Question 1

Which of the following statements about significant figures is CORRECT?

Accepted Answer

All non-zero digits are significant.

Question 2

A measurement is recorded as $$0.1230 	imes 10^3$. How many significant figures does this number have?

Accepted Answer

4

Question 3

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

Accepted Answer

Mole (mol)

Question 4

A greyhound named Mo weighs $$32.2 kg. $$What is the total weight of 6 Mo's, reported with the correct number of significant figures?

Accepted Answer

$$193 kg$$

Question 5

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

Accepted Answer

Micro

Question 6

A measurement is given as $$1200 m. $$How many significant figures does this number have?

Accepted Answer

2

Question 7

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

$$1.14 	imes 10^3$ miles

Question 8

Which of the following is an example of an exact number?

Accepted Answer

The number of liters in a gallon (by definition).

Question 9

When multiplying $$12.30 by$$ $$0.123$$, how many significant figures should the answer have?

Accepted Answer

3

Question 10

Which of the following is the correct scientific notation for $$0.0000456$$?

Accepted Answer

$$4.56 	imes 10$$^{-5}$$

Question 11

A soccer ball is placed on top of Mo's head, whose height is $$73 cm. $$The ball adds $$22.5 cm. $$What is the total height, and how many decimal places should the answer have?

Accepted Answer

$$95.5 cm$$, 1 decimal place

Question 12

Which of the following is NOT a derived SI unit?

Accepted Answer

Meter (m)

Question 13

Which rule applies when determining significant figures in the result of an addition or subtraction?

Accepted Answer

The answer should have the same number of decimal places as the measurement with the fewest decimal places.

Question 14

Which of the following numbers has 5 significant figures?

Accepted Answer

$$1.2000 	imes 10^3$

Question 15

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

Accepted Answer

Tera

Question 16

Why are zeros at the beginning of a number not considered significant?

Accepted Answer

They only show the position of the decimal point.

Question 17

Which of the following conversions is correct for $$1$$ gallon to liters?

Accepted Answer

$$1$$ gallon $$= 3.785$$ liters

Question 18

A measurement is recorded as $$1.23 	imes 10^2$. Which digits are significant?

Accepted Answer

1, 2, and 3

Question 19

Which of the following is the correct abbreviation for the SI unit of luminous intensity?

Accepted Answer

cd

Question 20

If a measurement is given as $$0.00120 m$$, how many significant figures does it have?

Accepted Answer

3

Measurement, SI Units, Significant Figures, and Scientific Notation in Chemistry

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