#1
Which of the following is an example of a gas?
Oxygen
ExplanationOxygen is a gas commonly found in the Earth's atmosphere.
#2
What is the term for the process of a gas turning into a liquid?
Condensation
ExplanationCondensation is the process where a gas changes into a liquid.
#3
What is the boiling point of water in Celsius?
100°C
ExplanationWater boils at 100°C under standard atmospheric pressure.
#4
What is the term for the change of a substance directly from a solid to a gas?
Sublimation
ExplanationSublimation is the process where a substance transitions directly from solid to gas phase.
#5
Which of the following states of matter has a definite shape and volume?
Solid
ExplanationSolids have definite shapes and volumes, maintaining their structural integrity.
#6
What happens to the kinetic energy of particles as a substance changes from a solid to a liquid?
It increases
ExplanationThe kinetic energy of particles increases as they transition from a solid to a liquid state.
#7
Which of the following is an example of sublimation?
Dry ice (solid carbon dioxide) turning directly into gas
ExplanationSublimation is the process where a substance transitions directly from solid to gas phase without passing through the liquid phase, as seen in dry ice.
#8
Which gas is used as a coolant in refrigerators?
Freon (chlorofluorocarbon)
ExplanationFreon, specifically chlorofluorocarbons, are commonly used as coolants in refrigerators.
#9
What happens to the density of a gas when it is compressed?
It increases
ExplanationCompression increases the density of a gas.
#10
Which of the following is a characteristic property of a gas?
High compressibility
ExplanationGases have high compressibility, meaning they can be easily squeezed into smaller volumes.
#11
What is the critical point of a substance?
The temperature and pressure at which the liquid and gas phases of a substance become identical
ExplanationThe critical point of a substance is the temperature and pressure at which its liquid and gas phases become indistinguishable.
#12
At what temperature does absolute zero occur in Celsius?
-273.15°C
ExplanationAbsolute zero, the lowest possible temperature, is -273.15°C.
#13
What is the name for the state of matter with no fixed shape or volume?
Gas
ExplanationGases do not have fixed shapes or volumes, conforming to the shape and volume of their container.
#14
Which state of matter is characterized by having high temperature and ionized particles?
Plasma
ExplanationPlasma is a state of matter consisting of highly energized, ionized particles.
#15
What is the name of the state of matter in which particles have broken apart into charged ions?
Plasma
ExplanationPlasma is a state of matter where particles have broken apart into charged ions, characterized by high energy and conductivity.