Unit 3: Chemical Reactions Pre-Assessment 7/8

Front

What is the principle of conservation of mass?

Back

Matter is not created or destroyed in a chemical reaction.

Front

What are reactants in a chemical equation?

Back

The substances that undergo a chemical change, found on the left side of the equation.

Front

What are products in a chemical equation?

Back

The substances that are produced as a result of a chemical reaction, found on the right side of the equation.

Front

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

Back

Both sides of the equation have the same number of atoms of each element.

Front

If a reaction starts with 20g of reactants, what should the total mass of products be?

Back

20g of products.

Front

What is a chemical equation?

Back

A representation of a chemical reaction using symbols and formulas.

Front

What is the difference between coefficients and subscripts in a chemical formula?

Back

Coefficients indicate the number of molecules, while subscripts indicate the number of atoms in a molecule.

Front

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

Back

The total mass remains the same before and after the reaction.

Front

What is an example of a chemical reaction?

Back

Combining vinegar and baking soda to produce carbon dioxide gas.

Front

What is the role of energy in chemical reactions?

Back

Energy is either absorbed or released during a chemical reaction.