Chemistry Basics Pretest Key Name ______________________________________
1. Which of the following best describes atoms?
a. Single celled organisms
b. Smallest basic units of matter
c. Parts of a nucleus
d. Positively charged particles
2. Which of the following cannot be broken down by ordinary chemical means?
a. Element
b. Molecule
c. Compound
d. Bond
3. An ion is formed when an atom gains or loses:
a. Protons
b. Neutrons
c. Bonds
d. Electrons
4. Atoms connected by covalent bonds share:
a. Pairs of electrons
b. Ionic compounds
c. Carbon and oxygen
d. Hydrogen ions
5. Chemical reactions change substances into different substances by:
a. Conserving matter between the substances
b. Breaking and forming chemical bonds
c. Strengthening electrical charges of substances
d. Changing a solute into a solvent
1. Which of the following best describes atoms?
a. Single celled organisms
b. Smallest basic units of matter
c. Parts of a nucleus
d. Positively charged particles
2. Which of the following cannot be broken down by ordinary chemical means?
a. Element
b. Molecule
c. Compound
d. Bond
3. An ion is formed when an atom gains or loses:
a. Protons
b. Neutrons
c. Bonds
d. Electrons
4. Atoms connected by covalent bonds share:
a. Pairs of electrons
b. Ionic compounds
c. Carbon and oxygen
d. Hydrogen ions
5. Chemical reactions change substances into different substances by:
a. Conserving matter between the substances
b. Breaking and forming chemical bonds
c. Strengthening electrical charges of substances
d. Changing a solute into a solvent
