4.2 Net Ionic Equations

Multiple Choice

Which of the following best describes the purpose of a net ionic equation?

• To show only the ions and molecules directly involved in a chemical reaction

• To list all reactants and products, including spectator ions

• To balance the number of atoms on both sides of the equation

• To show the physical states of all substances involved

Open Ended

Why is it important to represent changes in matter using net ionic equations?

Multiple Choice

Which of the following statements best describes a chemical equation?

• A chemical equation represents a physical change.

• A chemical equation shows the rearrangement of atoms into new combinations.

• A chemical equation must have unequal numbers of atoms on both sides.

• A chemical equation demonstrates that energy is always released.

Open Ended

Explain how the law of conservation of mass is demonstrated in a balanced chemical equation.

Multiple Select

Which of the following are correct representations of the states of matter in a chemical equation?

• (aq) for aqueous

• (g) for gas

• (l) for liquid

• (m) for molten

Fill in the Blanks

Fill in the blank: The atoms that are diatomic in their natural state can be remembered using the acronym

Multiple Choice

What is the first step in balancing a chemical equation using the guess and check method?

• Count the atoms on each side of the equation

• Write out the equation

• Change a coefficient to make one element correct

• Compare the counts

Open Ended

Describe the difference between a total ionic equation and a net ionic equation, using the example provided.

Multiple Choice

Which of the following ions should always be written as their ions in an overall ionic equation?

• Sodium, potassium, ammonium, and nitrate

• Calcium, magnesium, and sulfate

• Iron, copper, and phosphate

• Chloride, bromide, and iodide

Open Ended

Why is it important to cancel out spectator ions when writing a net ionic equation?

Fill in the Blanks

A spectator ion is one that isn’t involved in the reaction and stays the same

throughout.

Multiple Choice

Which of the following are spectator ions in the reaction between Pb(NO3)2 and NaCl?

• Na+ and NO3-

• Pb2+ and Cl-

• Na+ and Cl-

• Pb2+ and NO3-

Open Ended

Explain the difference between an overall ionic equation and a net ionic equation using the precipitation reaction of Pb(NO3)2 and NaCl as an example.

Multiple Choice

What is the main purpose of using a net ionic equation in chemistry?

• To show only the ions and molecules directly involved in a chemical reaction

• To list all reactants and products, including spectator ions

• To balance the number of atoms on both sides of the equation

• To represent only physical changes in matter

Open Ended

Summarize how a net ionic equation represents changes in matter, and explain why it is important in understanding chemical reactions.