Chemistry Basics Quiz

What is a molecule?

• A single atom of an element.

• A combination of atoms bonded together.

• A type of chemical property.

• A change in matter that cannot be reversed.

Which of the following best defines the term "reactant"?

• A substance produced in a chemical reaction.

• A substance that is consumed in a chemical reaction.

• A substance that does not change in a chemical reaction.

• A chemical property that describes how a substance behaves.

What happens in a chemical reaction between H₂ and O₂?

• They produce water (H₂O).

• They produce hydrogen gas (H₂).

• They produce oxygen gas (O₂).

• They create a new atom.

After a chemical reaction occurs, the new substances produced are known as:

• Reactants.

• Properties.

• Molecules.

• Products.

Which of the following is the correct representation of the reaction between hydrochloric acid (HCl) and sodium hydroxide (NaOH)?

• HCl + NaOH → NaCl + H₂O

• HCl + NaOH → NaOH + HCl

• H₂O + NaOH → NaCl + H₂

• NaCl + H₂O → HCl + NaOH

What is a substance?

• A molecule that can react with other molecules.

• Matter that has a specific set of properties.

• A chemical reaction that forms new products.

• A scale used to measure temperature.

What is a property in chemistry?

• A characteristic of a substance that can be observed or measured.

• A substance that cannot be changed in a chemical reaction.

• A part of a chemical reaction that is not visible.

• A reaction that produces energy.

Which of the following is an example of a chemical property?

• Color

• Texture

• Flammability

• Density

Given the reaction: 2H₂ + O₂ → 2H₂O How many molecules of water are produced?

• 1

• 2

• 3

• 4

Which of these options represents a balanced chemical equation?

• 2H₂ + O₂ → 2H₂O

• H₂ + O₂ → 2H₂O

• H₂ + O₂ → H₂O

• 2H₂ + O → H₂O