9 Weeks CSA

A process that leads to the transformation of one set of chemical substances to another

• reactants

• chemical reaction

• substance

• products

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Elements or compounds that can only be separated or combined to make substances with new properties by means of a chemical reaction

• reactants

• chemical reaction

• substance

• products

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

The substances initially involved in a chemical reaction

• reactants

• chemical reaction

• substance

• products

Tags

NGSS.MS-PS1-2

The substance that is yielded from a chemical reaction

• reactants

• chemical reaction

• substance

• products

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

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

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

• a solid block is ice is heated, and it completely melts into a liquid.

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

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

Tags

NGSS.MS-PS1-2

Monica and Andre are investigating the differences between physical and chemical changes. They list their observations in the table.

Which of the following observations did Monica and Andre label incorrectly

• Salt is dissolved in water.

• Water boils, and steam is produced.

• An aluminum can is crushed.

• A sample of wood is burned.

Charlie has to provide an example of a physical change on his science test. Which of the following would be a correct response?

• a sample of dry ice is left out, in room temperature, and turns into a gas.

• Calcium chloride and baking soda are mixed, and the temperature increases.

• Milk curdles are formed when a jug of milk spoils because it is left out of the fridge.

• Baking soda and vinegar are mixed together, and bubbles are formed.

Tags

NGSS.MS-PS1-4

Shauna is making breakfast for her family. During which step of preparing breakfast did Shauna observe a chemical change?

• When she cracked eggs into a bowl and they changed shape

• When she poured milk on cereal and it was no longer dry

• When she squeezed oranges and the juice came out

• When she toasted bread and it turned brown

Tags

NGSS.MS-PS1-2

What happens in a physical change that distinguishes it from a chemical change?

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

• The properties of the substance change for only a short time, but they will return to their original state.

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

• A new substance is produced, but the new substance 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, produce a white solid that settles to the bottom.

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

• Mixture 4: The denser of the two liquids lies below the other, less dense liquid.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5