7G:Particles

We can detect oxygen using
1. a glowing splint
2. lime water
3. universal indicator
4. litmus
when we heat a gas
1. the gaps between the particles expand
2. the particles expand
3. the particles move slower
4. the pressure decreases
Adding salt to water
1. lowers the freezing point
2. raises the freezing point
3. does not affect the freezing point
4. decreases the density
The only metal that is liquid at room temperature is
1. mercury
2. neptunium
3. beryllium
4. barium
Which of these gases is less dense than air?
1. helium
2. carbon dioxide
3. chlorine
4. oxygen
Hot air rises because
1. it is less dense than the surrounding air
2. the particles are moving faster
3. it is hotter than the surrounding air
4. the particles are closer together
A volatile substance
1. evaporates readily
2. melts slowly
3. has a high boiling point
4. has a high melting point
Yellow street lights use
1. sodium
2. sulphur
3. mercury
4. potassium
Ultra-violet lamps use
1. mercury
2. sodium
3. sulphur
4. potassium
solids
1. have their own shape
2. can be poured
3. take on the shape of their container
4. expand greatly when heated
gases
1. expand greatly when heated
2. have their own shape
3. expand slightly when heated
4. are incompressible
when a substance is heated
1. the particles move further apart
2. the particles expand
3. the particles move slower
4. the particles form bonds
gases are compressible because
1. there are large distances between the particles
2. there are small distances between the particles
3. the particles are bonded to their neighbours
4. the particles vibrate
solids are
1. usually denser than liquids because the particles are closer together
2. usually less dense than liquids because the particles are closer together
3. usually less dense than liquids because the particles are further apart
4. usually denser than liquids because the particles are further apart
air is
1. a mixture of gases
2. a gaseous compound
3. a pure gas
4. 80% oxygen
coffee grounds do not pass through filter paper because
1. they are insoluble in water
2. they are soluble in water
3. they dissolve in water
4. the liquid is hot
diffusion is
1. particles mixing without being stirred
2. particles forming bonds
3. particles reacting
4. particles heavier than air
in a solid
1. the particles are bonded to their neighbours
2. the particles are free to move around
3. the particles are far apart, and moving fast
4. the particles do not move at all
in a liquid
1. the particles are free to move around
2. the particles are bonded to their neighbours
3. the particles do not move at all
4. the particles are far apart, and moving fast
in a gas
1. the particles are far apart, and moving fast
2. the particles are free to move around
3. the particles are bonded to their neighbours
4. the particles do not move at all
the pressure in a gas falls when the temperature falls because
1. the particles move slower
2. the particles move faster
3. the particles form stronger bonds
4. the bonds between the particles break
Particles in a gas collide with the walls of their container. This explains
1. why gases exert pressure
2. why gases are compressible
3. why gases expand when heated
4. why gases do not have their own shape
An Ancient Greek with ideas about particles was
1. Democritus
2. Archimedes
3. Aristotle
4. Hippocrates
Helium is
1. a gas lighter than air
2. a gas heavier than air
3. an inflammable gas
4. a poisonous gas
methane is
1. an inflammable gas
2. a non-flammable gas
3. a gas heavier than air
4. used in toy balloons
hydrogen is
1. an inflammable gas, lighter than air
2. an inflammable gas, heavier than air
3. a non-flammable gas, heavier than air
4. a non-flammable gas, lighter than air
the transition from gas to liquid is called
1. condensation
2. evaporation
3. melting
4. freezing
the transition from solid to liquid is called
1. melting
2. condensation
3. freezing
4. evaporation
the transition from liquid to solid is called
1. freezing
2. melting
3. evaporation
4. condensation
solids
1. expand slightly when heated
2. expand greatly when heated
3. have particles that are free to move around
4. have particles that move very fast