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# Download 1411 Chapter 1 Practice Problems

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```CHEM - 1411 - CHAPTER 1
CHEMICAL FOUNDATIONS
Q1. Classify the following in to pure substances and mixtures.
Steel,
Air,
Smoke,
mercury,
Silver foil,
Brass,
Bronze,
Iodized table salt,
Dry Ice,
Table Salt,
Diamond,
Graphite
Q2. How would you separate the following?
Mixture of Sand, Salt and Ammonium Chloride
Mixture of Iron filings and Sand
Mixture of water and alcohol
Mixture of Sugar and Water
Q3: Convert the following
5milliseconds to sec,
10 cm to pm,
0.05 m to cm,
0.02 m to mm,
0.005 L to mL,
0.045kg/L to mg/ml
Q4: Find the number of significant figures in the following
0.0945,
83.22,
0.000550,
453.39 g,
25.9000 g,
105 km,
20 L,
2001 kg,
0.30050,
100 m.
Q5. Express the following numbers in three significant figures.
2.0451,
45.136,
567.9,
11.842,
9.117
21.2m,
Q6: Change into scientific notation:
38548 kg,
3847 g,
0.00839,
0.0000568,
87000 yrs,
0.097 sec.
Q7. Perform the following calculations.
1. 4.18 x 10-2 + 2.86 x 10-3
2. 5.693 x 10-4 – 3.21 x 10-5
2. Multiply 4.6 x 103 by 2.6 x 10-2
3. Divide 3.45 x 104 by 7.2 x 10-2
Q8. Perform the following calculations to the correct number of significant figures.
a) 35.52+10.3
b) 3.56-0.021
Q9. Perform the following calculations to the correct number of significant figures.
a) 6.26 x 5.8
b) 5.27/12
Q10: Make the following conversions using the correct significant figures.
4.18 gal to mL,
250 lb to kg,
2.95 ounces to mg,
Q11. How many kg, g, and mg are there in 0.60lb calculated to the correct number
of significant figures?
Q12. Express the following.
a. 452ml in liter
b.2.89lits in ml
c. 3.8 gallon in ml.
Q13. a.What is the volume of 250.0 g of acetone whose density is 0.7899 g/cm3
b. Calculate the density of a liquid whose 60ml weighs 0.0459 kg.
Q14: Calculate the mass of 135.0ml of a liquid that has density of 0.8758g/ml at 00C
Q15: Convert the following:
a. 680F to 0C
,
b. 450F to 0C
f. –400F to 0C,
e. 2730C to K
,
c. 1250C to 0F ,
d. 270C to K ,
g. 300 K to 0C,
h. 216 F to K
Some conversions
109
106
103
102
10
10-1 (0.1)
10-2
10-3
10-6
10-9
10-12
1 Giga
1 Mega
1 Kilo
1 Hecto
1 Deka
1 Deci
1 centi
1 Milli
1 Micro
1 Nano
1 Pico
(1meter = 10 Decimeter)
(1meter = 100 Centimeter)
(1meter = 1000millimeter)
(1meter = 1000000micrometer)
(1meter = 109nanometer)
(1meter = 1012picometer)
1 in = 2.54 cm, 1 cu.ft = 28.32 L, 1 lb = 453.59 gm
39.37 in = 1m, 1.057 qt = 1L, 1 ounce = 28.35 g, 1 mile= 1.609 km, 1 gallon = 3.7853 L, 1 dram =
1.772 g.
```
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