Question 1

Which of the following is a derived SI unit?

Accepted Answer

Liter ($$L)$$

Question 2

How many significant figures are in the number $$0.1230 	imes 10^3$?

Accepted Answer

4

Question 3

A measurement is recorded as $$32.2 kg. If $$you multiply this by $$6 (an $$exact number), how many significant figures should your answer have?

Accepted Answer

3

Question 4

Which metric prefix corresponds to $$10^{-6}$$?

Accepted Answer

Micro

Question 5

A gallon is exactly $$3.785$$ liters. How many significant figures does this value have?

Accepted Answer

Infinite

Question 6

Which of the following numbers has 3 significant figures?

Accepted Answer

$$1.23 	imes 10^2$

Question 7

When subtracting $$73 cm $$and $$22.5 cm$$, how many decimal places should the answer have?

Accepted Answer

1

Question 8

Convert $$1.8403 	imes 10^3$ km to miles using 1$ mile = 1.609$ km. Report your answer with the correct number of significant figures.

Accepted Answer

$$1.144 	imes 10^3$ miles

Question 9

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

Accepted Answer

Zeros at the end of a number are significant if the number contains a decimal point.

Question 10

Which SI base unit is used to measure the amount of substance?

Accepted Answer

Mole ($$mol)$$

Question 11

A scientist measures a sample as $$1200 g. $$How many significant figures does this measurement have?

Accepted Answer

2

Question 12

Which of the following is the correct scientific notation for $$0.000123$$?

Accepted Answer

$$1.23 	imes 10$$^{-4}$$

Question 13

If you add $$12.30$$ and $$1.2$$, what is the correct answer with proper significant figures?

Accepted Answer

$$13.5$$

Question 14

Which metric prefix represents $$10^{12}$$?

Accepted Answer

Tera

Question 15

A measurement is reported as $$1.200 	imes 10^3$ m. How many significant figures does this value have?

Accepted Answer

4

Question 16

Which of the following is NOT a base SI unit?

Accepted Answer

Liter ($$L)$$

Question 17

A student measures the mass of a sample as $$0.00560 g. $$How many significant figures does this measurement have?

Accepted Answer

3

Question 18

Which of the following conversions is correct for $$1$$ nanowatt ($$nW$$)?

Accepted Answer

$$1 	imes 10$$^{-9}$$ W

Question 19

Why is the number of significant figures in an exact conversion (e.g., $$1$$ gallon $$= 3.785$$ liters) considered infinite?

Accepted Answer

Because the conversion is defined and has no measurement error.

Question 20

A measurement is recorded as $$1203 g. $$How many significant figures does this value have?

Accepted Answer

4

Measurement, Units, and Significant Figures in Chemistry

Study Guide - Practice Questions