Balancing Chemical Equations

Front

What is a balanced chemical equation?

Back

A balanced chemical equation has the same number of each type of atom on both sides of the equation, indicating that mass is conserved during the reaction.

Front

What does the law of conservation of mass state?

Back

The law of conservation of mass states that mass cannot be created or destroyed in a chemical reaction; it can only change forms.

Front

How do you determine if a chemical equation is balanced?

Back

Count the number of atoms of each element on both sides of the equation. If they are equal, the equation is balanced.

Front

What is a coefficient in a chemical equation?

Back

A coefficient is a number placed in front of a chemical formula in an equation to indicate how many molecules or moles of that substance are involved.

Front

What is the purpose of balancing chemical equations?

Back

Balancing chemical equations ensures that the same amount of each element is present before and after a reaction, reflecting the conservation of mass.

Front

How many hydrogen atoms are in the molecule H₂O?

Back

There are 2 hydrogen atoms in the molecule H₂O.

Front

What is the balanced equation for the reaction of hydrogen and oxygen to form water?

Back

2H₂ + O₂ → 2H₂O.

Front

What is the balanced equation for the reaction of magnesium and hydrochloric acid?

Back

Mg + 2HCl → MgCl₂ + H₂.

Front

How many oxygen atoms are in the molecule (OH)₂?

Back

There are 2 oxygen atoms in the molecule (OH)₂.

Front

What is the balanced equation for the combustion of sulfur dioxide?

Back

2SO₂ + O₂ → 2SO₃.