Q. At what temperature does the Kelvin scale start?
A.
0°C
B.
100°C
C.
273.15°C
D.
0 K
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Solution
The Kelvin scale starts at absolute zero, which is 0 K or -273.15°C.
Correct Answer:
D
— 0 K
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Q. In a closed container, if the temperature of a gas is increased, what happens to the pressure if the volume remains constant?
A.
Pressure decreases
B.
Pressure remains constant
C.
Pressure increases
D.
Pressure fluctuates
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Solution
According to Gay-Lussac's Law, pressure is directly proportional to temperature at constant volume (P/T = k).
Correct Answer:
C
— Pressure increases
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Q. In a closed system, what happens to the total pressure when the volume is decreased at constant temperature?
A.
Increases
B.
Decreases
C.
Remains constant
D.
Fluctuates
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Solution
According to Boyle's Law, decreasing the volume of a gas at constant temperature increases the pressure.
Correct Answer:
A
— Increases
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Q. In an endothermic reaction, what happens to the enthalpy of the system?
A.
Increases
B.
Decreases
C.
Remains constant
D.
Fluctuates
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Solution
In an endothermic reaction, the system absorbs heat, resulting in an increase in enthalpy (ΔH > 0).
Correct Answer:
A
— Increases
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Q. What happens to the volume of a gas when the pressure is doubled at constant temperature?
A.
Volume doubles
B.
Volume halves
C.
Volume remains constant
D.
Volume quadruples
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Solution
According to Boyle's Law, if pressure is doubled, volume is halved at constant temperature.
Correct Answer:
B
— Volume halves
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Q. What is the effect of increasing pressure on the solubility of a gas in a liquid?
A.
Increases solubility
B.
Decreases solubility
C.
No effect
D.
Depends on temperature
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Solution
According to Henry's Law, increasing pressure increases the solubility of a gas in a liquid.
Correct Answer:
A
— Increases solubility
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Q. What is the effect of increasing temperature on the rate of a chemical reaction according to collision theory?
A.
Decreases the rate
B.
Increases the rate
C.
No effect
D.
Depends on the reaction
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Solution
Increasing temperature increases the kinetic energy of molecules, leading to more frequent and effective collisions, thus increasing the reaction rate.
Correct Answer:
B
— Increases the rate
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Q. What is the effect of increasing the number of moles of gas in a container at constant temperature and volume?
A.
Pressure decreases
B.
Pressure remains constant
C.
Pressure increases
D.
Temperature increases
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Solution
According to Avogadro's Law, increasing the number of moles of gas increases pressure if volume and temperature are constant.
Correct Answer:
C
— Pressure increases
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Q. What is the ideal gas constant (R) value in L·atm/(K·mol)?
A.
0.0821
B.
8.314
C.
62.36
D.
1.987
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Solution
The ideal gas constant R = 0.0821 L·atm/(K·mol) is used in the ideal gas law PV = nRT.
Correct Answer:
A
— 0.0821
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Q. What is the primary factor that determines the rate of a reaction according to the Arrhenius equation?
A.
Temperature
B.
Concentration
C.
Surface area
D.
Catalyst presence
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Solution
The Arrhenius equation shows that the rate constant increases exponentially with temperature.
Correct Answer:
A
— Temperature
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Q. What is the relationship between pressure and volume in an ideal gas at constant temperature?
A.
Boyle's Law
B.
Charles's Law
C.
Avogadro's Law
D.
Graham's Law
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Solution
Boyle's Law states that the pressure of a gas is inversely proportional to its volume at constant temperature (P1V1 = P2V2).
Correct Answer:
A
— Boyle's Law
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Q. Which gas law combines Boyle's, Charles's, and Avogadro's laws into one equation?
A.
Ideal Gas Law
B.
Dalton's Law
C.
Graham's Law
D.
Henry's Law
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Solution
The Ideal Gas Law (PV = nRT) combines Boyle's, Charles's, and Avogadro's laws.
Correct Answer:
A
— Ideal Gas Law
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Q. Which of the following statements is true about the phase transition from liquid to gas?
A.
It is an exothermic process
B.
It requires energy input
C.
It occurs at constant pressure only
D.
It decreases entropy
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Solution
The phase transition from liquid to gas (vaporization) requires energy input (endothermic process).
Correct Answer:
B
— It requires energy input
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