Evidence of Chemical Reactions

Front

What is evidence of a chemical reaction?

Back

Evidence of a chemical reaction includes changes such as color change, temperature change, gas production, and the formation of a precipitate.

Front

What are the signs that a chemical reaction has occurred?

Back

Signs include: 1) Color change, 2) Gas production (bubbles), 3) Temperature change (exothermic or endothermic), 4) Formation of a precipitate.

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; the total mass of reactants equals the total mass of products.

Front

What are reactants in a chemical reaction?

Back

Reactants are the starting substances that undergo a chemical change in a reaction.

Front

What are products in a chemical reaction?

Back

Products are the substances formed as a result of a chemical reaction.

Front

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

Back

The mass of the reactants remains the same as the mass of the products due to the law of conservation of mass.

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 does the arrow in a chemical equation represent?

Back

The arrow in a chemical equation represents the direction of the reaction, indicating that reactants are transformed into products.

Front

What is a precipitate?

Back

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

Front

What is an example of a physical change?

Back

Chopping a tomato into smaller pieces is a physical change, as it does not alter the chemical composition of the tomato.