#1
Which of the following is a characteristic of a gas?
Indefinite shape and volume
ExplanationGases have no fixed shape or volume.
#2
What happens to the kinetic energy of particles in a substance as it changes from a solid to a gas?
It increases
ExplanationKinetic energy increases as particles move from solid to gas state.
#3
Which of the following is an example of a physical change?
Melting of ice
ExplanationMelting of ice involves a change in state without altering the chemical composition.
#4
What is the process called when a gas changes directly into a solid?
Deposition
ExplanationDeposition is the transition of a gas directly into a solid.
#5
Which state of matter has the highest kinetic energy?
Plasma
ExplanationPlasma, being highly energetic, has the highest kinetic energy.
#6
Which of the following is an endothermic process?
Evaporation of water
ExplanationEvaporation absorbs heat, making it an endothermic process.
#7
At what temperature does water boil at sea level?
100°C
ExplanationWater boils at 100°C under standard atmospheric pressure at sea level.
#8
Which of the following is an exothermic process?
Freezing of water
ExplanationFreezing releases heat, making it an exothermic process.
#9
What is the process of a gas changing into a liquid called?
Condensation
ExplanationCondensation is the transformation of gas into liquid.
#10
Which law states that the volume of a given mass of gas is directly proportional to its absolute temperature, assuming pressure remains constant?
Charles's law
ExplanationCharles's law describes the relationship between volume and temperature at constant pressure.
#11
Which gas is commonly used as a coolant in refrigerators?
Ammonia
ExplanationAmmonia is frequently used as a refrigerant due to its cooling properties.
#12
Which of the following is true about plasma?
It conducts electricity
ExplanationPlasma is an ionized gas capable of conducting electricity.
#13
What is the phase transition from a gas to a solid called?
Deposition
ExplanationDeposition is the phase transition from gas to solid.
#14
What is the phase transition from a solid directly to a gas called?
Sublimation
ExplanationSublimation is the phase transition from solid to gas without passing through the liquid phase.
#15
What is the phase transition from a liquid to a gas called?
Evaporation
ExplanationEvaporation is the phase transition from liquid to gas.