Quiz on Basic Chemistry Concepts

What is the smallest unit of matter that makes up everything around us?

• Molecule

• Element

• Atom

• Compound

What is a group of two or more atoms bonded together called?

• Element

• Molecule

• Compound

• Atom

What is a pure substance made of only one type of atom?

• Compound

• Molecule

• Element

• Atom

What is a substance made of two or more different types of atoms bonded together?

• Element

• Molecule

• Compound

• Atom

What is an extended structure?

• A small, random arrangement of atoms or molecules.

• A large, repeating pattern of connected atoms or molecules, like in a crystal or metal.

• A single atom or molecule.

• A temporary arrangement of atoms.

What defines a crystal?

• A liquid material with random atom arrangement.

• A solid material where the atoms or molecules are arranged in a repeating, organized pattern.

• A gas with scattered molecules.

• A material with no definite shape.

What is a pure substance?

• A mixture of different types of atoms or molecules.

• A material that is made of only one type of atom or molecule and has the same properties throughout.

• A substance with varying properties.

• A combination of solids and liquids.

What is a chemical bond?

• A force that holds atoms together in a molecule.

• A space between atoms.

• A type of atom.

• A random connection between molecules.

What is a chemical change (reaction)?

• A process where substances change into new substances with different properties.

• A process where substances remain the same.

• A process where substances are mixed but not changed.

• A process where substances are dissolved in water.

What are reactants in a chemical reaction?

• The starting substances in a chemical reaction.

• The substances that are made in a chemical reaction.

• The substances that are dissolved in a chemical reaction.

• The substances that are heated in a chemical reaction.