Practice Test 1
Supplemental Instruction
Iowa State University
Leader:
Course:
Instructor:
Date:
Sara
Chem 177
Kingston
1. What is the correct formula for iron (III) Phosphate?
a. Fe2(PO4)3
b. Fe3(PO4)3
c. FePO4
d. Fe3(PO4)2
2. hydrofluoric acid is a clear liquid that had a density of 5.3 g/mL. At room temperature it reacts
with silicon dioxide which has a melting point of 1600 degrees Celsius. In the reaction liquid
water and silicon tetrafluoride (with a boiling point of -86 degree Celsius) is produced.
a. Write a balanced chemical equation for this reaction and be sure to include states.
4 HF (l) + SiO2 (s)  2 H2O (l) + SiF4 (g)
b. List 1 chemical, 1 intensive, and 1 physical property from the above description.
Chemical: HF reacts with SiO2
Physical: melting point and boiling point:
Intensive: density
c. If 3.23 grams hydrofluoric acid with excess Silicon dioxide undergo the reaction from
above. How many molecules of Silicon tetrafluoride are produced.
3.23𝑔𝐻𝐹 ∗ (
𝑚𝑜𝑙𝑠 𝐻𝐹
1𝑚𝑜𝑙𝑆𝐼𝐹4 6.022 ∗ 1023 𝑚𝑜𝑙𝑒𝑐𝑢𝑙𝑒𝑠
)(
)(
) = 2.43 ∗ 10^22
20.01𝑔 𝐻𝐹 4𝑚𝑜𝑙𝐻𝐹
𝑚𝑜𝑙
3. In the combustion of C2H4 what coefficient would be placed in front of H2O ?
C2H2 +5/2O22CO2+H2O
a. 1
b. 1/2
c. 3
d. 5/2
e. 5
4. Solve the equation with the correct amount of significant figures: (10.5734 x 11.527) + 1.3
a. 100
b. 120
c. 123.179
d. 123.18
e. 123.2
5. What is the mass of a single molecule of calcium carbonate?
a. 102 Amu
b. 102 g
c. 162 Amu
d. 162 g
6. Air is composed mostly of Nitrogen and Oxygen. Nitrogen in its elemental form is diatomic
(N2). N2 is a __________
a. Pure substance
b. Homogeneous mixture
c. Heterogeneous mixture
d. Compound
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7. What is the charge of a proton, neutron and electron respectively?
a. +,-,0
b. -,+,0
c. 0,+,d. 0,-,+
e. +,0,Use the periodic Table to answer the next 3 questions:
8. What letter element is a noble gas?
F
9. What letter element is an alkali metal?
A
10. What letter element could have multiple charges
C
11. The density of a wood block is0.67g/mL. The block is 5.4 in * 3.3 in * 6.1 in. How much will
the block weigh in kg?
5.4 𝑖𝑛 ∗ 3.3𝑖𝑛 ∗ 6.1𝑖𝑛 ∗ (
2.53𝑐𝑚 3
𝑔
1𝑚𝐿
1𝑘𝑔
) (0.67
)(
)(
) = 1.2 𝑘𝑔
3
1𝑖𝑛
𝑚𝐿 1𝑐𝑚
1000𝑔
12. What would be the best choice for the volume of the graduated cylinder?
a. 3
b. 3.0
c. 3.5
d. 3.75
e. 4.0
13. If you have 24 g of Al2O3, how many atoms of Aluminum do you have?
24 g Al2O3 | 1 mol Al2O3 | 2 mol Al | 6.022 * 1023 molecules = 2.8 * 1023 molecules
| 102 g Al2O3 | 1 mol Al2O3 |
mol
14. Fill in the blanks in the table:
Compound name
Compound formula
Iron(II) Chloride
Sulfur Tetrabromide
Chlorate ion
Sodium Nitrate
Hypoiodous acid
trinitrogen Monochloride
FeCl2
SBr4
ClO3NaNO3
HIO
N3Cl
Ionic, covalent, ion, organic or
acid?
Ionic
Covalent
ion
Ionic
Acid
Covalent
Butane
C4H10
Organic