Quiz Chapter 3

Question 1

Compare and contrast accuracy and precision.

Answer 1

Accuracy measures how close a measurement is to the actual value of what is measured, and precision is also a measure, but of how close a series of measurements are to one another, irrespective of the actual value.

Question 2

A student measured the mass of a sugar cube to be 4.2 g. The accepted value of the mass was 4.0 g. Calculate the error and the percent error of the student’s measurement.

Answer 2

Error: 0.2 g

Percent error: 5
1 sig fig.

Question 3

45.6x10^7 is an example of a number written in scientific notation. T/F

Answer 3

False; True scientific notation only has one digit before the decimal place. 4.56 x 10^8

Question 4

Write the following number in scientific notation (Use the form 10^n to represent 10n)

34,2345.67

Answer 4

3.4234567 x 10^5

Question 5

Write the following number in scientific notation. (Use the form 10^n to represent 10n).

0.0056

Answer 5

5.6x10^-3

Question 6

write each number in standard notation.

a. 1.72x10^7

b. 3.56x10-4

Answer 6

17,200,000
0.000356

Question 7

How many significant figures are in the measurement 45.0980 m?

Answer 7

6

Question 8

How many significant figures are in the measurement 0.00456 cm?

Answer 8

3

Question 9

Give the answer for each calculation with the correct number of significant figures.

34.5 x 0.75 =

34.5 - 0.75 =

Answer 9

26, 33.8

Question 10

Complete the following conversions:

0.25m = cm

9.8g = kg

35ms = s

4.2dL = L

Answer 10

25cm

0.0098kg

0.035s

0.42L

Question 11

54.2 oC

Answer 11

327.2K

Question 12

Which shows the conversion factor that you would use to convert tablespoons to milliliters.

Answer 12

15 mL/ 1 tablespoon

Question 13

A normal concentration of glucose, or sugar, in the blood is 95 mg/dL. How many grams of sugar would be present per liter of blood?

Answer 13

0.95 g/L

Question 14

The density of zinc is 7.14 g/cm3. What is the volume of a 5.00 g piece of zinc?

Answer 14

0.700 cm^3