The density of the white crystal is 4.48 g/cm³.
What is Density?
Density is defined as the measure of mass per unit volume of a substance, where the measure of a pure substance is proportional to its mass concentration. Densities are the measure of relative compactness whose definition of this measure can be expressed as mass, m, in a particular volume, v.
ρ = m/V
where, ρ = density, kg/m3, or g/(cm)3
m = mass, in kg or g
V = volume, in m3 or (cm)3
For above given information,
Mass of white crystal = 51.00g
Volume of water = 50.0 mL
Volume of water + white crystal = 61.4 mL
First of all we will calculate the volume of white crystal.
Volume of white crystal= (volume of water + white crystal) - Volume of water
Volume of white crystal= 61.4 mL - 50.0 mL
Volume of white crystal= 11.4 mL
Density of white crystal:
d = m/v
d = 51.00 g / 11.4 mL
d = 4.48 g/cm³ (i.e. 1mL = 1 cm³ )
Thus, the density of the white crystal is 4.48 g/cm³.
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Dichloromethane (CH₂Cl₂) is a non-polar organic solvent that is immiscible with water. A
25.00 ml sample has a mass of 33.13 g at 25° C. You need exactly 252.5 ml of
dichloromethane for an experiment but can't find any volumetric glassware around the lab.
What mass (grams) should you weigh out to give you the required volume at 25° C. (Hint:
Determine the density of dichloromethane) Round to one decimal place.
The mass of Dichloromethane used in the above reaction has a similar density throughout the reaction.
What is density?The density and mass concentration of a pure substance is numerically equivalent. Density can affect buoyancy, purity, and packing. Varied materials typically have different densities. At normal temperatures and pressures, osmium and iridium have the highest densities of any known elements.
mass is occasionally substituted by the dimensionless quantity "relative density" or "specific gravity," i.e. the ratio of the material's density to that of a standard material, typically water, to make density comparisons across different systems of units easier. In other words, if a substance's relative density is less than one in relation to water, it floats.
Temperature and pressure affect a substance's density.
We know that density will be the same throughout mixing.
Hence, density = mass/ volume
now comparing density for both the condition we get
33.13 / 25= mass / 252.5
Mass = 33461 g
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for each of the following compounds, draw in all h atoms, label each unique h atom(s) that would give a distinct signal in 1h nmr (e.g. ha, hb, etc.), then indicate the expected multiplicity of signals from each proton signal.
When a proton is coupled to two different neighboring proton sets with identical or very close coupling constants.
Define unique atoms?
The atomic number (Z) of an element is the number of protons in the nucleus of each atom of that element. This means that the number of protons is the characteristic which makes each element unique compared to all other elements.Carbon atoms are unique because they can bond together to form very long, durable chains that can have branches or rings of various sizes and often contain thousands of carbon atoms. Silicon and a few other elements can form similar chains; but they are generally shorter, and much less durable.One chemist, John Dalton, suggested that these elements were made up of atoms and that the atoms of an element are all the same. This simple model could explain the millions of different materials around us. There are more than 109 different types of atom - one for each element.To learn more about atoms refers to:
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which of the following will not interfere with the reagent strip test for leukocytes? group of answer choices formaldehyde nitrite
Ascorbic acid will not interfere with the reagent strip test for leukocytes.
What is ascorbic acid?Ascorbic acid, often known as vitamin C, is an organic molecule that occurs naturally. It is a water-soluble vitamin that is necessary for the immune system to operate properly, for the skin to produce collagen, and for the body to absorb iron.
Why ascorbic acid does not interfere with reagent strip test for leukocytes?Because ascorbic acid cannot be detected by the test. Leukocyte reagent strip tests often involve the use of a particular chemical reagent, such as nitrofurantoin or esculin, which reacts with the enzymes contained in leukocytes to generate a noticeable color shift.
Ascorbic acid does not react with the reagent used in the test because it does not share the same chemical characteristics as leukocytes.
Which of the following factors will not interfere with the reagent strip test for leukocytes?
A) ascorbic acid
B) formaldehyde
C) nitrite
D) urinary protein level of 500 mg/dL
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How many moles of NaCl are there in 40.3 g of sodium chloride?
Please answer all the questions in the picture below
Thank you
Answer:
58.44277 gram
Explanation:
Help with beers law please I will rate brainliest
Answer:
Beer's law (sometimes called the Beer-Lambert law) states that the absorbance is proportional to the path length, b, through the sample and the concentration of the absorbing species, c: A α b · c. The proportionality constant is sometimes given the symbol a, giving Beer's law an alphabetic look: A = a · b · c.
Explanation:
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What is the density If Length = 20.8cm, Width = 5.3cm, Height = 4.4cm,
and Mass = 287.57g?
The density would be 0.5929 g/cm3.
What is density?The density of an object is the ratio of the mass of the object to its volume.
This can be expressed mathematically as: Density = mass/volume
In this case, the dimension of the object is 20.8 cm x 5.3 cm x 4.4 cm. Thus, the volume of the object would be:
20.8 x 5.3 x 4.4 = 485.056 cm3
The mass of the object is given as 287.57 g.
Thus, density of the object = 287.57/485.056 =
In other words, the density of the object would be 0.5929 g/cm3
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propose five combinations of aqueous ionic reagents that likely would form a precipitate when they are mixed
propose five combinations of aqueous ionic reagents that likely would form a precipitate when they are mixed NaCl + AgNO3 (aq) (aq) CaCl2 (aq) + Na3PO4 (aq) CuSO4 (aq).
+ Zn(NO3)2 BaCl2 (aq) + Na2SO4 (aq) (aq) KI + Pb(NO3)2 (aq) (aq) Silver chloride (AgCl) precipitates from sodium chloride (NaCl) and silver nitrate (AgNO3). Lead (II) nitrate (Pb(NO3)2) and potassium iodide (KI) combine to generate lead (II) iodide (PbI2). Copper (II) sulfate (CuSO4) and sodium hydroxide (NaOH) combine to generate copper (II) hydroxide (Cu(OH)2).Aluminum chloride (AlCl3) reacts with sodium hydroxide (NaOH) to generate aluminum hydroxide (Al(OH)3). Barium chloride (BaCl2) and sodium sulfate (Na2SO4) react to generate barium sulfate (BaSO4).and silver nitrate (AgNO3). Lead (II) nitrate (Pb(NO3)2) and potassium iodide (KI) combine to generate lead (II) iodide (PbI2). Copper (II) sulfate (CuSO4) and sodium hydroxide (NaOH) combine to generate copper (II) hydroxide .
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How many carbon atoms are in the following compound: Barium Carbonate?
The chemical compound Barium Carbonate (BaCO3) is composed of one Barium atom (Ba), one Carbon atom (C) and three Oxygen atoms (O3). Therefore, the number of carbon atoms in Barium Carbonate is 1.
The compound Barium Carbonate has 1 carbon atom.
The chemical formula for Barium Carbonate is BaCO3, which means it contains 1 atom of Barium (Ba), 1 atom of Carbon (C), and 3 atoms of Oxygen (O). Therefore, the compound Barium Carbonate has 1 carbon atom.
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The equilibrium constant for the reaction represented by the equation below is greater than 1.0. Which of the following gives the correct relative strengths of the acids and bases in the reaction?H2PO4− + HBO32− ⇄ HPO42− + H2BO3−Acids BasesA.H2PO4− > H2BO3− and HBO32− > HPO42− B.H2BO3− > H2PO4− and HBO32¯ > HPO42− C.H2PO4− > H2BO3− and HPO42− > HBO32− D.H2BO3− > H2PO4− and HPO42− > HBO32− E.H2PO4− = H2BO3− and HPO42− = HBO32−
Giving the right relative importance of the bases and acids used in the reaction is H2PO4 > H2BO3 and HBO32 > HPO42.
What are acids, exactly?A chemical that produces salts and release hydronium ions into water when it reacts with any of these metals. Acids have one sour taste and give some colours a reddish tint. Chemicals taste acidic whenever dissolved in water and conduct electricity, and combine with metals to produce oxygen and hydrogen. Litmus is one indicator compound that can be used to identify acids. Acids cause the blue litmus material to turn red. One type of acid is sodium hydroxide.
Which one has the strongest acid?For example, pure sulfuric acid has a shocking pH of -12 while nitric acid has a pH of 1.08 and bleach has a pH of 1.6. So, the strongest "regular" acid you will encounter is weakly acidic.
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02 Question (6 points) 1st attempt IH See Periodic Table Name and define the four quantum numbers that identify the highest energy electron in a francium; Fr, atomic orbital; Symbol Value Principal quantum number Ancular momentum quantum number Magnetic quantum number Spin magnetic quantum number
The four quantum numbers that identify the highest energy electron in a francium, fr, atomic orbital are n, ℓ, m, and s.
Which four quantum numbers are there?The energy levels of an atom are connected by a set of quantum numbers. The entire and singular quantum state of a single electron in an atom, also known as its wave function or orbital, is described and explained by the four quantum numbers, n, l, m, and s. Accordingly, the four quantum numbers are n, l, m, and s.
The quantum number is used to define the location of electrons, and an orbital is a place inside the atom where an electron can be found. The quantum number of the shell orbitals of an atom depends on the number of electron shells it contains.
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Briefly explain why ethanol (C2H6O), an alcohol has a much higher boiling point than dimethyl ether (C2H60).
Ethanol (C2H6O), an alcohol has a much higher boiling point than dimethyl ether (C2H60) because hydrogen bonds found in the former are typically much stronger attractions than ordinary dipole moments in the latter.
What is Boiling point?
This is referred to as the temperature at which the vapor pressure of a liquid equals the pressure surrounding the liquid and the liquid changes into a vapor.
Ethanol (C2H6O), an alcohol has a much higher boiling point than dimethyl ether (C2H60) because hydrogen bonds have a stronger attraction which makes it more difficult for the atoms to be broken down hence the reason why the boiling point will be higher in this scenario.
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how many moles are in 559 grams of Mg(CIO3)2
The number of moles which are in 559 grams of Mg(CIO3)2 is 2.92mol.
What is Mole?This is referred to as the unit of the quantity amount of substance and is also defined as a measure of how many elementary entities of a given substance are in an object or sample.
The formula is mole = mass/molar mass.
Mg(CIO3)2 has a molar mass of 191.20g/mol
Mole = 599/191.20 = 2.92mol.
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Why is there no reaction if you remove mercury oxide,HgO from the reaction?
The reaction stops because the reaction is a decomposition reaction.
What is a reaction?We have to note that there is a reaction when there is change of the reactants that are in the system to the products. We have to note that in this case. we have the decomposition of the mercury oxide.
Since it is a decomposition reaction, we can see that there is a break down of the mercury oxide to give rise to the oxygen and to the mercury as such if we remove the mercury oxide the reaction stops.
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zn(s) is used to reduce other compounds in chemical reactions. if a chemist needs a substance that is more effective in its reducing ability, which of the following species would be the best choice? A. Na B. H^+ C. K^+ D. Cl^-
The species would be the best choice if a chemist needs a substance that is more effective in its reducing ability = Na (option A)
An element's reducing ability is defined as its ability to lose electrons. It assists the other element in gaining electrons and thus functions as a reducing agent.
The substance with the highest positive reduction potential is always reduced and undergoes a reduction reaction. Alternatively, the substance with the highest negative reduction potential will always be oxidized and undergo an oxidation reaction.
Elemental sodium is a good reducing agent because it belongs to group I, and elements in group I have one electron in their valence sheet. As a result, they readily lose 1 electron to achieve noble gas configuration, undergoing oxidation (i.e. electron loss) and acting as a good reducing agent.
The standard reduction potential of sodium will be:
Na ⇒ Na⁺ + e⁻
E⁰ Na⁺ / Na = -2.71 V
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2Cl2 + O2 → 2Cl2O
How many of each type of bond are present in the reactants?
How many of each type of bond are present in the product?
Use the Bond Energy Table to find the total change in bond energy. (187 kJ/mol)
Is this reaction endothermic or exothermic? How do you know?
Answer:
endothermic reaction; need more info on the reactants to answer the other questions
Explanation:
Given the change in bond energy of 187 kJ/mol, you can determine whether the reaction is endothermic or exothermic. If the bond energy is positive, the reaction is endothermic, meaning it absorbs energy. If the bond energy is negative, the reaction is exothermic, meaning it releases energy. In this case, the bond energy is positive so it's an endothermic reaction.
Identify the type of friction acting in each scenairo
A surfer rides an ocean wave is fluid friction
A bowling ball travels down a bowling lane rolling friction
A baseball flies through the air is air resistance
A hose rests on the edge of a truck is static friction.
What is friction?Friction is described as the force resisting the relative motion of solid surfaces, fluid layers, and material elements sliding against each other.
Static friction is that force that keeps an object at rest.
It is that friction experienced when individuals try to move a stationary object on a surface, without actually triggering any relative motion between the body and the surface on which it is on.
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Complete question:
dentify the type of friction acting in each scenario.
A surfer rides an ocean wave.
A bowling ball travels down a bowling lane.
A baseball flies through the air.
A hose rests on the edge of a truck.
OPTIONS:
air resistance
fluid
rolling
sliding
static
What is the formula for iron(II) phosphide?
(Fe2P)
The formula for iron(II) phosphide is Fe₂P.
What is a Chemical formula?This is a term used in chemistry which is used to identify each constituent element by its chemical symbol and indicates the proportionate number of atoms of each element.
In this scenario, the chemical compound of iron and phosphorus, with a formula of Fe₂P and it has a physical appearance is grey, hexagonal needles which is formed from the reaction between the elements Iron and phosphorus at an elevated or high temperature and the product which is formed is a phosphorylated molecule thereby making it the most correct choice.
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When converting between metric units, use the prefixes to help you determine the magnitude of a value. The prefix k indicates kilo, 1000g = 1kg.
A 25.0 kg iron weightlifting plate has a volume of 3180 cm^3 . What is the density of the iron plate in g/cm^3?
Express your answer in grams per cubic centimeter to three significant figures.
The density of the iron plate in g/cm³, given that it has a mass of 25.0 Kg and a volume of 3180 cm³ is 7.86 g/cm³
How do I determine the density of the iron plate?The density of a material is defined as the mass of the material per unit volume of the material. This is written as:
Density = mass / volume
Using the above formula, we can obtain the density of the iron plate as illustrated below:
Mass of iron plate = 25 Kg = 25 × 1000 = 25000 gVolume of iron plate = 3180 cm³Density of iron plate = ?Density = mass / volume
Density of iron plate = 25000 / 3180
Density of iron plate = 7.86 g/cm³
Thus, from the above calculation, we can conclude that the density of the iron plate is 7.86 g/cm³
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FILL IN THE BLANK. A __ reaction is a process in which a covalent or ionic bond is broken or formed.
A chemical reaction is a process in which a covalent or ionic bond is broken or formed.
A chemical reaction is a process that converts one or more compounds, known as reactants, to one or more distinct substances, known as products. Chemical elements or compounds are examples of substances.
A chemical reaction equation specifies the reactants and products, whereas a balanced chemical reaction equation specifies the reactants and products' mole relationships. The quantity of energy involved in the reaction is frequently mentioned. Reaction stoichiometry is the study of the quantitative aspects of chemical processes.
Synthesis (anabolic), decomposition (catabolic), and exchange are the t
Three primary types of chemical reactions involved in human physiology.
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How you do this I need help filling this quiz out
It is a double displacement reaction since new products are produced by displacement both reaction molecules Ca + AlCl₃ → Cacl₂ + Al
2. AgNo₃ + MgCl₂ → AgCl + Mg(NO₃)₂
3. H₃PO₄ + NaOH → Na₃PO₄ + H₂O
4. Zn + AgCl → ZnCl₂ + Ag
5. H₂SO₄ + NaCN → Na₂SO₄ + HCN
6. HClO₃ + Ca(OH)₂ → Ca(ClO₃)₂ + H₂O
7. FeO + Cl₂ → FeCl₂ + O₂
8. BaO + H₂O → Ba(OH)₂ + H₂O
9. Mg + HBr → MgBr₂ + H₂
10. NO +Cl₂ → NOCl
Chemical reaction :
When atoms establish or break chemical bonds, chemical processes take place. Reactants are the substances that begin a chemical reaction, while products are the compounds that are created as a result of the reaction. A chemical change is the transformation of one substance into another, the emergence of new compounds with distinct properties, or any combination of these. It happens when two compounds mix to create a new material (synthesis or either decomposes to form more substances).
How does a chemical reaction start?When atoms establish or break chemical bonds, chemical processes take place. Reactants are the substances that start a chemical reaction, while products are the substances that come out of the process.
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Consider the reactant shown. Select all statements that correctly describe the reduction of this compound.
Reduction is an activity to reduce something. In chemistry there is also a reduction reaction that is related to the oxygen content of a substance.
When a reduction reaction occurs, the substance will experience an increase in electrons, making it more negative. The following are examples of reduction reactions that occur in everyday life:
Iron Ore ExtractionIn the extraction of iron oxide (iron ore) is reduced to remove the oxygen in it. This is done to obtain pure iron (Fe) with the help of carbon monoxide (CO) as a reducing agent.
Copper refining reactionCopper purification reaction using a voltaic cell. Where Cu2+ ions will undergo a reduction reaction with a reducing agent in the form of magnesium to produce a precipitate of pure copper (Cu). From the reaction it can be seen that Cu has increased by 2 electrons so that its charge becomes neutral.
Reaction of copper (II) oxide and magnesiumAccording to Chemical Equations, this reaction is a reaction between magnesium (Mg) powder and black copper (II) oxide (CuO) powder to produce pure copper (Cu) and white magnesium oxide (MgO) powder.
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assuming all are in the liquid phase, which of the following substances would you expect to be able to place the maximum number of drops of on the surface of the penny?
The material with the highest surface tension is the one that can hold the most drips on a penny. So, [tex]HF[/tex] is the correct answer.
It behaves as though its surface were an elastic membrane because of a liquid quality. The The strength of this membrane-like activity increases with a liquid's surface tension. Because of this, a liquid with a high surface tension will favor taking the shape of an object with a limited surface area. This explains why a high surface tension liquid develops into a more compact shape, allowing for the placement of more droplets on the coin, as opposed to a low surface tension liquid. In other words, the amount of droplets that can fit on a penny depends on the surface tension of the liquid.
A penny can hold the most drops on the substance with the highest surface tension. A liquid's surface's elastic tendency to reduce surface area is referred to as surface tension. As the most electronegative element, fluorine creates stronger hydrogen bonds, which contribute to higher surface tension.
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The complete question is:
On the surface of a penny, liquid droplets are put as part of an experiment. Assuming all are in the liquid phase, which of the following substances would you expect to be able to place the maximum number of drops of on the surface of the penny?
a) [tex]HF[/tex]
b) [tex]H_2O[/tex]
c) [tex]CH_3CH_2CHO[/tex]
d) [tex]CCl_4[/tex]
When observing a rainbow, the sun is always at your back. Because most showers move
from west to east, a rainbow in the morning means the shower is approaching; a rainbow
in the evening means showers are departing.
According to the information provided, what conclusion can be drawn about rainbows?
A. All rainbows are equal in color intensity and dimension.
B. A rainbow always occurs at the end of a powerful storm.
C. The absorption and retention of light make up the first stage in the creation of a
rainbow.
D. A rainbow usually occurs when the sun is setting.
E. Refraction, reflection, and diffraction of light are essential in the formation of a
rainbow.
Answer:
E. Refraction, reflection, and diffraction of light are essential in the formation of a rainbow.
According to the information provided, it is stated that the sun is always at your back when observing a rainbow, and that the time of day can indicate whether a shower is approaching or departing. This suggest that the formation of the rainbow is dependent on the position of the sun and the presence of water droplets in the air, which are refracted, reflected, and diffracted by the light from the sun. It doesn't indicate anything about the color intensity or dimension of the rainbow, nor whether it always occurs at the end of a powerful storm or when the sun is setting.
giving reasons, state which carbocation out of the two below 2 would be more stable: (A) (ch3)3c - CH2+ (B) (CH3)3C^+ (c) CH3CH2CH2^+ (d) CH3 CH^+ CH2CH3
The amount of alkyl groups connected to the positive carbon, the degree of substitution on the positive carbon, and the presence of electron-donating or electron.
withdrawing groups all influence the stability of carbocations. Carbocation (C) CH3CH2CH2+ is thought to be more stable than carbocation (B) (CH3)3C+ based on these reasons. This is due to the fact that carbocation (C) contains three alkyl groups connected to the positive carbon, converting it to a tertiary carbocation, which is more stable than a secondary carbocation (B). In addition, carbocation (D) CH3 CH+ CH2CH3 is thought to be more stable than carbocation (C) CH3CH2CH2+. This is due to the fact that the positive carbon in carbocation (D) is surrounded by both methyl and ethyl groups, converting it to a tertiary allylic carbocation, which is much more stable.
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PLS HELP I DONT GET REDOX TITRATIONS
Potassium dichromate is used to titrate a solution of iron (II) chloride. The dichromate ion acts as its own indicator. As the Cr2O7^2- solution is added to the Fe^2+ solution, the orange dichromate ion is reduced to green Cr^3+ as it oxidizes the Fe^2+ to Fe^3+. The equivalence point is evident when the orange color remains, indicating that all the Fe^2+ has reacted. An amount of 20.0 mL of acidified FeCl2.
a) Balance the redox equation for this titration: Cr2O7^2- + Fe^2+ --> Cr^3+ + Fe^3+
b) What was the [FeCl2]?
The balanced redox reaction equation is written as;
[tex]2Cr_{2} O_{7} ^{2-} + 6Fe^{2+} +14H^+----- > 2Cr^{3+} + 6Fe^{3+} + 7H_{2} O[/tex]
What is the balanced redox reaction equation?We know that when we talk about the redox reaction, one of the species in the reaction has been oxidized while one of the species in the reaction has been reduced. As such, there would be a loos and gain of electrons in the process.
In this case, we can see that we have to write down the reaction equation and then we can be able to obtain the balanced reaction equation which would show the electrons that have been lost or gained.
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Determine the [OH−] , pH, and pOH of a solution with a [H+] of 0.0078 M at 25 °C. Determine the [H+] , pH, and pOH of a solution with an [OH−] of 0.0011 M at 25 °C. Determine the [H+] , [OH−] , and pOH of a solution with a pH of 7.77 at 25 °C. Determine the [H+] , [OH−] , and pH of a solution with a pOH of 2.15 at 25 °C.
a) The pH of the solution is 2.11
b) The pH of the solution is 2.96
c) The [H+] of the solution is 1.69 * 10^-8
d) The [OH−] of the solution is 7.1 * 10^-3
What is the pH?What we call the pH of the solution is the negative logarithm of the hydrogen ion concentration of the solution. In this case, we have been asked to obtain the pH of the solution at different points.
a) pH = -log (0.0078 )
= 2.11
pOH = 14 - 2.11 = 11.89
[OH−] = Antilog (-11.89)
= 1.3 * 10^-12
b) pH = -log (0.0011)
= 2.96
pOH = 14 - 2.96
= 11.04
[OH−] = Antilog (-11.04)
= 9.1 * 10^-12
c) [H+] = Antilog (-7.77)
= 1.69 * 10^-8
[OH−] = 1 * 10^-14/1.69 * 10^-8
= 5.9 * 10^-7
pOH = -log( 5.9 * 10^-7)
= 6.22
d) [OH−] = Antilog (-2.15)
= 7.1 * 10^-3
[H+] = 1 * 10^-14/ 7.1 * 10^-3
= 1.41 * 10^-12
pH = -log( 1.41 * 10^-12)
= 10.9
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energy an ecosystem, whereas chemical elements . answer unselected is burned in; are wasted unselected flows through; cycle within it unselected is lost in; are created unselected cannot be created nor destroyed in; disappear unselected is recycled in; flow through it unselected i don't know yet
In contrast to the worldwide recycling of chemical elements, energy travels via ecosystems.
An ecosystem is a region where a bubble of life is created by plants, animals, and other organisms interacting with the weather, environment, and other factors. Abiotic variables, or nonliving components, coexist with biotic components in ecosystems.
The food chain and food web are used to transfer energy. Plants, who are the primary energy providers in the ecosystem, use their chloroplasts to collect sunlight, which is then partially converted into chemical energy during photosynthesis.
Joules or calories are used to measure the energy input, or the energy that enters the environment. As a result, the energy flow is sometimes referred to as the calorific flow.
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WILL MAKE BRAINLIEST!! Show steps!
1.) A chemist needs to prepare 4.00 L of a 0.50 M solution of potassium permanganate (KMnO4). What mass of KMnO4 does she need to make the solution? This problem is similar to Sample Problem 16.3.
Show your work (4 Points) (Answer: 316.08 g)
2.) What volume of a 1.50 M solution of KCl needs to be diluted in order to prepare 2.40 L of a 0.0750 M solution? This problem is similar to Sample Problem 16.4. Show your work. (4Points) (Answer: 0.12 L)
3.) Determine the molality of a solution prepared by dissolving 20 g of sodium chloride (NaCl) in 150. g of water. This problem is similar to Sample Problem 16.5. Show your work. (4 Points) (Answer: 2.3 mol/Kg)
1.) Chemist needs 79.02 g of KMnO4 to make 4.00 L of a 0.50 M solution. 2.) You will need to use 0.12 L of 1.50 M solution to make 2.40 L of 0.0750 M solution. 3.) Solution has a molality of 0.00229 mol/kg.
What is molality?Molality is defined as a measure of number of moles of solute in a solution corresponding to 1 kg or 1000 g of solvent.
1.) As, mass = moles x molar mass
Molar mass of KMnO4 is 158.03 g/mol
So, mass = 0.50 mol x 158.03 g/mol = 79.02 g
Therefore, the chemist needs 79.02 g of KMnO4 to make 4.00 L of a 0.50 M solution.
2.)As , C1V1 = C2V2
Here C1 is initial concentration, V1 is initial volume, C2 is final concentration and V2 is the final volume.
1.50 M x V1 = 0.0750 M x 2.40 L
Now, V1 = (0.0750 M x 2.40 L) / 1.50 M
So, V1 = 0.12 L
You will need to use 0.12 L of the 1.50 M solution to make 2.40 L of the 0.0750 M solution.
3.) Formula for molality is: m = (moles of solute) / (kg of solvent)
As, moles = (mass of solute) / (molar mass of solute)
= (20 g) / (58.44 g/mol) = 0.344 mol
m = (0.344 mol) / (150 g / 1000 g/kg) = 0.00229 mol/kg
So, the solution has a molality of 0.00229 mol/kg.
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for the following chair conformations of 1,3-dibromocyclohexane, determine the orientations of the two substituents, and determine if the conformation is cis or trans.
The way the bonds are built will determine how they are oriented. Additionally, the relative orientation of bonds affects conformation. Dibromocyclohexane is used to study the conformation.
How can you tell whether a molecule is chiral or not?Having a few very notable exceptions, the general rule is that molecules with at least one stereocenter are chiral, while molecules with no stereocenters are achiral. In most circumstances, an easiest approach to determine whether a molecule is chiral or achiral is to seek for one or even more stereocenters.
What does cis in cyclohexane refer to?Two substituent groups inside the same plane are regarded to be the cis isomer of cyclohexane (either equatorial or axial). Cis-1-methyl-4-hydroxymethyl cyclohexane is cyclohexane with a methyl group in the axial plane (-CH3)also the hydroxyl group (-OH).
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Below is the amino acid histidine at pH 7. Select all the atoms that are part of a plane of three or more atoms.
Histidine was unique among amino acids in that it could exist in neutral or positively charged states inside the functional pH range of 5.0 to 7.0.
As a result, histidine may interact with the other aromatic residues and establish hydrogen bonds between polar but also charged residues.
Histidine seems to be a semi-essential amino acid (which children should get from food) that's also required in humans for growth as well as tissue repair. It is also essential for the preservation of myelin sheaths which protect nerve fibers and therefore is metabolized towards the neurotransmitter histamine.
Histamines perform a variety of roles in immune function, gastrointestinal secretion, as well as sexual function. Histidine too is essential for the production of blood cells and protects tissues from harm due to radiation as well as heavy metals.
Thus, the correct answer is (B)
The question is incomplete, the complete question is :
Below is the amino acid histidine at pH 7. Select all the atoms that are part of a plane of three or more atoms.
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