Counting Atoms Practice

Front

What are reactants in a chemical equation?

Back

Reactants are the substances that undergo a chemical change in a reaction, found on the left side of a chemical equation.

Front

In the equation 2H₂ + O₂ → 2H₂O, what are the reactants?

Back

The reactants are 2H₂ + O₂.

Front

How many elements are in the compound C₂H₈O?

Back

There are 3 elements: Carbon (C), Hydrogen (H), and Oxygen (O).

Front

How many Chlorine (Cl) atoms are in MgCl₂?

Back

There are 2 Chlorine (Cl) atoms.

Front

What does the arrow in a chemical equation represent?

Back

The arrow represents 'makes' or 'produces', indicating the direction of the reaction.

Front

What is a coefficient in a chemical equation?

Back

A coefficient is a number placed in front of a compound to indicate how many molecules or atoms are involved in the reaction.

Front

What is a subscript in a chemical formula?

Back

A subscript is a small number written to the right of an element symbol that indicates the number of atoms of that element in a molecule.

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 product in a chemical equation?

Back

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

Front

How do you determine the number of atoms in a molecule?

Back

Count the number of atoms for each element based on the subscripts in the chemical formula.