Can I Make New Stuff Out of Old Stuff? IQWST 7 Grade Unit 1 Test

Front

What happens to atoms during a chemical reaction?

Back

Atoms rearrange.

Front

What is produced when carbon dioxide (CO2) and water (H2O) react?

Back

H2CO3 (carbonic acid) is produced.

Front

How can you determine if two liquids are the same substance?

Back

Compare their properties: density, color, mass, and melting point.

Front

What does the Law of Conservation of Mass state?

Back

In a chemical reaction, the number of reactants must equal the number of products.

Front

What indicates that a chemical reaction has occurred?

Back

Evidence includes changes in color, temperature, gas production, or formation of a precipitate.

Front

What is a reactant in a chemical reaction?

Back

A reactant is a substance that undergoes change during a chemical reaction.

Front

What is a product in a chemical reaction?

Back

A product is a substance that is formed as a result of a chemical reaction.

Front

What is the difference between a physical change and a chemical change?

Back

A physical change alters the form of a substance without changing its identity, while a chemical change results in the formation of new substances.

Front

What is an example of a chemical reaction?

Back

Burning wood, where wood reacts with oxygen to produce ash, carbon dioxide, and water.

Front

What is the significance of balancing a chemical equation?

Back

Balancing ensures that the same number of atoms of each element are present on both sides of the equation.