Q: Which of the following is the correct conversion factor to change milligrams to grams?

$$1\text{ mg} = 10$$^{-3}$$\text{ g}$$

Q: A student needs to convert 25 cm to nanometers. Which sequence of conversion factors should be used?

$$\text{cm} \rightarrow \text{m} \rightarrow \text{nm}$$

Q: Which of the following is the correct relationship between milliliters and cubic centimeters?

$$1\text{ mL} = 1\text{ cm}^3$$

Question 1

Which of the following is NOT considered a base unit in the International System of Units (SI)?

Accepted Answer

liter (L)

Question 2

A chemist measures the mass of a sample as 0.0000678 g. Express this value in scientific notation.

Accepted Answer

$$6.78 	imes 10$$^{-5}$$ g

Question 3

Which of the following measurements has the greatest number of significant figures?

Accepted Answer

56.047

Question 4

A graduated cylinder is used to measure the volume of a liquid. The correct way to express a reading of 1 mL, considering significant figures, is:

Accepted Answer

1.0 mL

Question 5

Convert 45 inches to centimeters using the exact conversion factor $$1	ext{ in} = 2.54	ext{ cm}. $$How many significant figures should your answer have?

Accepted Answer

3

Question 6

Which of the following statements best describes the difference between precision and accuracy?

Accepted Answer

Precision refers to how close measurements are to each other; accuracy refers to how close measurements are to the true value.

Question 7

A student records the following masses: 25.3 g, 25.7 g, and 24.9 g. These measurements are:

Accepted Answer

Precise

Question 8

Which metric prefix represents $$10^{-6}$$?

Accepted Answer

micro

Question 9

A sample of mercury has a mass of 8.35 g and a density of $$13.2	ext{ g/mL}. $$What volume does it occupy?

Accepted Answer

$$0.633	ext{ mL}$$

Question 10

Which of the following is the correct formula for density?

Accepted Answer

$$D = \dfrac{M}{V}$$

Question 11

A measurement is recorded as 21.65°C ± 0.01°C. Which device most likely made this measurement?

Accepted Answer

A thermometer with markings every 0.1°C

Question 12

Which of the following is a derived SI unit?

Accepted Answer

joule (J)

Question 13

A student multiplies $$2.512 by$$ $$5.1$$ and gets $$12.8112. $$How should the answer be rounded according to significant figures?

Accepted Answer

$$13$$

Question 14

Which of the following is the correct conversion factor to change milligrams to grams?

Accepted Answer

$$1	ext{ mg} = 10$$^{-3}$$	ext{ g}$$

Question 15

Which of the following is the correct way to express 3,000,000,000 seconds in scientific notation?

Accepted Answer

$$3.0 	imes 10$$^{9}$$ s

Question 16

A student needs to convert 25 cm to nanometers. Which sequence of conversion factors should be used?

Accepted Answer

$$	ext{cm} ightarrow 	ext{m} ightarrow 	ext{nm}$$

Question 17

Which of the following is NOT a quantitative measurement?

Accepted Answer

The solution turned blue

Question 18

Which of the following is the correct relationship between milliliters and cubic centimeters?

Accepted Answer

$$1	ext{ mL} = 1	ext{ cm}^3$$

Question 19

A student subtracts $$21.765$$ from $$40.2$$ and gets $$18.435. $$How should the answer be rounded according to significant figures?

Accepted Answer

$$18.4$$

Question 20

Which of the following laboratory devices would provide the most precise measurement of mass?

Accepted Answer

Analytical scale (+/- 0.00001 g)

Quantitative Aspects of Chemistry: Study Notes

Guida di studio - Domande di pratica

Study guide - Flashcard