1411 - Chapter 2 – Atoms, Molecules, and Ions
1. Determine the number of protons, electrons, and neutrons in the followings:
a)
65
Zn
b) cobalt-60
c) sodium
d) 52 Cr3+
e)
130 I-
2. For each of the following elements, write its chemical symbol or name, and indicate the type
and group to which it belongs:
a) potassium
b) arsenic
c) iodine
d) iron
e) Ca
3. Determine the empirical formulas for the following compounds:
a) C6H10O2
b) Si3O9
c) N2O4
e) CH4
f) S4N4
4. Predict the charges of the ions of the followings:
a) Al
b) OH
c) O
d) SO4 e) HSO3
f) ClO
5. Predict the empirical formula for the ionic compounds formed by followings:
a) Ca2+ , PO43-
b) K+ , NO3-
c) Al3+ , OH-
d) Ba2+ , HCO3-
6. Predict whether each of the following compound is molecular or ionic:
a) NaClO
b) NOCl
c) CoCO3
d) SCl2
7. Give names or chemical formulas for the following acids:
a) H2S
b) Nitric acid
c) Perbromic acid
d) HI
e) AlN
e) H2SO3
f) Acetic acid
g) HCN
8. Provide names or chemical formulas for the followings:
a) Cr(NO3)3
b) silver nitrate
c) Cr2O3
e) Lead(IV) acetate f) dinitrogen trioxide g) S4N4
d) Fe(NO2)2
h) KClO3
9. Give a chemical formula or name for the followings:
a) chlorate ion
b) oxide ion
c) barium ion
e) HSO3-
f) S2-
g) Fe3+
d) hydrogencarbonate ion
h) H3O+
10. Naturally occurring magnesium has the following isotopic abundances:
Isotope
Mg-24
Mg-25
Mg-26
Abundance
78.70%
10.13%
11.17%
Mass
23.98504
24.98584
25.98259
Calculate the average atomic mass of magnesium.
11. What is the difference between hydroacid and oxyacid? Give two examples of each.
12. What is the name of the following acids?
a) HClO
b) HClO2
c) HClO3
d) HClO4