8E Balancing Equations Review

Front

What do the red numbers in a chemical equation represent?

Back

Coefficients

Front

How many oxygen atoms are in Al₂(SO₄)₃?

Back

12

Front

What do the blue numbers in a chemical equation represent?

Back

Subscripts

Front

Fill in the blanks with coefficients: PCl₅ + _ H₂O → _ HCl + H₃PO₄

Back

4, 5

Front

Is the equation Mg + Cl₂ → MgCl₂ already balanced?

Back

Yes, it is already balanced.

Front

What is a coefficient in a chemical equation?

Back

A coefficient is a number placed in front of a chemical formula 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 number written below and to the right of a chemical symbol that indicates the number of atoms of that element in a molecule.

Front

Balance the equation: _C₃H₈ + _O₂ → _CO₂ + _H₂O

Back

1, 5, 3, 4

Front

What is the purpose of balancing chemical equations?

Back

To ensure that the number of atoms of each element is the same on both sides of the equation, following the law of conservation of mass.

Front

In the equation 2H₂ + O₂ → 2H₂O, what do the numbers 2 represent?

Back

The coefficients indicating the number of molecules of each reactant and product.