100 pOiNtS
Explain why the vapor pressure of a solution differs from that of the pure solvent
Explain why the freezing point of a solution differs from that of the pure solvent
Explain why the boiling point of a solution differs from that of the pure solvent
Answers
Answer:
Answer one:
Solute particles block some of the ability of liquid particles to evaporate. We can then conclude, solutions of solid solutes typically have a lower vapor pressure than pure solvents.
Answer two:
Solutions freezing points are lower than of the pure solvent or solute because freezing (becoming a solid) creates order and decreases entropy.
Answer three:
The presence of solute particles decreases the vapor pressure of the liquid solvent, this means a higher temperature is needed to reach the boiling point.
Explanation:
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Related Questions
Determine the number of moles of air present in 1.35 l at 750 torr and 17.0°c. ideal gas law formula: pv = nrt(r = 62.396 l•torr/mol•k) which equation should you use? p equals startfraction n r t over v endfraction. n equals startfraction r t over p v endfraction. n equals startfraction p v over r t endfraction.
Answers
The number of moles of air present is 0.056 mole
What is the ideal gas equation?The ideal gas is one in which molecules do not attract or repel each other.Many gases like oxygen,nitrogen, carbon di oxide can be treated as the ideal gases as particular temperature and pressure.The real gases at high temperature and lower pressure can be treated as ideal gases.
The given data in the question is
Volume = 1.35 L
Pressure (P) = 750 torr
Temperature (T) = 17 °C = 17 + 273 = 290 K
Gas constant (R) = 62.396 L•torr/mol•K
The number of moles (n) =?
How to determine the number of moles:
The number of moles present can be obtained by using the ideal gas equation as illustrated below:
[tex]PV=nRT[/tex]
Divide both sides by RT
[tex]n=\dfrac{PV}{RT}[/tex]
[tex]n=\dfrac{(750\times 1.350}{62.396\times 290)}[/tex]
[tex]n=0.056\ moles[/tex]
Hence, the number of moles of air present is 0.056 mole
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Answer:
answer in picture
Explanation:
Suppose you’re out of acetic acid (ch3cooh) and decide to use ethanol (ch3 ch2oh) as the solvent in the transformation of 3 into 4. Would this be a wise choice, and why?
Answers
The use of ethanol instead of acetic acid is not the wise choice.
Why use of ethanol instead of acetic acid is not the wise choice?When you are out of acetic acid and decide to use ethanol as the solvent in the transformation, it would not be a wise choice because acetic acid and ethanol are two totally different chemicals. Due to different in features, it can't act the same and the desirable results can't be observed.
So we can conclude that use of ethanol instead of acetic acid is not the wise choice.
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To use ethanol in place of acetic acid as a solvent in the transformation of 3 into 4, is not a wise choice.
What are functional groups?Functional groups are the specific groups which after attaching to any molecule changes the property of the molecule.
Acetic acid has carboxylic (-COOH) group as functional group and ethanol has hydroxyl (-OH) functional group and both has different properties from each other. So use to ethanol in place of acetic acid is not correct as it will not fulfill the requirements of acid.
Hence use of ethanol in place of acetic acid is not a wise choice.
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A bicycle tire has a volume of 1.0 l at 22°c. if the temperature of the tire is increased to 52°c, what is the resulting volume of the tire? type in your answer using the correct number of significant figures. use the formula for charles' law: v1 t1 = v2 t2 l
Answers
The relationship between the volume, temperature, and pressure of the gas can be given by Charles law. The volume of the tire is 1.1 L.
What is Charle's law?According to Charles's law, the volume is directly proportional to the temperature of the gas at a constant pressure.
Charle's law can be shown as,
[tex]\rm \dfrac{V_{1}}{T_{1}} = \rm \dfrac{V_{2}}{T_{2}}[/tex]
Given,
Initial volume = 1.0 L
Initial temperature = 295 K
Final volume = ?
Final temperature = 325 K
Substituting values in the above equation the final volume can be calculated as:
[tex]\begin{aligned}\rm V_{2} &= \rm \dfrac{V_{1}T_{2}}{T_{1}}\\\\&= \dfrac{ 1 \times 325}{295}\\\\&= 1.1\;\rm L\end{aligned}[/tex]
Therefore, the final resulting volume of the tire is 1.1 L.
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Answer:
1.1 LExplanation:
Draw the structures of the aldol addition and condensation products of 3‑methylbutanal
Answers
Aldol condensation involves two aldehydes or two ketones or an aldehyde and a ketone. The product of the reaction is shown in the image attached.
What is Aldol condensation?Aldol condensation is a reaction that involves two aldehydes or two ketones or an aldehyde and a ketone. This reaction occurs at the carbonyl group as one of the carbonyl compounds is in the enolate form.
The product of the reaction is shown in the image attached. This gives the mechanism for the Aldol condensation of the compound 3‑methylbutanal.
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The graph shows the potential energy diagram for an unknown chemical change.
Which chemical change could the graph represent? (1 point)
Group of answer choices
Electrolysis of water
Combustion of iron
Photosynthesis in plants
Adding heat to decompose calcium carbonate
Answers
Based on the energy usage shown by the graph, the best option for the chemical change represented is the combustion of iron.
What chemical change is shown by the graph?The combustion of iron in oxygen leads to the formation of Iron (III) oxide in solid form.
For the combustion of iron to happen, a lot of heat has to be applied to the iron which is why the potential energy of reactants is high. As the reaction progresses, the energy needed reduces as iron (III) oxide is formed.
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What’s an example of a single displacement reaction in everyday life
Answers
Answer:
Any time a simple metal reacts with an acid it is a single displacement reaction.
Explanation:
A simple everyday example is acid indigestion. We can relieve the distress when the stomach produces too much
HCl by drinking a solution of sodium hydrogen carbonate. The H in the HCI
displaces the Na in NaHCO/3 to produce
H/2CO/3.
Calculate the [H+] in a 1.0 M solution of HA
Answers
If you were calculating for the [OH-] concentration, you would have to complete several conversions to find it. But since they ask for the [H+] concentration, your answer would be equal to the molarity of the solution.
what is a metal with 20 protons?
Answers
Answer: Calcium
Hope this helps
Why does knowing types of mixtures help you to identify a substance?
Answers
Answer:
This is my own explanation:
Explanation:
It is important to know the mixtures you input together because you may determine the type of substance you produced from different elements and several combinations of matter. This assists in identifying your specific substance.
6)Explain why a 0.010 M solution of hydrochloric acid, HCl has a pH of 2.00 but a 0.010 M solution of
acetic acid, HCH3COO, is 3.37?
Answers
0.010 M solution of hydrochloric acid, HCl has a pH of 2.00 but a 0.010 M solution of acetic acid, HCH₃COO, is 3.37 is because HCl dissociates more.
DissociationThis is the separation of ions of an ionic compound when it dissolves.
Hydrogen ion concentration of HClSince 0.010 M solution of hydrochloric acid, HCl has a pH of 2.00 its hydrogen ion concentration is gotten from
pH = -log[H⁺]
So,
[tex][H^{+} ] = 10^{-pH}[/tex]
So, [H⁺] = 10⁻²
Hydrogen ion concentration of HCH₃COOAlso, since 0.010 M solution of acetic acid, HCH₃COO, has a pH of 3.37, its hydrogen ion concentration is gotten from
pH = -log[H⁺]
So,
[tex][H^{+} ] = 10^{-pH}[/tex]
So, [H⁺] = 10⁻³°³⁷ = 0.000427 = 4.27 × 10⁻⁴
Since the hydrogen ion concentration of HCl is 10⁻² and the hydrogen ion concentration of HCH₃COO is 4.27 × 10⁻⁴, we see that HCl dissociates more than HCH₃COO.
So, 0.010 M solution of hydrochloric acid, HCl has a pH of 2.00 but a 0.010 M solution of acetic acid, HCH₃COO, is 3.37 is because HCl dissociates more.
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Which goal do all environmental regulations for industry serve?
to protect people and the environment
to limit industrial activities in all industries
to prevent deforestation by lumber companies to reduce greenhouse gas emissions
Answers
Answer:
To protect people and the environment.
Explanation:
In an ecosystem, the goal of all environmental regulations is to protect people and the environment.
What is an ecosystem?
Ecosystem is defined as a system which consists of all living organisms and the physical components with which the living beings interact. The abiotic and biotic components are linked to each other through nutrient cycles and flow of energy.
Energy enters the system through the process of photosynthesis .Animals play an important role in transfer of energy as they feed on each other.As a result of this transfer of matter and energy takes place through the system .Living organisms also influence the quantity of biomass present.By decomposition of dead plants and animals by microbes nutrients are released back in to the soil.
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1. What is the percent increase in carbon dioxide in the atmosphere between 2015 and 2020? Between 1960 and 2020? SHOW YOUR WORK!!!!
Answers
Answer:An accompanying WMO report on greenhouse gas concentrations shows that 2015-2019 has seen a continued increase in carbon dioxide (CO2) levels and other key greenhouse gases in the atmosphere to new records, with CO2 growth rates nearly 20% higher than the previous five years.
Explanation:That's because the annual growth rate of atmospheric carbon dioxide has roughly tripled, from 0.6 ppm per year in the early 1960s to an average 2.1 ppm during the past 10 years. At Mauna Loa, carbon dioxide concentrations in 2015 jumped by 3.05 ppm
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Which of the following cannot be used to extinguish the fire caused by electricity?
A. Carbon dioxide
B. Blanket
C. Sand
D. Water
Answers
D. Water
carbon dioxide reduces the oxygen concentration in the surrounding, thus no combustion can taken place.Blanket cuts the oxygen supply from the surroundings.Sand stops the oxygen from reaching the fire for a few moment.Water gives the fire a wide spread across the burning surface.If the freezing point depression for a solution is 2. 5°c and kf = 4. 5°c/m, what is the molality of the solution?
Answers
Given the freezing-point depression for a solution is 2. 5 °C and the cryoscopic constant is 4.5 °c/m, the molality of the solution is 0.56 m.
What is the freezing-point depression?Freezing-point depression is a drop in the temperature at which a substance freezes, caused when a smaller amount of another, non-volatile substance is added.
The freezing-point depression for a solution is 2. 5 °C. We can calculate the molality of the solution using the following expression.
ΔT = Kf × b
b = ΔT / Kf = 2.5 °C / (4.5 °C/m) = 0.56 m
where,
ΔT is the freezing-point depression. Kf is the cryoscopic constant of the solvent.b is the molality of the solution.Given the freezing-point depression for a solution is 2. 5 °C and the cryoscopic constant is 4.5 °c/m, the molality of the solution is 0.56 m.
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The molality of a solution will be 0.56 m. if the freezing point depression for a solution is 2.5° C.
What is molality?Molality is the measure of the moles of any solute in a solution per unit kg of the solvent.
Given, the freezing-point depression for a solution is 2. 5 °C
The kf is 4.5° c/m
[tex]\rm \Delta T = Kf \times b\\\\b = \dfrac{\Delta T}{kf} \\\\b = \dfrac{2.5^ \circ C}{4.5 \circ C/m} = 0.56 m[/tex]
Where T is freezing point depression
kf is cryoscopic constant of the solvent
b is molality of the solution
Thus, the molality of the solution is 0.56 m.
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Which of the following radioactive emissions is the least penetrating?
alpha particles
gamma rays
beta particles
Answers
Answer:
alpha particles
Explanation:
alpha particles the least penetrating but potentially most damaging and gamma rays the most penetrating. A beta particle, also called beta ray or beta radiation, is a high-energy, high-speed electron or positron emitted by the radioactive decay of an atomic nucleus during the process of beta decay.
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Based on the arrows, in which direction are air masses moving? from west to east from north to south toward the equator toward the middle latitude
Answers
Air masses are large air volume at constant humidity and a temperature it moves by convection in the atmosphere. The direction is from west to east.
What are the directions?Directions are the path or the points of something or an object. The earth has four major directions one towards the upper side called north, downwards called south, towards the left known as the west, and towards the right called east.
The image shows the movements of the arrow from the left to the right side. On the left is, the west and towards the right is the east.
Therefore, option a. from west to east is the movement of the air masses.
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Can someone please help its due today and im so bad at chemistry
Answers
Firefighters’ uniform is coated with a plastic that is fire resistant. Identify the plastic from the given options.
A. Teflon
B. Melamine
C. PET
D. Polyester
Answers
Answer:
Melamine
Explanation:
Melamine is also a non recyclable plasticThis plastic has very high heat resistance and also bad heat and electricity conducter.So it's used by firefightersWhat are two ways continents can grow?
Answers
Answer:
What are three ways continents get bigger?
age of rocks.
fossils.
evidence of melting (subduction)
location on current continents.
glacial deposits.
If an element has no electrons to share and is stable, what family is it
found in?
A alkali metals
B. noble gases
c. halogens
Answers
what is the barometric trend of the weather data?
Answers
Answer:
the change of atmospheric pressure during the last few (generally three) hours before a regular observation.
Explanation:
Even small changes in barometric pressure can greatly impact the weather. The Weather Trend directional arrow icon, included on many AcuRite weather station products, will show one of the following three barometric pressure trend directions, indicating potential future weather conditions.
Why do sea turtles rely on instincts more than mammals do?
Answers
Answer:
Mammals do not have instincts, so they must learn all their behaviors from their parents in order to survive.
Sea turtles must survive on their own, while mammals spend time with their parents and learn how to survive as they grow.
Sea turtles are less intelligent than mammals and, thus, cannot learn new behaviors from their parents.
Explanation:
Sea turtles rely on instincts more than mammals do, beacuse to get food for their survival.
What are instincts?Insticts are the natural impulse or motivation which are present from the inborn time to perform some functions in order to react in some specific external stimuli.
Mammals do not react impulsively in any external conditions because they have members or friends from their famliy side, who will teach them how to behave or react. But turtles didn't have that special person, so they do work rely on instincts to get food or many other purposes.
Hence, to survive sea turtles rely on instincts more than mammals do.
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A gas has a pressure of 326 mm Hg at 20 degrees Celsius. What is the temperature at 52.4 k Pa?
Answers
Answer:
it's is math that you can answer with your sister and your mother
Answer:
346 degrees because 326+20= 346
650.0 mL of a gas is under a pressure of 840.0 torr. What would the volume of
the gas be at a pressure of 1150.0 torr?
Answers
Answer:
Explanation:using the ideal gas formula, calculate the volume of 1.5omoles of a gas at 115kPA and a temperature of 298k?
Write a paragraph, citing examples from the text, to explain how Dr.
Paul Chirik's process could result in the development of flexible
manufacturing technologies.
Answers
Paul J. Chirik developed methods associated with chemistry catalysis and transition metals, which may result useful for the development of manufacturing technologies.
What is catalysis?Catalysis refers to the chemical processes that increase the rate of different types of reactions by lowering its activation energy.
Proteins (enzymes) are biological catalysts that increase the rate of chemical reactions in biological systems.
Catalysis may be reached by using transition metals (e.g., actinium and rutherfordium), which result useful in the development of manufacturing technologies.
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During Taylor's experiment, which piece of data would be qualitative?
mass of the cars
degree of the ramp incline
time in seconds
none are qualitative
Answers
From the available options with respect to Taylor's experiment, none of the data is qualitative.
Qualitative dataThese are data that cannot be measured using any instrument or assigned a numerical value.
Qualitative data are observable data based on perception.
This is unlike quantitative data that can be measured using relevant instruments and assigned numeric figures.
Mass can be measured in grams using a weighing balance, angle of inclination can be measured using relevant instruments, and time can be measured using a stopwatch.
Thus, none of the options is qualitative.
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Answer:
None are Qualitative
Explanation: I took the test and got a 100%
Are all molecules of ideal gas in motion with different velocities?
Answers
Explanation:
Individual gas molecules have different speeds. Collisions between these molecules can change individual molecular speeds, but this does not affect the overall average speed of the system.
What is the ph of the solution formed by mixing 25. 0 ml of a 0. 15 m solution of nh3 with 25. 0 ml of 0. 12 m hcl? (kb for nh3 = 1. 8 10–5 )
Answers
Answer:
Explanation:
the answer is 8.66
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The pH of the solution formed by mixing 25. 0 ml of a 0. 15 m solution of NH₃ with 25. 0 ml of 0. 12 m HCl is 8.66.
What is pH?pH is potential hydrogen. It is the measurement of the acidity and basicity of any solution.
The solution of NH₃ is 25. 0 ml of a 0. 15 m
The solution of HCl is 25. 0 ml of 0. 12 m hcl
The pkb value is [tex]1.8 \times 10^-^5[/tex]
Putting the value in the formula
[tex]pOH=pKb +log[NH_3][HCl]\\\\ pOH = 1.8 \times 10^-^5+ log \dfrac{25.0 \times 0.15}{ 25.0 \times 0.12} \\\\ pOH = 1.8\times10^-^5+ log1.25 \\\\pOH = 1.8\times 10^-^5 + 1.25 = 3.05\\\\ pH = 14 - pOH = 14 - 1.25 = 8.66[/tex]
Thus, the pH of the solution formed by mixing 25. 0 ml of a 0. 15 m solution of NH₃ with 25. 0 ml of 0. 12 m HCl is 8.66.
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What is the substance that is dissolved in a solution?
A)solvent
B)solute
C) mixture
D) electrolyte
Answers
Answer:
solute dissolves in a solution
Answer:
solvent
Explanation:
because solvent are liquid that disolves
A bicycle tire has a volume of 1. 0 L at 22°C. If the temperature of the tire is increased to 52°C, what is the resulting volume of the tire? Type in your answer using the correct number of significant figures. Use the formula for Charles' Law: V1 T1 = V2 T2 L.
Answers
The resulting volume of the tire would be 1.1 L
What is Charles's law?According to this law, the volume of a given gas is directly proportional to its temperature, provided that the pressure remains constant.
The law can be presented mathematically as;
[tex]\dfrac{V_1}{T_1} =\dfrac{V_2}{T_2}[/tex]
In this case, V1 = 1.0 L, T1 = 22 °C (295 K), T2 = 52 °C (325 K).
[tex]V_2=\dfrac{V_1T_2}{T_1}[/tex]V
[tex]V_2=\dfrac{1\times 325}{295}=1.1\ L[/tex]
Hence the final volume of the tire will be 1.1 L
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