Chemical Reactions

Front

Which example provides evidence of a chemical change?

• Wood releases ash and smoke when burned.
• Rock particles separate when soil is being sifted.
• Boiling water bubbles when being heated.
• Sugar is not visible when dissolved in water.

Back

Wood releases ash and smoke when burned.

Front

Which example represents the formation of a precipitate?

Back

White chunks form when you add vinegar to milk or heavy cream.

Front

What evidence demonstrates that a chemical change has occurred when vinegar and baking soda are combined?

Back

A gas is formed.

Front

Which processes from the table can be used as evidence to identify the formation of a new substance? Options: Processes A, B, C, and D; Processes B, C, E, and F; Processes B, C, D, and F; Processes C, D, E, and F

Back

Processes B, C, E, and F

Front

Which investigations provide supporting evidence that a new substance formed?

Back

Investigations 1, 3, and 5

Front

What caused the white cloud and burning eyes after pouring liquids down the sink?

Back

A chemical change occurred resulting in the formation of a new substance.

Front

Observations from which investigations provide evidence that a new substance was formed? Options: Stations 1, 3, 4, and 5; Stations 2, 5, and 6; Stations 1, 3, and 4; Stations 1, 2, 3, and 4.

Back

Stations 1, 3, and 4

Front

Why are the characteristics of table salt different from sodium and chlorine?

Back

When sodium and chlorine combine, a chemical change occurs and a new substance is formed.

Front

Which students’ observations indicate that a new substance formed as a chemical change occurred?

Options: Student A and Student C, Student B and Student C, Student A and Student D, Student B and Student D

Back

Student B and Student C

Front

Why do the ingredients in brownies change after baking?

Back

A chemical change occurred.