Question

1. Which of the following is true about an atom?
a. It consists of protons, neutrons, and electrons.
b. It has a nucleus consisting of protons, neutrons and electrons.
c. The protons are equal in number to the electrons, so the nucleus is neutral.
d. All are true e. None are true

2. The proper symbol for the magnesium cation is
a. Mg2+
b. Mg
c. Mg2-
d. Mg2 2+
e. Mg°

3. The bonds in the ammonia molecule make angles of roughly
a. 90 degrees
b. 105 degrees
c. 125 degrees
d. 180 degrees
e. 60 degrees

4. A catalyst works by
a. making a reaction exothermic.
b. increasing the frequency of collisions between reactant particles.
c. shifting the equilibrium.
d. lowering the energy of activation.
e. making a reaction endothermic

5. Identify the least electronegative atom.
a. P
b. Na
c. I
d. B
e. O

6. Give the number of nonbonding pairs of electrons in H2NOH.
a. 0
b. 1
c. 2
d. 3
e. 4

7. Ionic bonds form between
a. only elements in the same row of the periodic table
b. only elements in the same column of the periodic table
c. elements with significant differences in electronegativity
d. elements with similar electronegativity
e. two identical atoms

Answer 1