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Liquid water is cooled from 25°C to 15°C. What happens to the water particles during the cooling?

• They speed up.

• They slow down.

• They stop moving.

• They remain the same.

A balloon with a mass of 5 grams is blown up and popped. If all the pieces are weighed what would be their total mass?

• 2.5 grams

• 5 grams

• 7.5 grams

• 10 grams

A student is comparing the mass of a model airplane to its parts. She places the completed model airplane on one side of the balance.

Which picture BEST shows the direction of the pointer when the parts are added to the other side of the balance?

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The diagram below compares the movement of water particles when the water is cold compared to when it is hot.

• The particles in the cold water move more slowly.

• The particles in the cold water move more quickly.

• The particles in the cold water move more freely.

• The particles in the cold water do not move at all.

Sam pours 50 grams of salt into 500 grams of water. Which is most likely the total mass of the mixture?

• 550 grams, because mass is not gained or lost when a mixture is

  created

• 555 grams, because some of the salt will react with the water and

  cause an increase in mass

• 545 grams, because some of the salt will evaporate from the water

• 500 grams, because the salt has no mass once it mixes with the

  water

Scientists are observing molecules by using an advanced electron microscope. They notice the molecules are beginning to move faster. What is most likely happening?

• Heat is being added, and a gas is turning into a liquid.

• Heat is being added, and a solid is turning into a liquid.

• Heat is being removed, and a gas is turning into a solid.

• Heat is being removed, and a liquid is turning into a solid.

Jack can split logs without any chips falling from them. He cuts a tree stump into four logs. He then splits each log into two smaller pieces, making a total of eight pieces of wood. Which best explains the mass of the eight pieces of split wood?

• The split wood’s mass is less than the mass of the original stump.

• The split wood’s mass is the same as the mass of the original stump.

• The split wood’s mass is more than the mass of the stump because there are more pieces.

• The mass of the four logs is the same as the original tree stump, but the final mass of the eight pieces is less than the original tree stump.

Dry ice immediately becomes a gas at room temperature. How much will

the contents of 500 g of dry ice, placed in a closed container at room

temperature, weigh after half the dry ice turns into a gas?

• 250 g

• 350 g

• 500 g

• 600 g

Use the balance beam to tell whether the statement below is true or false.The orange is heavier than the grapes.

• True

• False

Mike dissolves some sugar in water and pours 10 ounces of the mixture into a jar with a lid to create rock candy. Which is most likely the weight of the mixture after it crystallizes into rock candy?

• 0 ounces

• 5 ounces

• 10 ounces

• 12 ounces