Unit 1: #1-7

Question 1

1a. Solve the following equation. How many significant figures are used? 21.3g/1.3cm^3

Answer 1

16g/cm^3, 2 sig figs

Question 2

1b. Solve the following equation. How many significant figures are used? 6.34cm^2 times 1.2cm all divided by 1.217cm

Answer 2

6.3cm^2, 2 sig figs

Question 3

1c. Solve the following equation. How many significant figures are used? 13.21m times 61.5m

Answer 3

812m^2, 3 sig figs

Question 4

1d. Solve the following equation. How many significant figures are used? 21.50cm/8.50in

Answer 4

2.53cm/in, 3 sig figs

Question 5

1e. Solve the following equation. How many significant figures are used? 0.82g + 13.1g

Answer 5

13.9g, 3 sig figs

Question 6

2. What is mass?

Answer 6

Number of particles

Question 7

2. What is volume?

Answer 7

Space occupied by particles (total)

Question 8

2. What is density?

Answer 8

Spacing between particles and number of g per unit volume

Question 9

2. What is specific heat capacity?

Answer 9

Energy required to raise 1g of a substance by 1 degree Celsius

Question 10

2. What is boiling point?

Answer 10

Temperature at which liquid turns to gas

Question 11

2. What is melting point?

Answer 11

Temperature at which solid turns to liquid

Question 12

2b. Which of the following would NOT change in a closed system? Which COULD change in an enclosed system? (mass, volume, density, specific heat capacity, melting point, boiling point)

Answer 12

Not change: mass, specific heat capacity, melting point, boiling point.
Change: volume, density

Question 13

4a. Complete the following conversion. Consider sig figs. 37g -> mg

Answer 13

37g x 1000mg/1g = 37,000mg

Question 14

4b. Complete the following conversion. Consider sig figs. 4.7kg -> g

Answer 14

4.7kg x 1000g/1kg = 4,700g

Question 15

4c. Complete the following conversion. Consider sig figs. 138m -> km

Answer 15

138m x 1km/1000m = 0.138km

Question 16

4d. Complete the following conversion. Consider sig figs. 4021mm -> km

Answer 16

4021mm x 1m/1000mm x 1km/1000 m = 0.004021km

Question 17

5a. Convert standard notation to scientific notation and vice versa. 1300

Answer 17

1.3 x 10^3

Question 18

5b. Convert standard notation to scientific notation and vice versa. 0.00155

Answer 18

1.55 x 10^-3

Question 19

5c. Convert standard notation to scientific notation and vice versa. 1,680,000

Answer 19

1.68 x 10^6

Question 20

5d. Convert standard notation to scientific notation and vice versa. 0.0273

Answer 20

2.73 x 10^-2

Question 21

6a. Use the following table. Determine the density of the substance. Volume: 1.5, 3, 4.5, 6, 7.5, 9. Mass: 11.7, 24, 35.1, 48, 58.5, 70

Answer 21

70-11.7/9-1.5 = 58.3/6 = 9.7g/cm^3

Question 22

6b. Write the scientific line equation for this substance. Density=9.7, x=9, y=70

Answer 22

Y=(9.7)x+b, 70=(9.7)(9)+b, b=0.8.

Final answer: y=9.7x+0.8

Question 23

6c. What volume would 150g of the substance occupy? Consider sig figs. Use the following equation: y=9.7x+0.8

Answer 23

150=9.7x+0.8, Volume=15.38g

Sig fig: 15g

Question 24

7a. Will a substance with a density of 9.7 float or sink. Explain.

Answer 24

Sink; its more dense than water (1)

Question 25

7b. Compare a substance (density=9.7) to water on a particle level.

Answer 25

The substance has more particles packed into the same amount of space compared to water.