Unit 1: #1-5

Question 1

1a. What is the uncertainty of the graduated cylinder shown?

Answer 1

+0.1mL, -0.1mL

Question 2

1b. How should the measurement be recorded?

Answer 2

21.5mL

Question 3

1c. A beaker can also be used to measure liquid volumes. (True or false)

Answer 3

False

Question 4

2a. Identify the number of sig figs in the following measurement. Convert to scientific notation. 0.0048L

Answer 4

2 sig figs, 4.8x10^-3

Question 5

2b. Identify the number of sig figs in the following measurement. Convert to scientific notation. 1207cm

Answer 5

4 sig figs, 1.207x10^3

Question 6

2c. Identify the number of sig figs in the following measurement. Convert to scientific notation. 3.80g/cm^3

Answer 6

3 sig figs, 3.80x10^0

Question 7

2d. Identify the number of sig figs in the following measurement. Convert to scientific notation. 1400mL

Answer 7

2 sig figs, 1.4x10^3

Question 8

2e. Identify the number of sig figs in the following measurement. Convert to scientific notation. 0.090g

Answer 8

2 sig figs, 9.0x10^-2

Question 9

4a. Solve. Consider sig figs. 21.3g/1.30cm^3

Answer 9

16.4g/cm^3

Question 10

4b. Solve. Consider sig figs. (6.34cm^2 times 1.2cm)/1.217cm

Answer 10

6.3cm^2

Question 11

4c. Solve. Consider sig figs. 13.21m times 61.5m

Answer 11

812m^2

Question 12

4d. Solve. Consider sig figs. 13.1g minus 0.82g

Answer 12

12.3g

Question 13

5a. Write the scientific line equation for the line of best fit. 2.1x-0.0129

Answer 13

molesCl = (2.1molCl/molZn) molesZn-0.0129molCl

Question 14

5b. What does the slope 2.1x tell us about the physical meaning?

Answer 14

There are 2.1 moles of Cl per every 1 mole of Zinc.

Question 15

5c. What is a systemic error that may have affected the data? Random error?

Answer 15

Systemic: incomplete process of driving off excess water
Random: measurement uncertainty (+0.01g, -0.01g)