Physical Science 4.10

Multiple Choice

Which of the following best describes the purpose of balancing a chemical equation?

• To ensure the number of atoms for each element is the same on both sides

• To make the equation look more organized

• To change the substances involved in the reaction

• To increase the speed of the reaction

Open Ended

How do chemical equations represent chemical reactions?

Fill in the Blanks

Fill in the blank: The law of

states that mass is neither created nor destroyed in a chemical reaction.

Multiple Select

Select all correct steps in balancing a chemical equation.

• Write down the skeletal chemical equation

• Make a list of each type of atom

• Ignore subscripts

• Multiply the coefficient & subscript to determine total number of atoms

Multiple Choice

What is the purpose of using the conservation of mass when balancing chemical equations?

• To create new atoms

• To ensure the number of atoms is equal on both sides

• To change the chemical properties

• To ignore the coefficients

Multiple Choice

Which step is NOT part of balancing a chemical equation?

• Write down the skeletal chemical equation

• Make a list of each type of atom

• Add random coefficients without checking atom counts

• Multiply the coefficient & subscript to determine total number of atoms

Multiple Select

Which of the following symbols provide additional information in a chemical equation?

• (g) for gas

• (aq) for aqueous

• Δ for heating

• (m) for mixture

Fill in the Blanks

The balanced equation for potassium and chlorine gas combining to form potassium chloride is ___K + Cl2 → ___KCl.

Multiple Choice

In the balanced equation 2H2(g) + 2NO → 2H2O + N2(g), how many molecules of nitrogen monoxide (NO) are required to react with hydrogen gas?

• 1

• 2

• 3

• 4

Open Ended

What is one challenge you faced while learning to balance simple chemical equations, and how did you overcome it?