Unit 1 Chemical Changes Assessment

What is the chemical symbol for magnesium?

• 12

• Mg

• Magnesium

• 24.31

Compounds are different than elements because compounds are -

• combinations of two or more elements

• not able to be broken down into parts

• made from the same type of atom

• a pure substance, elements are not

The smallest particle of any particular type of matter is known by which of the following terms?

• element

• chemical

• atom

• compound

Which of the following is an example that includes evidence of a chemical change?

• A sample of zinc in placed in water and settles to the bottom.

• A solid block of ice is heated and completely melts into water.

• Sugar that is burned gives off an odor and turns brown then black.

• A sample of a mineral is broken into smaller pieces.

Tags

NGSS.MS-PS1-2

The image shows what happens when cold tablets are placed in water.

What evidence would indicate that a chemical change has occurred?

• The tablets dissolve in water.

• The water becomes cloudy.

• The water level increases slightly.

• Bubbles are given off.

Tags

NGSS.MS-PS1-2

A physical change can be distinguished from a chemical change because this happens in a physical change-

• The properties of the substance may change, but no new substance is produced.

• The properties change only for a short time but then return to their state.

• An entirely new substance with different properties forms as a result the change.

• A new substance is produced but has properties identical to the original substance.

Tags

NGSS.MS-PS1-2

Four mixtures are made by combining two clear liquids and observations are made. Which mixture demonstrates that a chemical change has occurred?

• Mixture 1: The combined liquids have a greater mass than either of the starting liquids.

• Mixture 2: The liquids, when mixed, produced a white solid that settles to the bottom.

• Mixture 3: The mixture of the two liquids takes the shape of its container.

• Mixture 4: The more dense liquid lies below the less dense liquid.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

What happens to the atoms in a substance during a chemical change?

• The atoms stay the same, keeping their properties.

• The atoms rearrange producing a substance that wasn't there before with different properties.

• The atoms transfer their properties to other atoms.

• The atoms keep some of their properties and transfer some to other atoms.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Place a checkmark next to all the signs that a chemical change has occurred.

• Bubbles/fizzing

• Change in temperature

• Formation of a Precipitate

• Physical properties stay the same

• Atoms rearrange

Tags

NGSS.MS-PS1-2

What is the difference between a physical change and a chemical change? You must include an example of each.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS1-5