Understanding Unbalanced Chemical Equations

What is the primary purpose of a chemical equation?

• To use chemical formulas and symbols to describe a chemical reaction

• To illustrate the energy changes in a reaction

• To show the color changes during a reaction

• To describe the physical state of substances

In a chemical equation, what does the arrow symbol typically represent?

• Equals

• Addition

• Subtraction

• Yields or produces

What are the substances on the left side of a chemical equation called?

• Inhibitors

• Reactants

• Catalysts

• Products

When writing a chemical equation, why is it important to use a periodic table of ions?

• To find the atomic mass of elements

• To determine the color of the elements

• To identify the ionic charges of elements

• To calculate the density of elements

What is the chemical formula for sodium chloride?

• Na2Cl

• NaCl2

• Na2Cl2

• NaCl

In the reaction between sodium phosphate and calcium phosphate, what is the state of calcium phosphate?

• Aqueous

• Liquid

• Solid

• Gas

What is the chemical formula for sulfur dioxide?

• SO3

• S2O3

• SO2

• S2O

Which of the following is a diatomic molecule?

• Helium

• Oxygen

• Carbon

• Sulfur

What is the product when aluminum reacts with hydrochloric acid?

• Aluminum oxide

• Aluminum chloride

• Aluminum sulfate

• Aluminum nitrate

What is the state of hydrogen gas in a chemical equation?

• Aqueous

• Gas

• Liquid

• Solid