Q: A scientist measures the mass of a sample as 250 g and its volume as 50 mL. What is the density of the sample?

$$\text{Density} = \frac{250\,\text{g}}{50\,\text{mL}} = 5\,\text{g/mL}$$

Q: A student wants to convert 5.0 inches to centimeters. Which equivalence statement should they use?

$$1\,\text{inch} = 2.54\,\text{cm}$$

Q: A sample of gold has a mass of 96 g and a volume of 5.0 cm$$^3. $$What is its density?

$$\text{Density} = \frac{96\,\text{g}}{5.0\,\text{cm}^3} = 19.2\,\text{g/cm}^3$$

Q: A thermometer reads 25$$^\circC. $$What is this temperature in Kelvin?

$$25 + 273.15 = 298.15\,\text{K}$$

Q: Which of the following is the correct formula for calculating the Desirability Quotient?

$$\text{Desirability Quotient} = \frac{\text{Benefits}}{\text{Risks}}$$

Question 1

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

Accepted Answer

Mass is the amount of matter in an object and remains constant, while weight is the force of gravity on that object and can change with location.

Question 2

A scientist measures the mass of a sample as 250 g and its volume as 50 mL. What is the density of the sample?

Accepted Answer

$$	ext{Density} = \frac{250\,	ext{g}}{50\,	ext{mL}} = 5\,	ext{g/mL}$$

Question 3

Which of the following is an example of a chemical change?

Accepted Answer

Burning wood to produce ash and gases.

Question 4

Which of the following statements about scientific theories is correct?

Accepted Answer

A scientific theory is a tentative explanation that can change with new evidence.

Question 5

Which of the following is a homogeneous mixture?

Accepted Answer

Salt dissolved in water.

Question 6

A student wants to convert 5.0 inches to centimeters. Which equivalence statement should they use?

Accepted Answer

$$1\,	ext{inch} = 2.54\,	ext{cm}$$

Question 7

Which of the following is NOT a characteristic of science?

Accepted Answer

Absolute certainty

Question 8

Which of the following best describes an element?

Accepted Answer

A pure substance that cannot be broken down into simpler substances by chemical means.

Question 9

Which of the following is the correct symbol for the element with the Latin name 'Aurum'?

Accepted Answer

Au

Question 10

A sample of gold has a mass of 96 g and a volume of 5.0 cm$$^3. $$What is its density?

Accepted Answer

$$	ext{Density} = \frac{96\,	ext{g}}{5.0\,	ext{cm}^3} = 19.2\,	ext{g/cm}^3$$

Question 11

Which of the following is a physical property?

Accepted Answer

Melting point

Question 12

Which of the following prefixes means one thousandth ($$10^{-3}) of a $$unit?

Accepted Answer

milli-

Question 13

A thermometer reads 25$$^\circC. $$What is this temperature in Kelvin?

Accepted Answer

$$25 + 273.15 = 298.15\,	ext{K}$$

Question 14

Which of the following is an example of a heterogeneous mixture?

Accepted Answer

Oil and water

Question 15

Which of the following best describes the role of technology in science?

Accepted Answer

Technology is the application of scientific knowledge to solve practical problems.

Question 16

A student measures the mass of an object four times and gets values very close to each other, but far from the accepted value. This is an example of:

Accepted Answer

Poor accuracy, good precision

Question 17

Which of the following is a compound?

Accepted Answer

H$$_2O$$

Question 18

Which of the following is the correct formula for calculating the Desirability Quotient?

Accepted Answer

$$	ext{Desirability Quotient} = \frac{	ext{Benefits}}{	ext{Risks}}$$

Question 19

Which of the following is an example of applied research?

Accepted Answer

Developing a new drug to treat a disease.

Chapter 1: The Chemical World – Foundations of Chemistry

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