A substance containing atoms of different elements that are bonded together is called a(n)
(a) Molecule
(b) Compound
(c) Mixture
(d) Isotope
(e) Solution
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A substance containing atoms of different elements that are bonded together is called a(n)
(a) Molecule
(b) Compound
(c) Mixture
(d) Isotope
(e) Solution
All organic compounds in the human body contain all of the following elements except
(a) Hydrogen
(b) Oxygen
(c) Carbon
(d) Calcium
(e) Both a and d
The speed, or rate, of a chemical reaction is influenced by
(a) The presence of catalysts
(b) The temperature
(c) The concentration of the reactants
(d) a, b, and c are all correct
Which of the following chemical equations illustrates a typical decomposition reaction?
a. A + B → AB
b. AB + CD → AD + CB
c. 2A₂+ B₂ → 2A₂B
d. AB → A + B
The number and arrangement of electrons in an atom's outer energy level (valence shell) determine the atom's
(a) Atomic weight
(b) Atomic number
(c) Molecular weight
(d) Chemical properties
A pH of 7.8 in the human body typifies a condition referred to as
(a) Acidosis
(b) Alkalosis
(c) Dehydration
(d) Homeostasis