Signs of Chemical Reactions

Front

Did a chemical reaction occur when CHEMICAL A and CHEMICAL B are combined and crystals form?

Back

Yes

Front

A change in the shape of an object is an example of _________________.

Back

a physical change.

Front

Action to demonstrate a chemical change: cutting a piece of paper, folding a piece of paper, tearing a piece of paper, burning a piece of paper

Back

burning a piece of paper

Front

What describes a precipitate?

Back

A solid forms when one liquid is poured into another.

Front

What is a chemical reaction?

Back

a change in matter when the molecules rearrange to make new molecules

Front

How is a chemical change different from a physical change?

Back

A chemical change creates a new substance.

Front

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

Back

A gas is formed.

Front

Which example is a chemical change?

• baking powder fizzing
• ice melting
• water boiling
• sugar cube dissolving

Back

baking powder fizzing

Front

Which scientific observation, shown in the chart, indicates that a chemical reaction has NOT occurred?

Back

Number 3

Tags

112.27.b.6.C

Front

Indicators of a chemical reaction: formation of a new solid (precipitate), change in color, shift in temperature.

Back

All of these are valid indicators of a chemical reaction.

Tags

S8P1