Q: Which of the following is the correct formula for density?

$$\text{Density} = \frac{\text{Mass}}{\text{Volume}}$$

Q: A jet is fueled with 1.5 x $$10^5 L of $$jet fuel. If the density of jet fuel is 0.768 g/cm$$^3$$, what is the mass of the fuel in kilograms? (1 L = 1000 cm$$^3)$$

$$1.15 \times 10^5$\ \mathrm{kg}$$

Q: A household receives a $$145 electricity bill. If the cost of electricity is 0.12$ per kWh, how much energy in joules did the household use? (1$$\ \mathrm{kWh} = 3.6 \times $$10^6$$\ \mathrm{J}$)

$$4.35 \times 10^7$\ \mathrm{J}$$

Q: Which of the following is a correct example of dimensional analysis for converting 5 yards to centimeters? (1 yard = 0.9144 m, 1 m = 100 cm)

$$5\ \mathrm{yd} \times \frac{0.9144\ \mathrm{m}}{1\ \mathrm{yd}} \times \frac{100\ \mathrm{cm}}{1\ \mathrm{m}}$$

Question 1

Which of the following statements best explains why chemistry is considered the 'central science'?

Accepted Answer

Chemistry connects biology, physics, geology, and engineering by explaining the properties and interactions of matter.

Question 2

How many significant figures are in the measurement 0.0540?

Accepted Answer

3

Question 3

A scientist measures the mass of a sample as 45.000 g. How many significant figures does this measurement have?

Accepted Answer

5

Question 4

Which of the following is the correct formula to convert a temperature from Celsius to Kelvin?

Accepted Answer

$$K = ^\circ C + 273.15$$

Question 5

A graduated cylinder is used to measure which physical quantity?

Accepted Answer

Volume

Question 6

Which SI unit and symbol are correctly matched?

Accepted Answer

Temperature - Kelvin (K)

Question 7

A sample has a mass of 15.12 g and a volume of 8.0 cm$$^3. $$What is its density in g/cm$$^3$$?

Accepted Answer

$$1.89\ \mathrm{g/cm^3$}$$

Question 8

Which of the following is the correct formula for density?

Accepted Answer

$$	ext{Density} = \frac{	ext{Mass}}{	ext{Volume}}$$

Question 9

A patient weighing 22 lb needs a medication dosed at 15 mg/kg. How many mg should the patient receive? (1 kg = 2.2 lb)

Accepted Answer

$$330\ \mathrm{mg}$$

Question 10

Which of the following conversion factors would you use to convert 24 inches to feet?

Accepted Answer

$$1\ \mathrm{ft} = 12\ \mathrm{in}$$

Question 11

A jet is fueled with 1.5 x $$10^5 L of $$jet fuel. If the density of jet fuel is 0.768 g/cm$$^3$$, what is the mass of the fuel in kilograms? (1 L = 1000 cm$$^3)$$

Accepted Answer

$$1.15 	imes 10^5$\ \mathrm{kg}$$

Question 12

Which of the following is NOT a reason why chemistry matters, according to the study materials?

Accepted Answer

It is only useful for laboratory work.

Question 13

When performing the calculation $$2.345 + 0.07 + 2.9975$$, to how many decimal places should the answer be rounded?

Accepted Answer

1 decimal place

Question 14

Which of the following is the correct formula to convert Fahrenheit to Celsius?

Accepted Answer

$$^\circ C = \frac{5}{9}(^\circ F - 32)$$

Question 15

A student multiplies $$6.78 	imes 5.903 	imes (5.489 - 5.01). $$How many significant figures should the final answer have?

Accepted Answer

2

Question 16

Which SI prefix corresponds to a multiplier of $$10^{-6}$$?

Accepted Answer

micro-

Question 17

A household receives a $$145 electricity bill. If the cost of electricity is 0.12$ per kWh, how much energy in joules did the household use? (1$$\ \mathrm{kWh} = 3.6 	imes $$10^6$$\ \mathrm{J}$)

Accepted Answer

$$4.35 	imes 10^7$\ \mathrm{J}$$

Question 18

Which measuring device would provide the greatest certainty in measuring mass?

Accepted Answer

Analytical balance

Question 19

Which of the following is a correct example of dimensional analysis for converting 5 yards to centimeters? (1 yard = 0.9144 m, 1 m = 100 cm)

Accepted Answer

$$5\ \mathrm{yd} 	imes \frac{0.9144\ \mathrm{m}}{1\ \mathrm{yd}} 	imes \frac{100\ \mathrm{cm}}{1\ \mathrm{m}}$$

Units, Measurement, and Problem Solving in Chemistry and Biology

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