Reactions test November 20

Front

What is a coefficient in a chemical equation?

Back

A coefficient is a number in front of a chemical formula that indicates how many molecules or atoms of each reactant and product are involved in a reaction.

Front

Which of the following represents a balanced chemical equation?

Back

2Na + 2H₂O → 2NaOH + H₂ is balanced.

Front

What happens when sugar dissolves in warm water?

Back

This is a physical change, as the sugar does not create a new substance.

Front

What is the general reaction scheme for a decomposition reaction?

Back

AB → A + B is the general scheme for a decomposition reaction.

Front

What defines a chemical change?

Back

A chemical change creates a new substance and cannot be undone.

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 but does not change its chemical composition, while a chemical change results in the formation of new substances.

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 balanced equation?

Back

A balanced equation has the same number of each type of atom on both sides of the equation.