WorksheetsGRADE 6 - CHEMISTRY - CHAPTER 1 - REVISION
Total questions: 117
Worksheet time: 59mins
What are all materials made of?
Atoms
Particles
Mixtures
Compounds
What is the name of a material made of a single type of particle?
Mixture
Substance
Solution
Alloy
How many particles make up one grain of sugar approximately?
1 million
1 billion
1 trillion
1 quadrillion
Which of the following is an example of a substance?
Wood
Soil
Pure water
Rock
Why do different substances have different properties?
Due to differences in size
Due to differences in particles
Due to differences in weight
Due to differences in shape
What does the particle model describe?
Movement and arrangement of particles in a substance
The density of particles
The temperature of particles
The weight of particles
What explains why silver is easier to scratch than diamond?
Silver has more particles than diamond
Particles in silver hold together less strongly
Silver particles are closer together
Silver particles are heavier
What determines the weight of a material?
Size of the particles
Mass of the particles
Density of the particles
Arrangement of the particles
Why does a gas take the shape of its container?
Its particles are fixed
Its particles move fast and spread out
Its particles are tightly packed
Its particles are large
How do liquid water particles move?
Vibrate in one position
Slide over each other randomly
Move in fixed patterns
Do not move
What happens to particle movement as temperature increases?
They move slower
They stop moving
They move faster
They move closer
How are particles in solids arranged?
Randomly arranged
In a fixed pattern, touching each other
Spread far apart
Vibrating in random positions
Which factor does NOT affect the properties of a substance?
How particles move
The attraction between particles
Particle arrangement
The temperature of particles
Why do gases expand to fill their containers?
Gas particles are large and fixed in place
Gas particles move freely in all directions
Gas particles attract each other strongly
Gas particles are tightly packed
Which material has particles that are harder to compress?
Solid
Liquid
Gas
Plasma
What causes substances to change state?
Changes in the size of particles
Changes in particle energy and arrangement
Breaking apart of particles
Changes in the number of particles
What happens to particles in a solid when it is heated?
They stop moving
They vibrate faster
They move closer together
They lose energy
Why does a liquid have a definite volume but not shape?
Its particles are tightly packed and fixed
Its particles are close together but can slide over each other
Its particles are far apart
Its particles are stationary
Why do gases have no fixed shape or volume?
Particles are fixed in position
Particles are spread out and move randomly
Particles are tightly packed
Particles are bonded tightly
What happens when liquid mercury freezes?
Its particles move faster
Its particles vibrate in a fixed position
Its particles move apart
Its particles become less dense
Which state of matter has the strongest particle attraction?
Solid
Liquid
Gas
Plasma
How does a vacuum differ from a gas?
A vacuum has large particles
A vacuum has no particles at all
A vacuum has randomly arranged particles
A vacuum has tightly packed particles
What happens to particles when gas is compressed?
They get smaller
They get closer together
They stop moving
They expand
Why does ice float on water?
Ice particles are heavier
Ice particles are less dense
Ice particles are randomly arranged
Ice particles have less attraction
Why does liquid water take the shape of its container?
Water particles move randomly and slide past each other
Water particles are fixed in place
Water particles are far apart
Water particles vibrate in place
Why does solid mercury not flow?
Its particles are tightly packed and cannot slide
Its particles move randomly
Its particles have no attraction
Its particles are far apart
What is the difference between solid and gas particle motion?
Solid particles move faster than gas particles
Solid particles vibrate in place, gas particles move freely
Solid particles slide past each other, gas particles are stationary
Solid particles are less dense than gas particles
What causes steam to occupy more space than liquid water?
Steam particles are larger
Steam particles are farther apart
Steam particles attract more strongly
Steam particles are less dense
What explains why gold is heavier than copper of the same size?
Gold particles are denser than copper particles
Gold particles are smaller than copper particles
Gold particles are arranged randomly
Gold particles vibrate faster
Why is silver easier to scratch than diamond?
Silver particles are denser
Silver particles hold together less strongly
Silver particles are more compact
Silver particles vibrate more slowly
What is the change of state from solid to liquid called?
Freezing
Melting
Evaporation
Condensation
What is the change of state from liquid to gas at boiling point called?
Melting
Evaporation
Boiling
Condensation
What is the change of state from gas to liquid called?
Boiling
Evaporation
Freezing
Condensation
During melting, what happens to the particles of a substance?
They vibrate in fixed positions
They move faster and slide over each other
They move farther apart and stop interacting
They stop moving completely
Which process explains why clothes dry when water evaporates?
Condensation
Evaporation
Freezing
Boiling
What happens to particles during condensation?
They move faster and spread apart
They move closer together and slow down
They stop moving completely
They expand and form patterns
Why does boiling occur at a specific temperature?
Particles in the liquid gain enough energy to escape as gas
Particles in the liquid freeze
Particles in the liquid vibrate in fixed positions
Particles in the liquid move slower
What happens to the particles of a gas when it condenses into a liquid?
They move faster and spread apart
They move closer together and lose energy
They stop moving completely
They expand into a solid
What explains why ice melts into liquid water?
Heat causes the particles to vibrate and slide over each other
Heat causes the particles to freeze in fixed positions
Heat causes the particles to move farther apart
Heat removes energy from the particles
Which of the following processes involves particles leaving the surface of a liquid?
Boiling
Melting
Evaporation
Freezing
At what temperature does water boil?
0°C
50°C
78°C
100°C
What happens to the temperature of a substance during melting?
It increases steadily
It decreases steadily
It stays constant
It fluctuates randomly
Why is evaporation different from boiling?
Evaporation happens at boiling point
Evaporation happens at any temperature
Evaporation requires rapid heating
Evaporation only happens in solids
Which change of state happens below boiling point?
Boiling
Evaporation
Freezing
Melting
What happens to the particles of a liquid during boiling?
They stop moving
They move slower and arrange in patterns
They move faster and spread out
They vibrate in place
What determines the boiling point of a substance?
The size of its particles
The strength of attraction between particles
The mass of its particles
The temperature of its surroundings
Why does nitrogen exist as a gas at room temperature?
It has a low boiling point (-196°C)
It has a high boiling point (100°C)
It has strong particle attractions
It is denser than other gases
What is the change of state from liquid to solid called?
Melting
Freezing
Evaporation
Condensation
During freezing, what happens to the arrangement of particles?
They become random
They arrange in a fixed pattern
They move faster and spread apart
They stop interacting
Why does boiling water form bubbles?
Bubbles are liquid water trapped inside
Bubbles are gas particles escaping the liquid
Bubbles are solid particles forming in water
Bubbles are random clumps of particles
What is the melting point of water?
-210°C
0°C
30°C
169°C
How does particle movement explain evaporation?
Slower particles leave the surface of the liquid
Faster particles leave the surface of the liquid
All particles stop moving during evaporation
Particles freeze before evaporation
Why does diamond have the highest boiling point?
It has heavy particles
Its particles are strongly bonded together
It has random particle arrangements
Its particles are tightly packed in liquid form
What is the boiling point of ethanol?
-102°C
78°C
100°C
357°C
Which of the following is a reversible change of state?
Melting and boiling
Boiling and evaporation
Melting and freezing
Condensation and freezing
What happens to particles during melting?
They gain energy and vibrate faster
They lose energy and vibrate slower
They move randomly and far apart
They arrange into fixed positions
How does a substance's melting point help identify it?
All substances have the same melting point
Substances have unique melting points
Melting points vary with particle size
Melting points depend on shape
What is the state of nitrogen at -100°C?
Solid
Liquid
Gas
Plasma
What happens to particles during freezing?
They lose energy and move into fixed positions
They gain energy and move apart
They vibrate faster and form bubbles
They move freely in all directions
Why is the boiling point of mercury higher than ethanol?
Mercury particles are farther apart
Mercury particles attract each other more strongly
Mercury particles vibrate faster
Mercury particles are less dense
What are the three states of matter?
Solid, liquid, vapor
Solid, liquid, gas
Ice, water, steam
Plasma, vapor, liquid
Which property of a solid remains constant unless force is applied?
Shape
Volume
Weight
Density
What determines whether a substance flows?
Density of the particles
Movement of particles
Weight of particles
Shape of particles
What does the table represent in the states of matter section?
Temperature differences
Physical properties of solids, liquids, and gases
Chemical composition of substances
Melting and boiling points
How do particles in a gas behave compared to those in a liquid?
Gas particles vibrate; liquid particles are stationary
Gas particles move faster and are farther apart
Gas particles are more compact than liquid particles
Gas particles slide over each other
What happens to the shape of a gas in a container?
It takes the shape of the bottom of the container
It takes the shape of the entire container
It retains its original shape
It flows to the bottom
In which state can particles not move freely?
Solid
Liquid
Gas
Plasma
What happens to particles when a solid is compressed?
They get larger
They vibrate more
They compress only slightly
They move apart
Why can liquids be compressed only slightly?
Particles are tightly packed but can slide past each other
Particles are far apart and move randomly
Particles are rigid and fixed in position
Particles are bonded together strongly
Which state has particles vibrating in fixed positions?
Gas
Liquid
Solid
Plasma
What does a solid's shape depend on?
Arrangement of its particles
Speed of particle movement
Separation of particles
Temperature
Which state of matter has particles in random arrangement but still touching?
Solid
Liquid
Gas
Vapor
Which state is the most difficult to compress?
Solid
Liquid
Gas
Plasma
Which state of matter has particles that move in all directions at high speeds?
Solid
Liquid
Gas
Plasma
Which of the following cannot flow?
Gas
Liquid
Solid
Plasma
What happens to the particles of a substance when it changes state?
They change size
They change arrangement and energy
They stop moving
They become more tightly packed
Which of the following is NOT a characteristic of gases?
Particles are close together
Particles move freely in all directions
Particles are far apart
Particles can be compressed
Why is liquid water less dense than ice?
Water particles are heavier
Water particles are closer together
Water particles have weaker attractions
Ice particles form a regular structure
Why can gases be compressed more easily than solids or liquids?
Gas particles are larger
Gas particles are far apart
Gas particles are stationary
Gas particles vibrate in place
Which state allows a substance to flow but retain a constant volume?
Solid
Liquid
Gas
Plasma
What happens to particle movement when a gas is cooled?
Particles move faster
Particles slow down
Particles vibrate more
Particles expand
In which state are particles touching but not in a fixed pattern?
Solid
Liquid
Gas
Plasma
Why do gases expand to fill a container?
Particles are tightly packed
Particles move rapidly in all directions
Particles vibrate in fixed positions
Particles are randomly arranged
Why do liquids take the shape of their container?
Particles are in fixed positions
Particles are free to move and slide over each other
Particles have no attraction
Particles are far apart
Which state has the strongest forces between particles?
Solid
Liquid
Gas
Plasma
Why do solids maintain their shape?
Particles move freely in all directions
Particles are tightly packed in fixed positions
Particles vibrate rapidly
Particles are randomly arranged
What happens to particles during freezing?
They stop moving completely
They slow down and arrange into fixed positions
They move apart and spread out
They lose mass
Which state of matter has the lowest energy particles?
Solid
Liquid
Gas
Plasma
What property allows liquids to flow but not gases?
Close particle arrangement
High particle speed
Weak attraction between particles
Random particle arrangement
Why are gases easier to compress than liquids?
Gas particles are denser
Gas particles are farther apart
Gas particles are heavier
Gas particles vibrate more
Why is solid carbon dioxide used to keep vaccines cold?
It has a low boiling point
It sublimates directly into gas
It melts into liquid at -78°C
It can be compressed easily
What is the difference between evaporation and boiling?
Evaporation happens only at boiling point
Boiling occurs throughout the liquid; evaporation occurs at the surface
Boiling occurs below boiling point
Evaporation happens in all states
What is the main characteristic of a vacuum?
It contains gas particles only
It contains no particles at all
It contains only solids and liquids
It contains vibrating particles
Why does water evaporate faster on a hot day?
The particles move faster with more energy
The particles stop interacting completely
The particles vibrate in fixed positions
The particles expand randomly
What is condensation?
Liquid turning into gas
Gas turning into liquid
Solid turning into liquid
Liquid turning into solid
Why does boiling water reach a constant temperature?
Particles stop moving
Energy is used to break particle bonds instead of heating
Energy is used to freeze particles
Particles vibrate slower
What determines whether a substance is solid, liquid, or gas at a given temperature?
Its mass
Its boiling and melting points
Its density
Its volume
What happens to the energy of particles during freezing?
They gain energy and move faster
They lose energy and arrange into fixed positions
They vibrate in place with more energy
They stop moving completely
Which state of matter is the least dense?
Solid
Liquid
Gas
Plasma
Why does liquid mercury take the shape of its container?
Its particles move randomly and slide over each other
Its particles are in fixed positions
Its particles expand when heated
Its particles vibrate without moving
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