Q: A student measures the boiling point of water as 99.8°C, while the accepted value is 100.0°C. What is the percent error?

$$\frac{100.0 - 99.8}{100.0} \times 100\% = 0.2\%$$

Question 1

Which of the following best describes the main difference between organic and inorganic chemistry?

Accepted Answer

Organic chemistry focuses on chemicals containing carbon, while inorganic chemistry focuses on chemicals that do not contain carbon.

Question 2

A scientist is measuring the mass and volume of a rock to determine its density. If the mass is 250 g and the volume is 50 mL, what is the density of the rock?

Accepted Answer

$$\frac{250}{50} = 5\ \mathrm{g/mL}$$

Question 3

Which statement about the density of a substance is correct?

Accepted Answer

Density is an intensive property and depends on the composition of the substance.

Question 4

Which of the following is an example of a physical property?

Accepted Answer

Boiling point

Question 5

A student records the length of a table as 2.50 meters. How many significant figures are in this measurement?

Accepted Answer

3

Question 6

Which of the following is considered an exact number and therefore has an infinite number of significant figures?

Accepted Answer

The number of students in a classroom

Question 7

Which step in the scientific method involves making a testable prediction based on observations?

Accepted Answer

Formulating a hypothesis

Question 8

If a measurement is close to the accepted value, it is said to be:

Accepted Answer

Accurate

Question 9

Which of the following statements about solids is true?

Accepted Answer

Solids have a definite shape and volume.

Question 10

A scientist writes the number 0.0000312 in scientific notation. Which is the correct representation?

Accepted Answer

$$3.12 	imes 10$$^{-5}$$

Question 11

Which of the following is NOT a reason to study chemistry according to the provided materials?

Accepted Answer

To avoid using the scientific method

Question 12

Early alchemists contributed to modern chemistry by:

Accepted Answer

Developing practical laboratory procedures such as distillation and extraction

Question 13

Which measurement is most likely to be both correct and reproducible?

Accepted Answer

A measurement that is both accurate and precise

Question 14

If the density of a liquid decreases as temperature increases, which of the following best explains why?

Accepted Answer

The volume of the liquid increases while the mass remains the same.

Question 15

Which of the following is a qualitative observation?

Accepted Answer

The solution is blue in color.

Question 16

A student measures the boiling point of water as 99.8°C, while the accepted value is 100.0°C. What is the percent error?

Accepted Answer

$$\frac{100.0 - 99.8}{100.0} 	imes 100\% = 0.2\%$$

Question 17

Which of the following is a correct example of a measurement in the SI/Metric system?

Accepted Answer

7.62 cm

Question 18

Which of the following is NOT a step in the scientific method?

Accepted Answer

Ignoring data that does not fit the hypothesis

Question 19

A sample has a mass of 120 g and a volume of 30 mL. If the temperature increases and the volume expands to 36 mL, what is the new density?

Accepted Answer

$$\frac{120}{36} = 3.33\ \mathrm{g/mL}$$

Question 20

Which of the following best describes a measurement with high precision but low accuracy?

Accepted Answer

Measurements are close to each other but far from the accepted value.

Introduction to Chemistry and Matter: Foundations for Biology

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