What is Matter?
What does it mean for matter to be conserved?
A. Matter can be created during a change
B. Matter stays the same total amount during any change
C. Matter disappears during reactions
D. Matter always becomes lighter during heating
B. Matter stays the same total amount during any change.
What happens to the weight of ice when it melts into water?
A. It increases
B. It decreases
C. It stays the same
D. It doubles
C. It stays the same.
When water freezes into ice, its weight:
A. Increases
B. Decreases
C. Stays the same
D. Depends on the temperature
C. Stays the same.
What does dissolving a solid in a liquid show about matter?
A. Matter disappears when dissolved
B. Matter is created during dissolving
C. Matter is conserved because the solid can be recovered
D. Matter weighs less after dissolving
C. Matter is conserved because the solid can be recovered.
Why don’t scientists test the law of conservation of matter every time?
A. It is already proven wrong
B. It only applies to solids
C. It has been observed so many times with no exceptions
D. Scientists do not study changes in matter
C. It has been observed so many times with no exceptions.
How can you check that matter is conserved during a change?
A. Measure the color before and after the change
B. Measure the temperature before and after the change
C. Measure the weight before and after the change
D. Measure the volume before and after the change
C. Measure the weight before and after the change.
Why doesn’t weight change when a substance expands during heating?
A. New particles are added
B. Some particles disappear
C. The number of particles stays the same
D. The particles become heavier
C. The number of particles stays the same.
Why does the weight stay the same when water vapor condenses?
A. The particles get heavier
B. New particles are formed
C. The number of particles stays the same
D. The temperature stays the same
C. The number of particles stays the same.
When sugar and lemon juice dissolve in water to make lemonade, the total weight:
A. The weight of the lemonade is less than the ingredients
B. The sugar and lemon juice lose weight
C. The particles of the ingredients disappear
D. The total weight equals the sum of all ingredients
D. The total weight equals the sum of all ingredients.
Who is credited with demonstrating the law of conservation of matter?
A. Albert Einstein
B. Antoine Lavoisier
C. Isaac Newton
D. Marie Curie
B. Antoine Lavoisier.
What happens to particles of matter during a change?
A. They are created
B. They are destroyed
C. They rearrange, join, or break apart
D. They stop moving
C. They rearrange, join, or break apart.
During boiling, why is water vapor hard to weigh?
A. It becomes heavier than the liquid
B. It mixes with the air and spreads out
C. Scales cannot measure hot substances
D. The vapor disappears when heated
B. It mixes with the air and spreads out
What happens to particles when a substance contracts during cooling?
A. They disappear completely
B. They move farther apart
C. They move closer together but do not disappear
D. New particles form to fill empty space
C. They move closer together but do not disappear.
What happens to the weight of a glow stick before and after it is activated?
A. It increases
B. It decreases
C. It stays the same
D. It triples
C. It stays the same.
How did Lavoisier show that matter is conserved?
A. He proved matter disappears during changes
B. He invented a new form of measuring heat
C. He showed that matter is conserved by weighing substances before and after reactions
D. He created a law that says matter is made of energy
C. He showed that matter is conserved by weighing substances before and after reactions.
Why is the conservation of matter considered a “law”?
A. It only applies to solids and liquids
B. It changes depending on the experiment
C. It has been observed over and over with no exceptions
D. It was recently discovered and not tested much
C. It has been observed over and over with no exceptions.
When wood burns, why does the ash weigh less than the wood?
A. Matter is destroyed during burning
B. Some matter becomes gases that escape into the air
C. Fire removes matter
D. Only solids count toward total weight
B. Some matter becomes gases that escape into the air.
When gelatin cools and solidifies, its weight:
A. Becomes lighter than before
B. Becomes heavier because it is a solid
C. Stays the same as the liquid mixture
D. Doubles since the particles join together
C. Stays the same as the liquid mixture.
When baking soda and vinegar react and form a gas, why does it seem like matter is lost?
A. Baking soda disappears
B. Vinegar evaporates
C. A gas forms and escapes into the air
D. The reaction destroys matter
C. A gas forms and escapes into the air.
If an experiment appears to break the conservation law, what do scientists assume first?
A. He proved matter disappears during changes
B. He invented a new form of measuring heat
C. He showed that matter is conserved by weighing substances before and after reactions
D. He created a law that says matter is made of energy
B. There’s a problem with the experiment.
What is weight a measure of?
A. How fast an object moves
B. How hot or cold a material is
C. The amount of matter in an object
D. The size and shape of an object
C. The amount of matter in an object.
What happens to the total weight of the gases plus ash if you capture all products of burning wood?
A. It becomes less than the original wood
B. It becomes more than the original wood
C. It is equal to the original wood plus the oxygen used
D. It disappears because gases escape
C. It equals the original weight of the wood plus the oxygen used.
When gelatin forms larger particles as it cools, does the weight change?
A. Yes, because the particles become bigger
B. Yes, because some particles disappear
C. No, because the same matter is still present
D. No, because solids don’t have weight
B. No, because the same matter is still present.
Why does dissolved sugar appear to “disappear”?
A. The sugar is destroyed
B. The sugar turns into a gas
C. Its particles spread out among the water particles
D. It loses all of its weight
C. Its particles spread out among the water particles.
When would scientists consider changing the law of conservation of matter?
A. After one experiment shows different results
B. If many experiments repeatedly show matter is not conserved with no errors
C. If students cannot repeat the experiment
D. If a reaction forms a gas
B. If many experiments repeatedly show matter is not conserved with no errors.