$$1\ \mathrm{m}^3 = 1 \times 10^6$\ \mathrm{cm}^3$$

$$\frac{1\ \mathrm{kg}}{1000\ \mathrm{g}} \times \frac{1\ \mathrm{mL}}{0.792\ \mathrm{g}}$$

Question 1

Which of the following numbers contains three significant figures?

Accepted Answer

0.0200

Question 2

A student measures the mass of a sample as 0.792 g and its volume as 1.00 mL. What is the density of the sample in $$\mathrm{g/mL}$$?

Accepted Answer

$$0.792\ \mathrm{g/mL}$$

Question 3

Which of the following is the correct conversion from $$25\ ^\circ\mathrm{C} to $$Kelvin?

Accepted Answer

$$298\ \mathrm{K}$$

Question 4

Which prefix represents a multiplier of $$10^{-6}$$?

Accepted Answer

micro

Question 5

A measurement is recorded as $$0.035\ \mathrm{kg}. $$How many significant figures does this value have?

Accepted Answer

3

Question 6

Which of the following best describes the term 'accuracy' in scientific measurement?

Accepted Answer

How close a measured value is to the true value

Question 7

A student needs to convert $$657\ \mathrm{cm}^3 to$$ $$\mathrm{m}^3. $$Which conversion factor should be used?

Accepted Answer

$$1\ \mathrm{m}^3 = 1 	imes 10^6$\ \mathrm{cm}^3$$

Question 8

If a value is reported as $$0.00450$$, how many significant figures does it have?

Accepted Answer

3

Question 9

Which of the following is the correct formula for density?

Accepted Answer

$$\rho = \frac{m}{V}$$

Question 10

A student calculates the sum $$12.34 + 1.3 + 0.604. $$How many significant figures should the answer have?

Accepted Answer

2

Question 11

Which of the following statements about precision is correct?

Accepted Answer

Precision refers to how close repeated measurements are to each other.

Question 12

A sample has a mass of $$35.0\ \mathrm{g}$$ and a volume of $$44.0\ \mathrm{mL}. $$What is its density in $$\mathrm{g/mL}$$?

Accepted Answer

$$0.795\ \mathrm{g/mL}$$

Question 13

Which of the following is NOT a standard SI unit?

Accepted Answer

liter (L)

Question 14

When multiplying or dividing measurements, the answer should be reported with:

Accepted Answer

The same number of significant figures as the measurement with the fewest significant figures

Question 15

Which conversion factor would you use to convert $$0.035\ \mathrm{kg} of $$methanol to mL, given the density is $$0.792\ \mathrm{g/mL}$$?

Accepted Answer

$$\frac{1\ \mathrm{kg}}{1000\ \mathrm{g}} 	imes \frac{1\ \mathrm{mL}}{0.792\ \mathrm{g}}$$

Question 16

Which of the following numbers is expressed in scientific notation with the correct number of significant figures for the value $$0.0150$$?

Accepted Answer

$$1.50 	imes 10$$^{-2}$$

Question 17

Which of the following is the correct definition of a conversion factor?

Accepted Answer

A ratio that expresses how many of one unit are equal to another unit

Question 18

A temperature change of $$10\ \mathrm{K} is $$equivalent to what change in $$^\circ\mathrm{C}$$?

Accepted Answer

$$10\ ^\circ\mathrm{C}$$

Question 19

Which of the following statements about zeros in significant figures is correct?

Accepted Answer

Zeros to the right of a nonzero digit in a measurement are significant if there is a decimal point.

Chapter E: Essentials—Units, Measurement, and Problem Solving (General Chemistry Study Notes)

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