Reactions

Front

What are reactants in a chemical reaction?

Back

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

Front

In the equation 2Mg + O2 -> 2MgO, identify the reactants.

Back

Mg and O2 are the reactants.

Front

What does it mean for a chemical equation to be balanced?

Back

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

Front

Which of the following is a balanced equation? PbO2 + 2H2 -> H2SO4, SO2 + H2O -> H2SO4, 2Na + 2H2O -> 2NaOH + H, 2Na + 2H2O -> 2NaOH + H2

Back

2Na + 2H2O -> 2NaOH + H2 is balanced.

Front

How do you balance the equation CF4 + Br2 -> CBr4 + F2?

Back

The balanced equation is 1CF4 + 2Br2 -> 1CBr4 + 2F2.

Front

What is the purpose of balancing chemical equations?

Back

Balancing chemical equations ensures the conservation of mass, meaning atoms are neither created nor destroyed.

Front

How many HCl molecules are needed to balance the equation Mg + __HCl -> MgCl2 + H2?

Back

2 HCl molecules are needed to balance the equation.

Front

What happens to the molecules in a substance when it undergoes a chemical reaction?

Back

The molecules rearrange to form new substances.

Front

What is a product in a chemical reaction?

Back

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

Front

Define a chemical equation.

Back

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