8th Unit 2 Test

Front

How many atoms are present if there is no subscript following the element symbol?

Back

1

Front

What does the law of conservation of matter state?

Back

Atoms are neither created nor destroyed in chemical reactions.

Front

How many Oxygen atoms are in the formula Al₂(CO₃)₃?

Back

9

Front

How many atoms are present in caffeine (C₈H₁₀N₄O₂)?

Back

24

Front

What are the substances that start a chemical reaction called?

Back

Reactants

Front

What is the definition of a chemical reaction?

Back

A process where reactants transform into products.

Front

What is a product in a chemical reaction?

Back

The substances formed as a result of a chemical reaction.

Front

What is a reactant in a chemical reaction?

Back

The starting materials that undergo change during a reaction.

Front

What does it mean to balance a chemical equation?

Back

To ensure that the number of atoms for each element is the same on both sides of the equation.

Front

What is the significance of subscripts in a chemical formula?

Back

They indicate the number of atoms of each element in a molecule.