Which of the following is NOT one of the major elements present in the human body:
A. Oxygen C. Iron
B. Carbon D. Hydrogen
C. Iron
Which of the following NOT a subatomic particle:
A. Proton C. Isotope
B. Electron D. Neutron
C. Isotope
The total number of electrons in an atom equals the number of:
A. Neutrons in its nucleus C. Protons in its nucleus
B. Electrons in its nucleus D. Ions in its nucleus
C. Protons in its nucleus
An atom can be described a chemically inert if its outermost electron shell contains:
A. Three electrons C. Six electrons
B. Five electrons D. Eight electrons
D. Eight electrons
Isotopes are atoms of elements that differ in their number of:
A. Protons C. Neutrons
B. Electrons D. Nuclei
C. Neutrons
Ionic bonds are chemical bonds formed by the:
B. Transfer of electrons from one atom to another
Chemical bonds formed by the sharing of electrons are called:
A. Ionic C. Hydrogen
B. Covalent D. Electronic
B. Covalent
A chemical reaction in which substances combine to form more complex substances is called:
A. Synthesis C. Exchange
B. Decomposition D. Reversible
A. Synthesis
True or False
Matter is a term used by chemists to describe all the materials or substances around
us.
True
True or False
Atomic weight refers to the number of protons plus the number of neutrons in an
atom.
True
True or False
Sodium chloride is an example of a covalent bond
False
True or False
Hydrogen bonds form from an equal charge distribution within a molecule
False
True or False
The digestion of food is an example of a decomposition reaction