Which of the following statements best describes the arrangement of particles in a gas? [sm-1]
Close together and stationary
Close together and vibrating
Far apart and moving slowly
Very far apart and moving quickly
Which of the following statements best describes the arrangement of particles in a solid? [sm-2]
Close together and stationary
Close together and vibrating
Far apart and moving slowly
Very far apart and moving quickly
Which of the following statements best describes the arrangement of particles in a liquid? [sm-3]
Close together and stationary
Far apart and vibrating
Close together and moving freely
Very far apart and moving quickly
Which of the following best describes what happens to the particles of water when it freezes? [sm-4]
They gain energy and break up into atoms of hydrogen and oxygen,
They gain energy and gain freedom to move about
They lose energy and escape into the atmosphere
They lose energy and lose freedom to move about,
Which of the following best describes what happens to the particles of ice when it melts? [sm-5]
They gain energy and break up into atoms of hydrogen and oxygen,
They gain energy and gain freedom to move about
They lose energy and escape into the atmosphere
They lose energy and lose freedom to move about,
Which of the following best describes what happens to the particles of water when it boils? [sm-6]
They gain kinetic energy and increase their freedom to move without significant attraction
They gain energy and gain freedom to move about
They lose energy and escape into the atmosphere
They lose energy and lose freedom to move about,
Which of the following best describes what happens to the particles of water vapour when it condenses? [sm-7]
They gain kinetic energy and increase their freedom to move without significant attraction
They gain energy and gain freedom to move about
They lose energy and are closer and less free to move around
They lose energy and lose freedom to move about,
Which of the following best describes what happens to the particles of water when it evaporates? [sm-8]
The higher kinetic energy particles increase their freedom to move without significant attraction
They gain energy and gain freedom to move about
They lose energy and escape into the atmosphere
They lose energy and lose freedom to move about,
The table shows the melting points and boiling points of some substances. Which substance is a solid at 25oC? [sm-9]
[Substance] Melting Point oC and Boiling Point oC
-39 and 354
119 and 446
15 and 126
-127 and -33
The table shows the melting points and boiling points of some substances. Which substance is a liquid at 0oC? [sm-10]
[Substance] Melting Point oC and Boiling Point oC
-39 and 354
119 and 446
15 and 126
-127 and -33
The table shows the melting points and boiling points of some substances. Which substance is a gas at 0oC? [sm-11]
[Substance] Melting Point oC and Boiling Point oC
-39 and 354
119 and 446
15 and 126
-127 and -33
The table shows the melting points and boiling points of some substances. Which substance is a liquid at 30oC? [sm-12]
[Substance] Melting Point oC and Boiling Point oC
-39 and 10
119 and 446
15 and 126
-127 and -33
Air is confined in a glass bottle with a tight screw-top. When the bottle becomes warmer when heated with a hair-dryer, the pressure inside increases because the molecules of air? [sm-13]
become bigger
become smaller
move faster
move slower
Air is in a glass bottle with a tight screw-top. When the bottle becomes cooler when placed in a refrigerator, the pressure inside decreases because the molecules of air? [sm-14]
become bigger
become smaller
move faster
move slower
When the air in a room becomes warmer a hanging balloon blown up with air becomes bigger because the molecules of air? [sm-15]
become bigger
become smaller
move faster
move slower
When the air in a room becomes cooler a hanging balloon blown up with air becomes smaller because the molecules of air? [sm-16]
become bigger
become smaller
move faster
move slower
The table shows the melting points and boiling points of some substances. Which substance is a liquid at 20 oC? [sm-17]
[Substance] Melting Point oC and Boiling Point oC
-142 and -78
-95 and 4
-66 and 42
90 and 189
The table shows the melting points and boiling points of some substances. Which substance is a solid at 20oC? [sm-18]
[Substance] Melting Point oC and Boiling Point oC
-142 and -78
-95 and 4
-66 and 42
90 and 189
The table shows the melting points and boiling points of some substances. Which substance is a gas at -60oC? [sm-19]
[Substance] Melting Point oC and Boiling Point oC
-142 and -78
-95 and 4
-66 and 42
90 and 189
The table shows the melting points and boiling points of some substances. Which substance is a liquid at -10oC and a gas at 10oC? [sm-20]
[Substance] Melting Point oC and Boiling Point oC
-142 and -78
-95 and 4
-66 and 42
90 and 189
Which of the following graphs represents how the temperature of liquid varies as it becomes a solid? [sm-21]
graph 1
graph 2
graph 3
graph 4
Which of the following graphs represents how the temperature of gas varies as it becomes a liquid? [sm-22]
graph 1
graph 2
graph 3
graph 4
Which of the following graphs represents how the temperature of solid varies as it becomes a liquid? [sm-23]
graph 1
graph 2
graph 3
graph 4
Which of the following graphs represents how the temperature of liquid varies as it becomes a gas? [sm-24]
graph 1
graph 2
graph 3
graph 4
Which of the following graphs represents how the temperature of gas varies as it eventually becomes a solid? [sm-25]
graph 1
graph 2
graph 3
graph 4
Which of the following graphs represents how the temperature of solid varies as it eventually becomes a gas? [sm-26]
graph 1
graph 2
graph 3
graph 4
Which of the following is true as a gas is changing to a liquid in condensation? [sm-27]
increase in particle order
temperature rises
particles gain more freedom
energy change is endothermic
Which of the following is true as a gas is changing to a liquid in condensation? [sm-28]
decrease in particle order
temperature rises
particles lose freedom
energy change is endothermic
Which of the following is true as a gas is changing to a liquid in condensation? [sm-29]
decrease in particle order
temperature rises
particles gain freedom
energy change is exothermic
Which of the following is true as a liquid changes to a solid in freezing? [sm-30]
increase in particle order
temperature falls
particles gain freedom
energy change is endothermic
Which of the following is true as a liquid changes to a solid in freezing? [sm-31]
decrease in particle order
temperature stays constant
particles gain freedom
energy change is endothermic
Which of the following is true as a liquid changes to a solid in freezing? [sm-32]
decrease in particle order
temperature falls
particles lose freedom
energy change is endothermic
Which of the following is true as a liquid changes to a solid in freezing? [sm-33]
decrease in particle order
temperature falls
particles gain freedom
energy change is exothermic
Which of the following is true as a solid changes to a liquid in melting? [sm-34]
decrease in particle order
temperature rises
particles lose freedom
energy change is exothermic
Which of the following is true as a solid changes to a liquid in melting? [sm-35]
increase in particle order
temperature stays constant
particles lose freedom
energy change is exothermic
Which of the following is true as a solid changes to a liquid in melting? [sm-36]
increase in particle order
temperature rises
particles gain freedom
energy change is exothermic
Which of the following is true as a solid changes to a liquid in melting? [sm-37]
increase in particle order
temperature rises
particles lose freedom
energy change is endothermic
Which of the following is true as a liquid changes to a gas in boiling? [sm-38]
decrease in particle order
temperature rises
particles lose freedom
energy change is exothermic
Which of the following is true as a liquid changes to a gas in boiling? [sm-39]
increase in particle order
temperature stays constant
particles lose freedom
energy change is exothermic
Which of the following is true as a liquid changes to a gas in boiling? [sm-40]
increase in particle order
temperature rises
particles gain freedom
energy change is exothermic
Which of the following is true as a liquid changes to a gas in boiling? [sm-41]
increase in particle order
temperature rises
particles lose freedom
energy change is endothermic
Which of the following is true as a liquid changes to a gas in evaporation? [sm-42]
decrease in particle order
temperature stays constant
particles lose freedom
energy change is exothermic
Which of the following is true as a liquid changes to a gas in evaporation? [sm-43]
increase in particle order
temperature falls
particles lose freedom
energy change is exothermic
Which of the following is true as a liquid changes to a gas in evaporation? [sm-44]
increase in particle order
temperature stays constant
particles gain freedom
energy change is exothermic
Which of the following is true as a liquid changes to a gas in evaporation? [sm-45]
increase in particle order
temperature stays constant
particles lose freedom
energy change is endothermic
When water vapour in a cloud is gradually cooled, rainwater is formed. This change of state is called? [sm-46]
condensation
distillation
evaporation
saturation
Heat from the Sun changes water from liquid to a gas. This change of state is called? [sm-47]
condensation
distillation
evaporation
saturation
Gases diffuse because they? [sm-48]
are made of rapidly moving particles
have low boiling points
have a low density
easily move as convection currents
Liquids and dissolving solids diffuse because they? [sm-49]
are made of moving particles
have low boiling points
have a low density
easily move as convection currents
The table below shows the melting points and boiling points of substances A to D. Which substance is a gas at 25oC? [sm-50]
[Substance] Melting point oC(mpt), Boiling Point oC(bpt)
mpt = -127o, bpt = -33 oC
mpt = -39o, bpt = 354 oC
mpt = 63o, bpt = 760 oC
mpt = 119o, bpt = 446 oC
The table below shows the melting points and boiling points of substances A to D. Which substance is a liquid at 25oC? [sm-51]
[Substance] Melting point oC(mpt), Boiling Point oC(bpt)
mpt = -127o, bpt = -33 oC
mpt = -39o, bpt = 354 oC
mpt = 63o, bpt = 760 oC
mpt = 119o, bpt = 446 oC
The table below shows the melting points and boiling points of substances A to D. Which substance is a solid at 100oC? [sm-52]
[Substance] Melting point oC(mpt), Boiling Point oC(bpt)
mpt = -127o, bpt = -33 oC
mpt = -39o, bpt = 354 oC
mpt = 63o, bpt = 760 oC
mpt = 119o, bpt = 446 oC
The table below shows the melting points and boiling points of substances A to D. Which substance is a solid at 100oC? [sm-53]
[Substance] Melting point oC(mpt), Boiling Point oC(bpt)
mpt = -127o, bpt = -33 oC
mpt = -39o, bpt = 154 oC
mpt = 99o, bpt = 140 oC
mpt = 101o, bpt = 110 oC
The table below shows the melting points and boiling points of substances A to D. Which substance is suitable to use in a thermometer that measures in the range 10oC to 90oC? [sm-54] [Substance] Melting point oC(mpt), Boiling Point oC(bpt)
mpt = 0o, bpt = 100 oC
mpt = -200o, bpt = 40 oC
mpt = 20o, bpt = 350 oC
mpt = -110o, bpt = 80 oC
The table below shows the melting points and boiling points of substances A to D. Which substance is suitable to use in a thermometer that measures in the range -120oC to 20oC? [sm-55] [Substance] Melting point oC(mpt), Boiling Point oC(bpt)
mpt = 0o, bpt = 100 oC
mpt = -200o, bpt = 40 oC
mpt = -40o, bpt = 350 oC
mpt = -110o, bpt = 80 oC
The table below shows the melting points and boiling points of substances A to D. Which substance is suitable to use in a thermometer that measures in the range 0oC to 100oC? [sm-56] [Substance] Melting point oC(mpt), Boiling Point oC(bpt)
mpt = 0o, bpt = 100 oC
mpt = -200o, bpt = 40 oC
mpt = -40o, bpt = 350 oC
mpt = -110o, bpt = 80 oC
The table below shows the melting points and boiling points of substances A to D. Which substance is suitable to use in a thermometer that measures in the range -4oC to 50oC? [sm-57] [Substance] Melting point oC(mpt), Boiling Point oC(bpt)
mpt = 0o, bpt = 100 oC
mpt = -200o, bpt = 40 oC
mpt = 40o, bpt = 350 oC
mpt = -110o, bpt = 80 oC
The rate of evaporation of a water does NOT depend on the? [sm-58]
humidity of the surrounding air
depth of the water
surface area of the water
temperature of the water
Which is true about the rate of evaporation of water? [sm-59]
it is speeded up on a humid day
it is due to the escape of the most energetic particles
heat is given out in the process
it is slowed down in a breeze
Which is true about the rate of evaporation of water? [sm-60]
it is speeded up on a dry day
it is due to the escape of the least energetic particles
heat is given out in the process
it is slowed down in a breeze
Which is true about the rate of evaporation of water? [sm-61]
it is speeded up on a humid day
it is due to the escape of the least energetic particles
heat is absorbed in the process
it is slowed down in a breeze
Which is true about the rate of evaporation of water? [sm-62]
it is speeded up on a humid day
it is due to the escape of the least energetic particles
heat is given out in the process
it is speeded up on a breezy day
Which of these statements is true about evaporation? [sm-63]
it is speeded up on a warm day
it is due to the escape of the least energetic particles
heat is given out in the process
it is speeded up on a humid day
The body is cooled down by sweating. This process mainly involves the heat transfer process of? [sm-64]
conduction
convection
evaporation
radiation
Which of the following describes heat transfer due to evaporation? [sm-65]
transfer due to the movement of volumes of gases or liquids
transfer due to loss of energetic particles from the surface of a liquid
transfer by infrared waves which can pass through air
transfer due to the vibration of particles in contact with each other
Which of the following best explains why gases diffuse throughout a container? [sm-66]
there are no attractive forces between the particles of a gas
gases have a low density
gas particles move fast
gas particles are very small
Which of the following best explains why gases have a low density? [sm-67]
the gas particles are very small
the particles are far apart
gas particles move fast
the attractive force between particles are very weak