GREAT CONCEPT SHEET!
1. Classify the following as physical or chemical changes.
a. burning paper
b. bending wire
c. cutting grass
2. A solution is: a. a mixture b. a compound
3. A pure substance: a. homogeneous
d. souring milk
c. a element
b. compounds
d. heterogeneous
c. mixture d. heterogeneous e. a and b
4. A pure substance: a. solution
b. mixture c. elements
d. heterogeneous
5. Unevenly mixed: a. solution
b. compounds c. elements
d. heterogeneous
6. Two samples of copper have a mass 20 and 100 grams respectively. You could assume that their ______ is
equal: a. mass b. volume c. weight d. density
7. The slowest moving molecules are found in: a. solids
b. gases
8. A phase of matter with no definite shape and volume is: a. solid
c. liquids
b. gas c. liquid
9. A change which does not produce a new substance with a new identity is:
a. physical b. chemical c. ordinary d. homogeneous
10. Classify the following as physical or chemical properties.
a. red
b. reacts with water c. weighs 20 kg
d. flammable
11. A change which produces a change in form, with a change in composition is:
a. physical b. chemical c. ordinary d. homogeneous
12. Burning gasoline is a _____change. a. physical b. chemical
13. Melting ice is a ______change. a. physical b. chemical
c. ordinary d. homogeneous
c. ordinary d. homogeneous
14. When elements form a compound their properties: a. remain the same
b. change
15. Mixtures can be separated by ______ means: a. physical b. chemical c. natural d. simple
16. Salad dressing which you have to shake is: a. heterogeneous b. homogeneous c. an element
17. Which of the following is a physical property? a. corrosive
b. flammable
18. Which of the following is not a pure substance? a. sugar
b. dirt
19. Which of the following is a homogeneous mixture?
20. Convert to scientific notation:
a. 67,001
b. 54.65
c. 0.00453
c. density
c. salt
d. gold
a. salt b. salt water c. dirt d. sulfur
d. 123.4
e. 0.0992
f. 4,009,001
g. 0.0078500
Determine the number of significant figures in each of the following numbers. Then, indicate what two
numbers it falls between on the measuring device being used!
(a) 24.5 grams
(b) 540 liters
(c) 0.52 centimeters
(d) 98.4 kg
(e) 15,000 milligrams
(f) 566.0 mm
(g) 3,400 meters
(h) 2,000 Mg
(i) 2452 nanoliters
(j) 23.58 km
(k) 70 grams
(l) 44 ml
(m) 15,000 liters
(n) 190.05 ml
(o) 5.7 grams
(p) 443 mL
(q) 100.1 g
(r) 640,002 m
(r) 473 ml
(s) 20.020 g
(t) 0.002 meter
(u) 1,000,000 liters
(v) 4,200 km
(w) 0.0020 g
(x) 0.10 liter
(y) 1.0004230 g
(z) 104.20 g
Perform these calculations rounding off to the correct number of significant digits AND units (if applicable)!
_______
1.
8.54 + 143.1
_______
2.
(0.940 x 9700) x 8243
_______
3.
500 (112.5 - 8.783)
_______
4.
54 x 407
_______
5.
0.00035 x 44.9
6. 10 g /0.20 cm3=
7. 0.3658 g +5.3 g =
8. 23.45 g + 0.2300 g + 12000g + 0.00345 g =
9. 34.7 mL - 2088 mL - 456.003 mL - 130,000 mL =
10. 45.667 m x 23.3m x 12.00m x 2000m =
11. (0.00093 g/0.3800g) / (140.0g / 0.000004g) =
12. (13.22 cm x 20.0 cm) / (34500 cm x 0.000013 cm) =
13. (13.66 L2 + 22.4 L2)/(23000L x .00462L) =
14. (14.6 g - 16.996g) + (7.0023 g x 230,000) =
15. (13.667 mL2 + 20.0 mL2 + 3400 mL2) / 4.0mL =
16. (20300 m x 14.67 m x 0.0003 m) / 10000 m =
17. (23.004 mm x 103 mm x 400 mm) - (16.4 mm3) =