Q: Which of the following is an exact number?

The number of centimeters in an inch ($$1 \text{ in.} = 2.54 \text{ cm})$$

Q: Which of the following conversion factors is exact?

$$1 \text{ in.} = 2.54 \text{ cm}$$

Q: When converting $$25.0 cm$^3 to in$^3$$ using $$1 \text{ in.} = 2.54 \text{ cm}$$, which conversion factor should be used?

$$\left( \frac{1 \text{ in.}}{2.54 \text{ cm}} \$$right)^3$$

Question 1

Which of the following numbers is correctly expressed in scientific notation?

Accepted Answer

$$4.5 	imes 10^1$

Question 2

A student measures the mass of a sample as 0.00450 g. How many significant figures does this measurement have?

Accepted Answer

3

Question 3

Which of the following is an exact number?

Accepted Answer

The number of centimeters in an inch ($$1 	ext{ in.} = 2.54 	ext{ cm})$$

Question 4

Which of the following statements about significant figures is correct?

Accepted Answer

Trailing zeros after a decimal point are significant.

Question 5

A student adds $$12.11 g$$, $$0.034 g$$, and $$1.2 g. $$What is the correct sum, rounded according to the rules for significant figures?

Accepted Answer

$$13.3 g$$

Question 6

Which of the following is the correct SI base unit for mass?

Accepted Answer

kilogram (kg)

Question 7

Convert $$0.00345 to $$scientific notation.

Accepted Answer

$$3.45 	imes 10$$^{-3}$$

Question 8

A block of titanium has a mass of $$90.0 g $$and a volume of $$20.0 cm$^3. $$What is its density?

Accepted Answer

$$4.50 g/cm$^3$$

Question 9

Which of the following conversion factors is exact?

Accepted Answer

$$1 	ext{ in.} = 2.54 	ext{ cm}$$

Question 10

A sample of ethanol has a mass of $$15.8 g $$and a density of $$0.789 g/mL. $$What is its volume, rounded to the correct number of significant figures?

Accepted Answer

$$12.5 mL$$

Question 11

Which prefix multiplier represents one millionth ($$0.000001$$)?

Accepted Answer

micro-

Question 12

A cube has sides of length $$2.54 cm. $$What is its volume in cubic inches? ($$1 	ext{ in.} = 2.54 	ext{ cm})$$

Accepted Answer

$$1.00 in$^3$$

Question 13

Which of the following best describes the difference between mass and weight?

Accepted Answer

Mass is a measure of matter, weight is a measure of gravitational pull.

Question 14

A student multiplies $$2.02 	imes 89.665 	imes 0.10. $$According to the rules for significant figures, how many significant figures should the final answer have?

Accepted Answer

2

Question 15

Which of the following is a derived SI unit?

Accepted Answer

cubic meter (m$$^3)$$

Question 16

A solution map is most useful for which type of problem?

Accepted Answer

Unit conversion problems

Question 17

A student needs to measure $$68.4 g of a $$liquid with a density of $$1.32 g/mL. $$What volume should be measured?

Accepted Answer

$$51.8 mL$$

Question 18

Which of the following numbers is ambiguous in terms of significant figures and should be avoided in scientific reporting?

Accepted Answer

$$3500$$

Question 19

When converting $$25.0 cm$^3 to in$^3$$ using $$1 	ext{ in.} = 2.54 	ext{ cm}$$, which conversion factor should be used?

Accepted Answer

$$\left( \frac{1 	ext{ in.}}{2.54 	ext{ cm}} \$$right)^3$$

Question 20

A student performs the calculation $$3.489 	imes (5.67 - 2.3). $$According to the rules for significant figures, what is the correct final answer?

Accepted Answer

$$12$$

Measurement and Problem Solving in Chemistry: Scientific Notation, Significant Figures, and Unit Conversions

Guida di studio - Domande di pratica

Study guide - Flashcard