Q: Which conversion factor would you use to convert inches to centimeters?

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

Q: A student wants to convert $$50.0\ \text{in}^2 to$$ $$\text{ft}^2. $$Which conversion factor should be used and how?

Use $$(1\ \text{ft}/12\ \text{in})^2$ and multiply 50.0$$\ \text{in}^2$$ by this factor.

Q: A student needs to convert $$125$$ miles to meters. Which sequence of conversion factors is correct?

$$125\ \text{mi} \times \frac{5280\ \text{ft}}{1\ \text{mi}} \times \frac{12\ \text{in}}{1\ \text{ft}} \times \frac{2.54\ \text{cm}}{1\ \text{in}} \times \frac{1\ \text{m}}{100\ \text{cm}}$$

Question 1

Which of the following is a quantitative measurement?

Accepted Answer

The mass of the sample is 5.01 kg.

Question 2

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

Accepted Answer

Mole (mol)

Question 3

A scientist measures the temperature of boiling water as $$100\ ^\circ C. $$What is this temperature in Kelvin?

Accepted Answer

$$373.15\ K$$

Question 4

Which of the following statements about the SI system is TRUE?

Accepted Answer

The SI system is legally used in every country in the world, with few exceptions.

Question 5

If a student records the mass of a coin as 5.01 g, how many significant figures are in this measurement?

Accepted Answer

3

Question 6

Which of the following is an example of an extensive property?

Accepted Answer

Mass

Question 7

A student adds $$2.34$$ and $$0.059. $$What is the correct answer with the proper number of significant figures?

Accepted Answer

$$2.4$$

Question 8

Which conversion factor would you use to convert inches to centimeters?

Accepted Answer

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

Question 9

A measurement is recorded as $$0.03450. $$How many significant figures does this number have?

Accepted Answer

5

Question 10

Which of the following is an exact number?

Accepted Answer

The number of eggs in a dozen

Question 11

A student multiplies $$6.78 by$$ $$5.903$$ and then by $$(5.489 - 5.01). $$What is the correct answer with the proper number of significant figures?

Accepted Answer

$$19$$

Question 12

Which of the following is the correct relationship for converting Celsius to Kelvin?

Accepted Answer

$$T(K) = T(\ ^\circ C) + 273.15$$

Question 13

Which of the following is a derived SI unit?

Accepted Answer

Joule (J)

Question 14

A student wants to convert $$50.0\ 	ext{in}^2 to$$ $$	ext{ft}^2. $$Which conversion factor should be used and how?

Accepted Answer

Use $$(1\ 	ext{ft}/12\ 	ext{in})^2$ and multiply 50.0$$\ 	ext{in}^2$$ by this factor.

Question 15

Which of the following is NOT a base SI unit?

Accepted Answer

Joule (J)

Question 16

A student measures the length of a pencil as $$15.0\ 	ext{cm}. $$What is the uncertainty in this measurement?

Accepted Answer

$$\pm 0.1\ 	ext{cm}$$

Question 17

Which of the following is the correct way to round $$67.38 to $$three significant figures?

Accepted Answer

$$67.4$$

Question 18

Which property does NOT depend on the quantity of matter present?

Accepted Answer

Density

Question 19

Which of the following is the correct scientific notation for $$150$$ with three significant figures?

Accepted Answer

$$1.50 	imes 10^2$

Question 20

A student needs to convert $$125$$ miles to meters. Which sequence of conversion factors is correct?

Accepted Answer

$$125\ 	ext{mi} 	imes \frac{5280\ 	ext{ft}}{1\ 	ext{mi}} 	imes \frac{12\ 	ext{in}}{1\ 	ext{ft}} 	imes \frac{2.54\ 	ext{cm}}{1\ 	ext{in}} 	imes \frac{1\ 	ext{m}}{100\ 	ext{cm}}$$

Measurement and Description of Matter in Chemistry

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