Chemical Reactions Quiz

What happens every time you light a candle, bake a cake, take a breath, or even think?

• A physical change occurs

• A chemical reaction starts

• Nothing happens

• A biological process begins

How do chemists describe and explain what happens during a chemical reaction?

• By writing chemical equations

• By drawing diagrams

• By conducting experiments

• By using physical models

What is a chemical equation?

• A) A tool used to measure the temperature of a reaction

• B) A basic tool that scientists use to describe what is happening in a chemical reaction

• C) A method to calculate the speed of a reaction

• D) A way to determine the color change in a reaction

What is the general form of a chemical equation?

• A) products → reactants

• B) reactants → products

• C) reactants + products

• D) products + reactants

What is created by replacing the word reactant and product with their chemical names?

• Chemical formula

• Word equation

• Chemical reaction

• Molecular structure

Which of the following is an example of a word equation?

• H2 + O2 -> H2O

• Calcium carbonate + Sulfuric acid -> Calcium sulfate + Carbon dioxide + Water

• Na + Cl -> NaCl

• C6H12O6 + O2 -> CO2 + H2O

What is a chemical equation?

• A) A representation of a chemical reaction using words

• B) A representation of a chemical reaction using chemical formulas

• C) A representation of a chemical reaction using pictures

• D) A representation of a chemical reaction using numbers only

What is a balanced chemical equation?

• An equation where the number of atoms of each element is the same on both sides.

• An equation where the number of molecules is the same on both sides.

• An equation where the number of compounds is the same on both sides.

• An equation where the number of electrons is the same on both sides.

What is the balanced chemical equation for the reaction between calcium carbonate (CaCO₃) and sulfuric acid (H₂SO₄)?

• CaCO₃ + H₂SO₄ → CaSO₄ + CO₂ + H₂O

• CaCO₃ + H₂SO₄ → CaSO₄ + CO + H₂O

• CaCO₃ + H₂SO₄ → CaSO₄ + CO₂ + H₂

• CaCO₃ + H₂SO₄ → CaSO₄ + CO + H₂

How many oxygen atoms are present in the reactants of the balanced chemical equation CaCO₃ + H₂SO₄ → CaSO₄ + CO₂ + H₂O?

• 5

• 6

• 7

• 8