Biochemistry Test Review

The space surrounding the nucleus of an atom contains which of the subatomic particles?

• protons

• electrons

• neutrons

• ions

• all of the above.

When an atom loses electrons, it forms an ion of what charge?

• negative

• positive

• neutral

• it could be positive or negative.

If a substance like sugar dissolves in water, sugar would be the:

• solvent

• solute

• reactant

• ion

• heterogeneous solution.

The nucleus of an atom is composed of:

• protons and electrons

• protons and neutrons

• neutrons and electrons

• protons, neutrons and electrons.

Tags

NGSS.HS-PS1-8

A substance formed by the combination of two or more elements in a definite proportion is called a(n):

• mixture

• solution

• compound

• atom

• ion.

Tags

NGSS.MS-PS1-1

Covalent bonds are formed when:

• electrons are shared between two atoms

• electrons are transferred from one atom to another atom

• protons are shared between two atoms

• protons are exchanged from one atom to another atom.

Which one of the following is true of the polarity of water?

• The oxygen atom is slightly positive, and the hydrogen atom is slightly negative.

• Both the oxygen and the hydrogen atoms are slightly positive.

• Both the oxygen and the hydrogen atoms are slightly negative.

• The oxygen atom is slightly negative, and the hydrogen atom is slightly positive.

When water dissolves a substance and forms a solution, water is considered to be the:

• solvent

• solute

• suspension

• mixture

• reactant.

A bond that is formed between the oxygen atom of one water molecule and the hydrogen atom of a different water molecule is called a(n):

• ionic bond

• covalent bond

• hydrogen bond

• metallic bond

• it could be ionic or covalent.

The basic unit of matter is:

• a compound

• an element

• a mixture

• an atom.

Tags

NGSS.HS-PS1-7