetrafluoroethylene, and vinyl chloride is the other repeat unit? why?
Chain fraction is styrene and unknown repeat units in an alternating copolymer, followed by each type of repeat unit. If the other is Styrene, a repeat unit of an alternating copolymer forms.
With the chemical formula C6H5CH=CH2, styrene is an organic substance. Although older samples may appear yellowish, this benzene derivative is an oily, white liquid. Although large concentrations have a less savoury flavour , the chemical readily evaporates and has a sweet smell of styrene. A copolymer is a polymer produced from more than one type of monomer in polymer science. Copolymerization is the process by which monomers are polymerized into copolymers. Bipolymers are the name given to copolymers created through the copolymerization of two monomer types. The formula for m is as follows: m = Mn / Dp m = 250000 / 3420 = 73.09g/mol.
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what structural feature seems to distinguish the molecules in which the real bond angle is less than the model bond angle?
The bond angle is impacted by the presence of a lone pair of electrons at the core atom.
Why do some compounds have bond angles that deviate from expectations?
Several factors can lead to deviations from the optimum bond angles of a molecular form. The size of the involved atoms, the number of lone pairs, the number of bonds, the size of the groups attached to the central atom, and the environment in which the molecule is situated are just a few of the factors to consider.
What component(s) influences bond length and bond angle?
The length of the bond depends on how many electrons are bonded (the bond order). further bonds ordered,
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Enter a chemical equation for HClO4(aq) showing how it is an acid or a base according to the Arrhenius definition. Consider that strong acids and bases dissociate completely. Express your answer as a chemical equation. Identify all of the phases in your answer. Enter a chemical equation for HBr(aq) showing how it is an acid or a base according to the Arrhenius definition. Consider that strong acids and bases dissociate completely.Express your answer as a chemical equation. Identify all of the phases in your answer. Enter a chemical equation for Ca(OH)2(aq) showing how it is an acid or a base according to the Arrhenius definition. Consider that strong acids and bases dissociate completely.Express your answer as a chemical equation. Identify all of the phases in your answer.
According to Arrhenius definition a compound is an acid when, in aqueous solution it can releases protons. and a compound is a base when, in aqueous solutions it can releases hydroxides anions.
According to Arrhenius, the acids are the hydrogen-containing compounds which give H+ ions or protons on dissociation in water and bases are the hydroxide compounds which give OH− ions on dissociation in water.
Arrhenius theory is only applicable only in the aqueous solution, for example, according to the Arrhenius theory, HCl is an acid in the aqueous solution but not in benzene, even though it donates H + ion to the benzene. Also, under Arrhenius’s definition, the solution of sodium amide in liquid ammonia is not alkaline, even though amide ion deprotonates the ammonia.
So, for the acidic and basic properties, the presence of water is necessary.
This theory does not explain acidic and basic character of substances in non-aqueous solvents.
In case of HClO4 when it is subjected to dissociation it produces hydronium ion in the solution and hence it can be termed as an acid.
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na2co3 --> h2o (gas) co2 (gas) na2co3 (solid) how many l of gas are produced if 1.00 g. of nahco3 decomposes at 29 degrees c and 769 torr?
0.375 L volume of gas are produced if 1.00 g. of nahco3 decomposes at 29 degrees c and 769 torr
moles=0.011
p=769 torr
v=?
temperature=302K
PV=nRT
V=nRT/P
V=0.11×8.3×302÷769
V=0.375 L
The volume of an object in three dimensions is the area occupied within its boundaries. It is referred to as the object's capacity on occasion. The amount required to fill an object can be determined by finding its volume, for example, how much water is required to fill a bottle, aquarium, or water tank.
The most fundamental and frequent form of a three-dimensional shape is a sphere. We frequently encounter spheres in the form of balls, globes, decorative lights, oranges, etc.
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A metal cools from an initial temperature of 225 oc to 25 oc and releases 160 j of heat energy. If the mass of the metal is 5. 0 g, what is its specific heat capacity?.
The answer to the question is that a metals cools from 225°C to 25°C while releasing 160 j of thermal energy. The metal's specific heat becomes c = 0.16 J/g°c if its mass is 5.0 g.
Describe metal.A metal is a substance that exhibits a shiny appearance when freshly processed, polished, or shattered, and transmits both heat and electricity rather well.
Briefing:Given:
T₁ = 225°C
T₂ = 25°C
q = -160 J
m = 5.0 g
As we know,
q = mcΔT
Now,
-160 = 5*c*(T₂-T₁)
-160 = 5*c*(25-225)
c = -160/5(-200)
c = 0.16 J/g°c
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2. which pigments did you separate out when you used chromatography. which pigments were more soluble in the solvent?
After doing the paper chromatography the pigments are separated at different levels, these are carotene, green chlorophyll etc.
The lipstick obtained from the bad scene is subjected to paper chromatography and a chromatogram is then obtained. Lipstick is having many coloured pigments as the active ingredients. So this active ingredients separate at different rate depending upon its partition coefficient. The obtained chromatogram is considered as standard and the it's RF values are calculated. Rf values are nothing but the dividing the distance travelled by the solute by the distance travelled by solvent front. The obtained are values are then noted.
The plants consist of different coloured pigments. The primary function of the colour pigments is to absorb maximum frequencies of light and also they can reflect the same. The pigments play their role during the process of of photosynthesis which requires the presence of sunlight. The required amount of light is absorbed by this colour pigments typically the green chlorophyll and several other pigments. These coloured pigments are known as the biological pigments.
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Use the information and examples provided in the exploration and the values recorded in data table 1 from step 8 to determine how many moles of na2co3 are necessary to reach stoichiometric quantities. From that calculation, determine how many grams of na2co3 are necessary to reach stoichiometric quantities. Record both values in data table 1.
0.0102 moles Na₂CO₃ is 1.08g of Na₂CO₃ are necessaries .
Define Stoichiometry .
The quantitative study of the reactants and products involved in a chemical reaction .
What is a mole ?
A standard scientific unit for measuring large quantities of very small entities such as atoms, molecules, or other specified particles.
How to calculate the molecular weight of a given compound ?
Count the number of atoms of each element, and then multiply that number by the element's atomic weight.
Based on the reaction :
CaCl₂ + Na₂CO₃ → 2NaCl + CaCO₃
1 mole of CaCl₂ reacts per mole of Na₂CO₃
Further we are suppose to calculate number of moles of CaCl2•2H2O present in 1.50 g.
To solve this question we must find the moles of CaCl2•2H2O using its molar mass (147.0146g/mol).
No. of moles = Moles CaCl₂ = Moles of Na₂CO₃ necessaries to reach stoichiometric quantities.
Then find then the mass we must use molar mass of Na₂CO₃ (105.99g/mol):
Moles CaCl₂.2H₂O:
1.50g * (1mol / 147.0146g) = 0.0102 moles CaCl₂.2H₂O = 0.0102moles CaCl₂
Moles Na₂CO₃:
0.0102 moles Na₂CO₃
Mass Na₂CO₃:
0.0102 moles * (105.99g / mol) =
1.08g of Na₂CO₃ are present
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