Chemistry Quiz

What is an element?

• A substance that can be broken down by chemical reactions

• A substance that cannot be broken down by chemical reactions

• A mixture of two or more substances

• A type of chemical reaction

What is a compound?

• A single element

• A mixture of gases

• A substance consisting of two or more different elements combined in a fixed ratio

• A type of chemical reaction

Which of the following elements make up 96% of living matter?

• Carbon, oxygen, hydrogen, nitrogen

• Phosphorus, sulfur, calcium, potassium

• Sodium, chlorine, magnesium, iron

• Helium, neon, argon, krypton

What determines the chemical behavior of an atom?

• The number of protons

• The distribution of electrons in the atom’s electron shells

• The atomic mass

• The number of neutrons

What is the atomic number?

• The number of neutrons

• The number of protons

• The sum of protons and neutrons

• The number of electrons

What is a covalent bond?

• The sharing of a pair of valence electrons by two atoms

• The transfer of electrons from one atom to another

• The attraction between oppositely charged ions

• The sharing of protons between two atoms

What is hydrogen bonding?

• A bond between two hydrogen atoms.

• A bond where a hydrogen atom covalently bonds to one electronegative atom and is also attracted to another electronegative atom.

• A bond between two oxygen atoms.

• A bond that forms only in metals.

What are van der Waals interactions responsible for in geckos?

• The ability to change color.

• The ability to walk up walls.

• The ability to swim.

• The ability to fly.

How does the shape of a molecule affect its function in a living cell?

• It determines the color of the molecule.

• It has no effect on the molecule's function.

• It is very important to its function in the living cell.

• It only affects the molecule's weight.

What is a chemical reaction?

• A process where atoms are destroyed.

• A process where chemical bonds are made and broken, leading to changes in the composition of matter.

• A process that only occurs in plants.

• A process that only occurs in animals.