Which factor will have little effect on the solubility of saturated solutions?
A.
the temperature of the solvent
B.
the amount of extra time spent stirring the solution
C.
the amount of pressure the solvent is under
D.
the addition of other solutes
A) The most important factor for solubility is temperature
We define the solubility of a substance in a solvent at a particular temperature
a) for solids the solubility increases with increase in temperature
b) for gas the solubility decreases with increase in temperature
So temperature will have huge effect on solubility of a saturated solution
B) the amount of extra time spent stirring the solution will hardly any effect or may have a very little effect. As stirring helps in solubility and if we have a saturated solution then it will not affect the solubility of the solution
C) The solubility is affected by the pressure on solvent
For gaseous solute the solubility is proportional to the pressure exerted on the solvent. More the pressure more the solubility.
D) the other solutes may affect the solubility as they may react with the solute or may interfere with the solute solvent interaction
Hence answer is "B"
Why metals are denser than non - metals ? ...?
Which elements are the main components of the Sun?
how many carbon atoms are present in a mol of 12C?
The molar mass of carbon is 40.08, oxygen is 16.0, what is the molar mass of glucose
Answer:
348
Explanation:
How many moles of hydrogen gas would be needed to react with excess carbon dioxide to produce 19.1 moles of water vapor?
To produce 19.1 moles of water vapor when carbon dioxide is in excess, 19.1 moles of hydrogen gas are needed, based on the stoichiometry of the water-gas shift reaction.
Explanation:To determine how many moles of hydrogen gas would be needed to react with excess carbon dioxide to produce 19.1 moles of water vapor, we need to consider the balanced chemical equation for the reaction. The reaction in question is not stated, but it is likely a form of the water-gas shift reaction, which is:
CO2 + H2 → CO + H2O
From the equation, we can see that for every mole of H2O produced, one mole of H2 is required, assuming that carbon dioxide (CO2) is in excess.
Therefore, if we have 19.1 moles of water vapor (H2O), we need 19.1 moles of hydrogen gas (H2).
Final answer:
To produce 19.1 moles of water vapor by reacting hydrogen gas with excess carbon dioxide, 19.1 moles of hydrogen gas would be required, assuming a 1:1 stoichiometry.
Explanation:
To determine how many moles of hydrogen gas are needed to react with excess carbon dioxide to produce 19.1 moles of water vapor, we need to consider the balanced chemical equation:
H₂ (g) + CO₂ (g) → H₂O (g) + CO (g)
However, the provided examples do not directly address this reaction. Instead, we can deduce from the given information that:
The formation of water from hydrogen and oxygen follows a stoichiometry of 2 H₂:1 O₂:2 H₂O.In a similar vein, if we assume the reaction consuming hydrogen and carbon dioxide produces water and carbon monoxide in a 1:1 stoichiometry (as in the Sabatier process), we have:
H₂ (g) + CO₂ (g) → H₂O (g) + CO (g)
For every mole of water produced, one mole of hydrogen is required. Therefore, for 19.1 moles of water, 19.1 moles of hydrogen gas are needed.
which part of the mantle is still solid but flows like a heavy liquid
The Earth is composed of four different layers. Many geologists believe that as the Earth cooled the heavier, denser materials sank to the center and the lighter materials rose to the top. Because of this, the crust is made of the lightest materials (rock- basalts and granites) and the core consists of heavy metals (nickel and iron).
The crust is the layer that you live on, and it is the most widely studied and understood. The mantle is much hotter and has the ability to flow. The Outer and Inner Cores are hotter still with pressures so great that you would be squeezed into a ball smaller than a marble if you were able to go to the center of the Earth!!!!!!
The mass number of an atom is found by adding
How does eating contribute to the flow of energy in an ecosystem?
Answer: The correct answer is-
Flow of energy in an ecosystem ( a large community of life forms that interact with each other as well as their physical environment in a particular area) takes place through food chain.
A food chain is a linear network of different organisms ( occupying different trophic levels) where organisms at one trophic level consumes organisms at previous trophic level and energy flow takes place in the form of organic matter.
Producers ( such plants) prepare their own food through photosynthesis and occupy the first trophic level.
Producers are eaten by primary consumers ( which are generally herbivores such as rabbits).
Primary consumers are eaten by secondary consumers, which are then eaten by tertiary consumers that are eaten by final consumers and then decomposers ( such as Fungi).
Example- Grass → Grasshopper → Frog→ Snake → Hawk → Fungi
What is the percentage of nitrogen in N2O? Show all calculations leading to an answer. Help
a salt shaker filled with 17.0g sodium chloride contain how many moles?
The number of moles in 17.0g sodium chloride is 0.291 moles
What are moles?In the International System of Units, Mole is the base unit of the amount of any substance.
The mass of NaCl is 17.0 g
The molar mass of Na is 22.99 g/mol
The molar mass of Cl is 35.45 g/mol
The molar mass of NaCl will be
(22.99 g/mol + 35.45 g/mol) = 58.44 g/mol
[tex]\rm Number\;of \;moles= \dfrac{mass}{molar\;mass}\\\\\\\rm Number\;of \;moles= \dfrac{17.0 g}{58.44\; g/m} =0.291 mol[/tex]
Thus, the number of moles in 17.0g sodium chloride is 0.291 moles.
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A book is sitting on the table at rest. The forces acting on the book include _______, and these forces are _______.
A.
gravity pushing up and friction pushing to the right; balanced
B.
gravity pushing down and the table pushing up; unbalanced
C.
gravity pushing down and the table pushing up; balanced
D.
gravity pushing up and friction pushing to the right; unbalanced
c. this is the real answer lol
Final answer:
A book is sitting on the table at rest. The forces acting on the book include gravity pushing up and friction pushing to the right, and these forces are balanced. So the correct option is C.
Explanation:
The force acting on a book sitting at rest on a table is gravity pushing down and the table pushing up with a normal force. Since the book is at rest, these forces must be equal in magnitude but opposite in direction, and therefore they are balanced. Option C, gravity pushing down and the table pushing up; balanced, is the correct answer. The force of gravity is also known as the book's weight, and since the book is not accelerating, the normal force must be equal to the gravitational force to maintain equilibrium, according to Newton's first law of motion.
At STP, when 3.75 liters of oxygen reacts with excess glucose, what volume of carbon dioxide does it produce? 6O₂(g) + C₆H₁₂O₆(g) d 6H2O(g) + 6CO₂(g)
How will the following changes affect the mole fraction of chlorine gas, χcl2, in the equilibrium mixture.?
Decreasing the volume of an equilibrium mixture by a factor of 3 will cause a corresponding increase in pressure. According to Le Châtelier's Principle, the system will adjust to reduce this increase in pressure by shifting the equilibrium to the side with fewer moles of gas. Therefore, the mole fraction of chlorine gas, χcl2, will decrease.
Explanation:To understand how changes in conditions might affect the mole fraction of chlorine gas, χcl2, it's necessary to refer to Le Châtelier's principle, which states that a system in equilibrium will adjust so as to reduce any stress placed on it. The stress can be a change in pressure, volume, or concentration of reactants or products.
If you decrease the volume of the system by a factor of 3, the system will adjust to decrease the pressure by shifting the equilibrium to the side with fewer moles of gas. Given the reaction SbCl3 (g) + Cl2 (g) and knowing that chlorine molecules dissociate as per Cl2 (g) -> 2Cl(g), the system will respond to the increased pressure by shifting to the right to reduce the total number of gas molecules. This decrease of chlorine gas on the left side of the reaction will cause its mole fraction to decrease.
It is important to remember that changes shifting the equilibrium according to these process follow the rules defined by chemical equilibrium concepts and reaction quotient (Qc) values.
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How many grams of calcium phosphate can be produced when 89.3 grams of calcium chloride reacts with excess sodium phosphate?
As electrical energy is converted into heat energy, the total amount in the system
a. decreasedb. increase
c. remains the same
Answer: Option (c) is the correct answer.
Explanation:
According to law of conservation of energy, energy can neither be created nor it can be destroyed as it can only be converted from one form to another.
For example, in the given situation electrical energy is converted into heat energy.
This means that the total amount of the electrical energy is actually equal to the total amount of heat energy. As only change in the form of energy has taken place.
Thus, we can conclude that as electrical energy is converted into heat energy, the total amount in the system remains the same.
Why is hydrogen chloride (HCl) polar?
it has equally shared electrons
it has unequally shared electrons
it has bent asymmetry
it has linear symmetry
It has unequally shared electrons is the right answer.
Answer: Option B
Explanation: Unequally shared shared electrons
i just got it right on the mastery test^^^^^
De Broglie hypothesized that all matter has some wave-like properties, even though it is made of particles.
True
False
Isn't this true? De Broglie hypothesized that all matter has some wave-like properties, even though it is made of particles.
True
False
Isn't this true?
During an diffusion experiment, it took 75 seconds for a certain number of moles of an unknown gas
to pass through a tiny hole. Under the same conditions, the same number of moles of oxygen gas
passed through the hole in 30 seconds. What is the molar mass of the unknown gas?
Answer:
200 g/mol is the molar mass of the unknown gas.
Explanation:
Effusion is defined as volume of gas dispersed in a given interval of a time.
[tex]R=\frac{Volume}{time}[/tex]
Number of moles of gas are directly proportional to the volume occupied by the gas.
[tex]moles \propto Volume[/tex] (at constant temperature and pressure)
[tex]\frac{n_1}{V_1}=\frac{n_2}{V_2}[/tex]
If n moles of unknown gas occupies V volume then n moles of oxygen will occupy:
[tex]V_1=\frac{n\times V}{n}=V[/tex]
The n moles of unknown gas pass through a tiny hole in 75 seconds.The effusion rate is give as:
[tex]R=\frac{V}{75 s}[/tex]
The n moles of oxygen gas pass through a tiny hole in 30 seconds.The effusion rate is give as:
[tex]R'=\frac{V}{30 s}[/tex]
According to Graham law: the effusion rate is inversely proportional to the square root of molar mass of the gas.
[tex]\frac{R}{R'}=\sqrt{\frac{32 g/mol}{M}}[/tex]
[tex]\frac{\frac{V}{75 s}}{\frac{V}{30 s}}=\sqrt{\frac{32 g/mol}{M}}[/tex]
[tex]M=\frac{32 g/mol\times 75\times 75}{30 \times 30}=200 g/mol[/tex]
200 g/mol is the molar mass of the unknown gas.
The molar mass of the unknown gas that diffused in the experiment is 200 g/mol.
The given parameters;
mass of the unknown gas = m₁mass of oxygen gas, m₂ = 32 g/moltime for oxygen gas diffusion, t₂ = 30 stime for the unknown gas diffusion, t₁ = 75 sThe rate of diffusion of the gases is calculated using Graham's law of diffusion as follows;
[tex]\frac{R_1}{R_2} = \frac{t_2}{t_1} = \sqrt{\frac{M_2}{M_1} } \\\\(\frac{t_2}{t_1} )^2 = \frac{M_2}{M_1} \\\\(\frac{30}{75})^2 = \frac{32}{M_1} \\\\0.16 = \frac{32}{M_1} \\\\M_1 = \frac{32}{0.16} \\\\M_1 = 200 \ g/mol[/tex]
Thus, the molar mass of the unknown gas that diffused in the experiment is 200 g/mol.
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Which of the following reactions is endothermic?
H2(g) + ½ O2(g)H2O(g),H = -57.82 kcal
½N2(g) + O2(g) + 8.1 kcalNO2(g)
½ N2(g) + 3/2 H2(g)NH3(g) + 11.0 kcal
C(diamond)+ O2(g)CO2,H = -94.50 kcal
Nitrogen gas consists of _____.
two separate nitrogen atoms
a diatomic nitrogen atom
a molecule of two nitrogen atoms
a compound of nitrogen atoms
The average atomic mass recorded on the periodic table for krypton is 83.80 u. This indicates that the most abundant isotope of krypton is
krypton-82.
krypton-83.
krypton-84.
krypton-85.
Answer : Option C) Krypton - 84
Explanation : The average atomic mass recorded on the periodic table for krypton is 83.80 u. This indicates that the most abundant isotope of krypton is Krypton - 84.
As the natural abundance of krypton - 84 is higher than the other isotopes of the krypton, which is 56.99 percent. This the most stable form of Kr that exists in nature. Rest other isotopes are not that readily available and also not that stable as compared to Krypton - 84.
Krypton - 83 has natural abundance as 11.50 percent and krypton - 82 has natural abundance 11.59 percent.
So, this clearly explains that the most abundant krypton isotope is Krypton - 84.
Which of the following is a pure substance? Pure gold, pure milk, pure water, pure seawater, pure sand. And how do you know?
Which of the following is the correct formula for sodium oxide? NaO2 NaO Na2O3 Na3O4 Na2O
Answer:
Na2O
Explanation:
Just took the quiz
This system relates to the process by which an organism gets rid of its waste.
A common method used to separate liquid solutions is _____.
filtering
separation by density
fractional distillation
crystallization
Answer:
c) Fractional distillation
Explanation:
A common method used to separate liquid solutions is fractional distillation.
In this process a mixture of two or more liquids that differ in their boiling points are heated. The liquid with the lowest boiling point vaporizes first which is passed onto a condenser and separated out. The same process ensues for the next liquid component until all are separated out in fractions based on their respective boiling points.
For example, consider a mixture of ethanol (b.pt 78 C) and water (b.pt 100 C). The two liquids can be separated by heating the mixture, in which ethanol separates out first followed by water.
What kind of substance is sodium chloride?
Give the approximate bond angle for a molecule with a trigonal planar shape.
A) 109.5°
B) 180°
C) 120°
D) 105°
E) 90°
Determine how many moles of Ba(OH)2 are required to completely neutralize 0.432 mole of HC2H3O2.
Answer: We need 0.216 moles of Ba(OH)2 to completely neutralize 0.432 moles of HC2H3O2.
Explanation:
First we build the equation that represents the reaction between the Ba(OH)2 and the HC2H3O2.2 CH3COOH + Ba(OH)2 = Ba(Ch3COO)2 + 2 H2O
Second, we use the amount of moles giving (0.432 moles HC2H3O2) in order to calculate the moles of Ba(OH)2 produced, using the coefficients in the equation.0.432moles CH3COOH x [1 mol Ba(OH)2/ 2 moles CH3COOH] = 0.216 moles Ba(OH)2
State the total number of electrons occupying the p orbitals in one chlorine atom?