The Chemical Level of Organization 50 question practice test

Multiple Choice:

1. The smallest unit of matter that retains the properties of an element is called a:
A. Molecule
B. Atom
C. Ion
D. Compound
2. Which subatomic particle has a positive charge?
A. Electron
B. Neutron
C. Proton
D. Ion
3. Which subatomic particle has no charge?
A. Electron
B. Proton
C. Neutron
D. Ion
4. Which subatomic particle is negatively charged?
A. Proton
B. Neutron
C. Electron
D. Nucleus
5. The atomic number represents the number of:
A. Neutrons
B. Electrons only
C. Protons
D. Protons + neutrons
6. Mass number equals:
A. Protons only
B. Neutrons only
C. Protons + neutrons
D. Protons + electrons
7. An ion is an atom that:
A. Has no neutrons
B. Has lost or gained electrons
C. Has no electrons
D. Has no protons
8. A positively charged ion is called a:
A. Anion
B. Cation

, C. Proton
D. Neutron
9. A negatively charged ion is called a:
A. Cation
B. Anion
C. Proton
D. Electron
10. Ionic bonds form between:
A. Two positive atoms
B. Two negative atoms
C. Oppositely charged atoms
D. Neutral atoms
11. Covalent bonds involve:
A. Transfer of electrons
B. Sharing of electrons
C. Loss of electrons
D. Gain of neutrons
12. The most common bond in the human body is:
A. Ionic
B. Hydrogen
C. Covalent
D. Nuclear
13. Hydrogen bonds are:
A. Stronger than covalent bonds
B. Equal to ionic bonds
C. Weaker than covalent bonds
D. Nuclear bonds
14. Hydrogen bonds help maintain the shape of:
A. Water only
B. Proteins and DNA
C. Only carbohydrates
D. Only lipids
15. A molecule is defined as:
A. Single atom
B. Two or more atoms sharing electrons
C. Charged particle
D. Only organic substances
16. A compound is:
A. One atom
B. Multiple atoms of same element