Describing Chemical Reactions

Front

What does the ARROW mean in a chemical reaction?

Back

The arrow in a chemical reaction means 'yields', indicating the direction of the reaction from reactants to products.

Front

What are the PRODUCTS in the reaction: 2KI + Pb(NO3)2 → PbI2 + 2KNO3?

Back

The products are PbI2 and 2KNO3.

Front

Why is tearing a piece of paper only a physical change?

Back

Tearing a piece of paper is a physical change because it only changes its size, but it remains paper.

Front

Is burning a campfire a chemical or physical change?

Back

Burning a campfire is a chemical change.

Front

Why is burning a campfire a chemical change?

Back

Burning a campfire is a chemical change because it creates a new substance with new properties.

Front

What are reactants in a chemical reaction?

Back

Reactants are the starting substances that undergo a chemical change to form products.

Front

What is a chemical equation?

Back

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

Front

What is the law of conservation of mass?

Back

The law of conservation of mass states that mass is neither created nor destroyed in a chemical reaction.

Front

What is a physical change?

Back

A physical change is a change that affects one or more physical properties of a substance without altering its chemical composition.

Front

What is a chemical change?

Back

A chemical change is a change that results in the formation of new chemical substances.