The Chemistry of Life

The forces that holds molecules together are called

• chemical bonds

• forces

• attractions

• atoms

These organic molecules provide energy to cells, store energy, and form body structures of plants.

• Carbohydrates

• Fats

• Lipids

• Nucleic acids

These organic molecules contain instructions for proteins, pass instructions from parents to offspring, help cells to assemble proteins.

• Nucleic Acids

• Proteins

• Lipids

• Fats

These organic molecules help cells keep their shape, make up muscles, and speed up chemical reactions

• Proteins

• Fats

• Lipids

• Fatty Acids

A(n) _______________ is the smallest basic unit of matter.

• element

• atom

• molecule

• compound

A(n) ____________________ is a substance made of atoms of different elements bonded together in a certain ratio.

• compound

• mixture

• molecule

• covalent bond

A(n) ________________ bond formed when atoms share a pair of electrons.

• ion

• ionic

• covalent

• compound

An _____________ is an atom that has gained or lost one or more electrons.

• ionic bond

• electron

• ion

• molecule

Which of the following is formed when an atom gains or losses electrons?

• Element.

• Compound.

• Molecule.

• Ion.

Select all solutions that are acidic.

• A solution with a pH of 8.

• A solution with a pH of 6.

• A solution with a pH of 12.

• A solution with a pH of 3.