Balancing Chemical Equations (U4)

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 a chemical reaction.

Front

How do you balance a chemical equation?

Back

To balance a chemical equation, adjust the coefficients in front of the compounds to ensure that the number of atoms for each element is equal on both sides.

Front

What is the law of conservation of mass?

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

What does a coefficient in a chemical equation represent?

Back

A coefficient indicates the number of molecules or moles of a substance involved in the reaction.

Front

How many atoms are in the molecule C6H12O6?

Back

C6H12O6 contains 24 atoms: 6 carbon (C), 12 hydrogen (H), and 6 oxygen (O) atoms.

Front

What is the coefficient of H2O in the equation 3H2 + O2 -> 3H2O?

Back

The coefficient of H2O is 3.

Front

What is the purpose of balancing chemical equations?

Back

Balancing chemical equations ensures that the same number of each type of atom is present before and after the reaction, reflecting the conservation of mass.

Front

What is the balanced equation for the reaction of lithium and chlorine?

Back

2Li + Cl2 -> 2LiCl.

Front

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

Back

2 HCl molecules are needed.

Front

Which of the following is a balanced equation: 2H2 + O2 -> 2H2O or 2H2 + O2 -> H2O?

Back

2H2 + O2 -> 2H2O is the balanced equation.