Evidence of Chemical Reactions

Front

What is evidence of a chemical reaction?

Back

Evidence of a chemical reaction includes changes such as temperature increase, color change, gas production, or formation of a new substance.

Tags

NGSS.MS-PS1-2

Front

What happens to the mass of reactants in a chemical reaction?

Back

The mass of the reactants remains the same as the mass of the products, according to the Law of Conservation of Mass.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Front

What is a chemical equation?

Back

A chemical equation is a symbolic representation of a chemical reaction, showing the reactants on the left and the products on the right.

Tags

NGSS.MS-PS1-1

Front

What indicates a temperature change in a chemical reaction?

Back

A temperature change indicates that energy is either absorbed or released during the reaction.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

NGSS.MS-PS3-5

Front

What is a precipitate?

Back

A precipitate is a solid that forms and settles out of a liquid mixture during a chemical reaction.

Tags

NGSS.MS-PS1-2

Front

What does it mean when a new substance is produced in a reaction?

Back

The formation of a new substance indicates that a chemical change has occurred, resulting in different properties from the original substances.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Front

What is a sign of a physical change?

Back

A loss of transparency is a sign of a physical change, not a chemical change.

Front

What is the role of oxygen in combustion reactions?

Back

Oxygen is a reactant in combustion reactions, allowing substances like coal to burn and produce new products.

Tags

NGSS.MS-PS1-5

Front

What is the significance of color change in a chemical reaction?

Back

A color change can indicate that a chemical reaction has occurred, often due to the formation of new substances.

Tags

NGSS.MS-PS1-2

Front

What are reactants in a chemical equation?

Back

Reactants are the starting materials in a chemical reaction, found on the left side of the equation.

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-5