Matter & Changes (8.P.9.1, 9.2, 9.3)

Michael mixes two chemicals together in a beaker. The chemicals change color, and the beaker heats up quickly. What kind of change most likely occurred?

• No change occurred.

• A chemical change occurred.

• A mixture formed.

• Only a physical change occurred.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

When substances go through chemical changes, which of the following will always happen?

• A gas will form or a white solid will precipitate.

• One or more substances will be completely destroyed.

• One or more substances with different chemical properties will form.

• Exactly one new substance will form and one will be destroyed.

Tags

NGSS.MS-PS1-2

Mrs. Clark decides to do a demonstration for her class with a piece of notebook paper. Using a balance, Mrs. Clark discovers that the mass of the paper is 20 g. She then takes the piece of paper and cuts it into several small pieces. The cumulative mass of the small pieces is 20 g. What has Mrs. Clark demonstrated for her class?

• a physical change involving change of mass

• a physical change involving change of shape and size of matter

• a chemical change involving change of mass

• a chemical change involving change of shape and size of matter

A change of _________, such as a liquid changing to a gas, is an example of a physical change.

• charge

• energy

• location

• state

Tags

NGSS.MS-PS1-4

Which of the following statements describes a physical property?

• The substance forms a solid when reacted with silver nitrate.

• The substance has a higher density than water.

• The substance produces an acid when dissolved in water.

• The substance is highly reactive.

Lyle stirs 5.0 grams of salt into a beaker of water. He then adds 15.0 grams of pure iodine to the mixture. If the total mass of the new mixture is 225 grams, what is the mass of the water?

• 205 grams

• 20 grams

• 100 grams

• 200 grams

Tags

NGSS.MS-PS1-5

Cynthia is holding a sheet of paper that has a mass of 2 grams. She tears the sheet of paper into many small pieces. Which of the following is true?

• The sum of the mass of all the pieces of paper is more than 2 grams.

• The sum of the mass of all the pieces of paper is less than 2 grams.

• Each piece of paper has a mass of 2 grams.

• The sum of the mass of all the pieces of paper is 2 grams.

Tags

NGSS.MS-PS1-5

The process that changes a solid directly into a gas is called sublimation. A solid that begins with a mass of 450 g will sublime to give off a gas with a mass of _______ g.

• 450

• 0

• 900

• 45

Tags

NGSS.MS-PS1-5

Vincent combines sodium and chlorine in two different beakers (beaker X and beaker Y). In both beakers, the chemical reaction shown below occurs. If beaker X is kept at room temperature and beaker Y is placed in a refrigerator, then

• the chemical reaction will reverse its direction in beaker Y.

• the chemical reaction will reverse its direction in beaker X.

• the chemical change will occur faster in beaker Y.

• the chemical change will occur faster in beaker X.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-4

NGSS.MS-PS1-5

Which statement describes a physical change?

• Iron combines with oxygen to form rust.

• Lead is heated and becomes more viscous.

• Sodium metal reacts explosively with oxygen.

• Calcium is added to acid and hydrogen gas is produced.

Tags

NGSS.MS-PS1-4