Name:__________________________________
Lab:
W
Chem2A Exam 1
Friday March 17th 2017
Pg1 _________
Pg2 _________
Pg3 _________
Pg4 _________
Pg5 _________
Pg6 _________
Pg7__________
Pg8__________
Total ________/100
F
1. Classify each process as a chemical or physical change:
a. Dissolving calcium chloride in water _____________
b. Burning gasoline to power a car
_____________
c. Heating wax so that it melts
_____________
2. Which quantity in each pair is larger?
a. 5mL or 5dL
b. 10mg or 10µg
c. 5cm or 5mm
d. 10Ms or 10ms
3. How many significant digits does each number contain?
a. 16.00
____
b. 160
____
c. 0.00160
____
d. 1,600,000
____
e. 1.060 x 1010
____
4. Carry out each calculation and report the answer using the proper number
of significant digits.
a. 53.6 x 0.41
=
______________
b. 25.825 – 3.86
=
______________
c. 65.2 / 12
=
______________
d. 41.0 + 9.135
=
______________
e. 694.2 x 0.2
=
______________
5. Write each quantity in scientific notation
a. 1,234 g
_________________
b. 0.000 016 2 m
_________________
c. 5,244,000 L
_________________
d. 0.00562 g
_________________
6. Convert each number to its standard form
a. 3.4 x 10
_________________
b. 5.822 x 10-5
_________________
c. 3 x 102
_________________
d. 6.86 x 10-8
_________________
7. Carry out each of the following conversion
a. 300g to mg
_________________
b. 2L to µL
_________________
c. 5.0cm to m
_________________
d. 300g to kg
_________________
e. 25oC to K
_________________
8. If milk has a density of 1.03 g/mL, what is the mass of 5L reported in g?
_________________
9. Name the following atoms
a. Ag _______________________________
b. Au _______________________________
c. B _______________________________
d. Kr _______________________________
e. He _______________________________
10. Identify the following elements as an alkali metal, alkaline earth metal,
transition metal, inner transition metal, metalloid, nonmetal, halogen, or
noble gas:
a. Sodium
_________________
b. Silver
_________________
c. Xenon
_________________
d. Platinum
_________________
e. Uranium
_________________
f. Tellurium (Te)
_________________
11. Fill in the table:
Elemental
Symbol
C
Atomic
Number
Mass
Number
Number Number of Number of
of Protons Neutrons
Electrons
12
31
15
35
Mg
24
30
12. Calculate the atomic weight of silver, which has two isotopes with the
following properties: silver-107 (106.91 amu, 51.84% natural occurrence)
and silver-109 (108.90 amu, 48.16% natural occurrence)
________________________
13. Fill in the table:
# of
Electrons
1s22s22p63s23p64s23d104p65s2
1s22s22p63s23p4
1s22s22p63s1
[Ne]3s23p5
14. Write an electron-dot symbol for each element:
a. Beryllium
b. Silicon
c. Iodine
d. Magnesium
e. Argon
# of Valence Element
electrons Identity
15.Which atom in the following pairs is larger?
a. B
or
C
b. Ca
or
Mg
c. Si
or
S
d. Kr
or
Ne
e. S
or
O
16. What type of bond would the following atoms make with each other?
a. Potassium and Oxygen
____________________
b. Sulfur and Carbon
____________________
c. Two Bromine atoms
____________________
d. Carbon and Oxygen
____________________
17. Give the ion symbol for each ion:
a. Sodium Ion
______
b. Selenide
______
c. Manganese Ion
______
d. Gold (III)
______
e. Iron (III)
______
18.How many protons and electrons are present in each ion?
a. K+
__________protons
__________electrons
b. S-2
__________protons
__________ electrons
c. Mn2+
__________protons
__________ electrons
d. Fe2+
__________protons
__________ electrons
e. Cs+
__________protons
__________ electrons
19. Give the formula for each polyatomic ion:
a. Sulfate
____________
b. Ammonium
____________
c. Hydrogen Carbonate
____________
d. Cyanide
____________
e. Sulfite
____________
20. Complete the following table by filling in the formula of the ionic
compound derived from the cations on the left and each of the anions
across the top:
I-
CN-
NO3-
K+
Mg2+
Cr3+
Na+
21. Name each ionic compound:
a. Na2O ________________________
b. BaS
________________________
c. PbS2 ________________________
d. AgCl ________________________
e. CoBr2 ________________________
SO42-
HPO42-
22.Write a formula from each name:
a. Magnesium carbonate
________________________
b. Nickel sulfate
________________________
c. Copper (II) hydroxide
________________________
d. Gold (III) nitrate
________________________
e. Lithium phosphate
________________________
23. Name each ionic compound:
a. NH4Cl
________________________
b. PbSO4
________________________
c. Cu(NO3)2
________________________
d. Ca(HCO3)2
________________________
e. Fe(NO3)2
________________________
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