Q: Convert 0.000345 m to scientific notation.

$$3.45 \times 10$$^{-4}$$\ \mathrm{m}$$

Q: A student needs to convert 250 milliliters (mL) to liters (L). Which of the following is the correct conversion and answer?

$$250\ \mathrm{mL} \times \frac{1\ \mathrm{L}}{1000\ \mathrm{mL}} = 0.250\ \mathrm{L}$$

Question 1

Which of the following best describes the difference between a compound and a mixture?

Accepted Answer

A compound is composed of two or more elements chemically combined in a fixed ratio, while a mixture contains two or more substances physically combined in variable proportions.

Question 2

Which of the following is a physical change?

Accepted Answer

Boiling water to produce steam.

Question 3

A sample of gold has a mass of 96.5 g and a volume of 5.00 cm$$^3. $$What is the density of gold?

Accepted Answer

$$d = \frac{m}{V} = \frac{96.5\ \mathrm{g}}{5.00\ \mathrm{cm}^3} = 19.3\ \mathrm{g/cm}^3$$

Question 4

Which of the following statements about the states of matter is correct?

Accepted Answer

Liquids have a definite volume but an indefinite shape.

Question 5

Which separation technique would be most appropriate to separate a mixture of sand and salt water?

Accepted Answer

Filtration

Question 6

How many significant figures are in the measurement 0.004560?

Accepted Answer

4

Question 7

Convert 0.000345 m to scientific notation.

Accepted Answer

$$3.45 	imes 10$$^{-4}$$\ \mathrm{m}$$

Question 8

Which of the following is the correct SI unit for mass?

Accepted Answer

kilogram (kg)

Question 9

A student needs to convert 250 milliliters (mL) to liters (L). Which of the following is the correct conversion and answer?

Accepted Answer

$$250\ \mathrm{mL} 	imes \frac{1\ \mathrm{L}}{1000\ \mathrm{mL}} = 0.250\ \mathrm{L}$$

Question 10

Which of the following best describes the Law of Conservation of Mass?

Accepted Answer

Mass is neither created nor destroyed in a chemical reaction.

Question 11

Which of the following is a homogeneous mixture?

Accepted Answer

Salt water

Question 12

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

Accepted Answer

micro-

Question 13

A student records a measurement as 2.300 × 10$$^3 g. $$How many significant figures does this value have?

Accepted Answer

4

Question 14

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

Accepted Answer

Iron rusts in the presence of oxygen.

Question 15

Which of the following is the correct formula for density?

Accepted Answer

$$d = \frac{m}{V}$$

Question 16

Which of the following is the correct name for the compound N$$_2O$_4$$?

Accepted Answer

Dinitrogen tetroxide

Question 17

Which of the following is a property of gases but not of solids or liquids?

Accepted Answer

Compressibility

Question 18

Which of the following is the correct SI base unit for temperature?

Accepted Answer

kelvin (K)

Question 19

Which of the following best describes a heterogeneous mixture?

Accepted Answer

A mixture in which the composition is not uniform throughout.

General Chemistry I: Matter, Measurement, Atoms, and Compounds (Chapters 1–3) – Exam 1 Review

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