Gen. Chem.- Chap. 1
Choose the correct answer for each question.
 

1Which of the following statements applies to a mixture?
Cannot be broken down into simpler substances.
May be separated by physical means.
Contain 2 or more elements in fixed mass percents.
Have different properties from the substances from which they were made.

2Which is the shortest length?
2 cm
0.002 km
200 mm
1m

3Convert 673 K to degrees Celsius.
400 C
946 C
27 C
252 C

4The number of significant figures in the number 0.0001 is...
1
2
4
5

5The mathematical operation (625)(0.020) L yields...
10 L
13 L
12.5 L
12.50 L

6The mathematical operation 80.127g - (16.2 x 3.100) g yields...
30 g
29.9 g
29.93 g
29.927 g

7Convert, using the factor label system, 400 mg to kg.
0.0004 kg
4 x 10 8 kg
0.4 kg
40 kg

8Convert, using the factor label system, 20.0 lbs. to grams. (1 kg = 2.2 lbs.)
9090 g
44,000 g
22.7 g
22,700 g

9Calculate the mass of 100 mL of methanol if the density of methanol = 0.80 g/mL.
75 g
800 g
1.25 g
80 g

10Which of the following is NOT a physical property?
boiling pt.
color
flammability
hardness