Chemistry of Life Quiz

Which phrase best describes atoms?

• single-celled organism

• smallest basic units of matter

• parts of a nucleus

• positively charged particles

Which of the following cannot be broken down by ordinary chemical means?

• element

• compound

• molecule

• bond

What is a compound?

• two atoms of a single element bonded together

• atoms of different elements bonded together in certain ratios

• separate atoms of multiple elements in varying ratios

• a molecule of two oxygen atoms

An ion is formed when an atom gains or loses

• protons

• neutrons

• bonds

• electrons

Atoms connected by covalent bonds share

• pairs of electrons

• ionic compounds

• carbon and oxygen

• hydrogen ions

Hydrogen bonds can form between regions of polar molecules that are

• nonpolar

• negatively charged

• oppositely charged

• uncharged (neutral)

The attraction among molecules of different substances is called

• cohesion

• adhesion

• specific heat

• surface tension

A solution with a high concentration of hydrogen ions.

• shows a pH of 7.

• kills all organisms.

• has a high pH.

• is very acidic.

Which of the following phrases best describes a solvent?

• has a high concentration of solutes

• can be dissolved by the solute

• present in a greater concentration than solutes

• usually a sugar or a protein

How do the isotopes of hydrogen differ?

• in the number of protons

• in the number of electrons

• in the number energy levels

• in the number of neutrons