Q: Which of the following is the correct conversion factor to convert 5.0 liters to milliliters?

$$1 \text{ liter} = 1000 \text{ milliliters}$$

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

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

Q: Which of the following is the correct formula for percent composition of an element in a compound?

$$\text{Percent Composition} = \frac{\text{Mass of Element}}{\text{Total Mass of Compound}} \times 100\%$$

Question 1

Which of the following best describes a homogeneous mixture?

Accepted Answer

A mixture in which the composition is uniform throughout, such as salt dissolved in water.

Question 2

A student measures the mass of a sample three times and gets values of 2.50 g, 2.51 g, and 2.49 g. The true mass is 2.80 g. Which statement best describes the accuracy and precision of these measurements?

Accepted Answer

The measurements are precise but not accurate.

Question 3

Which of the following is a chemical property?

Accepted Answer

Ability to react with oxygen to form rust.

Question 4

Which of the following is the correct scientific notation for 0.00056?

Accepted Answer

$$5.6 	imes 10$$^{-4}$$

Question 5

A compound contains 40.0% carbon, 6.7% hydrogen, and 53.3% oxygen by mass. What is the empirical formula of the compound?

Accepted Answer

$$\mathrm{CH_2O}$$

Question 6

Which of the following is NOT a method for separating mixtures?

Accepted Answer

Electrolysis

Question 7

Which of the following statements about isotopes is correct?

Accepted Answer

Isotopes of an element have the same number of protons but different numbers of neutrons.

Question 8

Which of the following is the correct conversion factor to convert 5.0 liters to milliliters?

Accepted Answer

$$1 	ext{ liter} = 1000 	ext{ milliliters}$$

Question 9

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

Accepted Answer

Energy cannot be created or destroyed, only transformed from one form to another.

Question 10

A radioactive isotope undergoes beta decay. Which of the following correctly describes what happens?

Accepted Answer

A neutron in the nucleus is converted into a proton, and a beta particle (electron) is emitted.

Question 11

Which of the following is the correct formula for calculating density?

Accepted Answer

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

Question 12

Which of the following is a physical change?

Accepted Answer

Melting of ice into water.

Question 13

Which of the following is a transition metal?

Accepted Answer

Iron (Fe)

Question 14

Which of the following best explains why nuclear fission is used in power plants?

Accepted Answer

It releases a large amount of energy by splitting heavy nuclei such as uranium.

Question 15

Which of the following is the correct formula for percent composition of an element in a compound?

Accepted Answer

$$	ext{Percent Composition} = \frac{	ext{Mass of Element}}{	ext{Total Mass of Compound}} 	imes 100\%$$

Question 16

Which of the following is a correct statement about the periodic table?

Accepted Answer

Elements in the same group have similar chemical properties.

Question 17

Which of the following is the correct nuclear equation for alpha decay of $$^{238}_{92}\mathrm{U}$$?

Accepted Answer

$$^{238}_{92}\mathrm{U} \$$rightarrow ^{234}$$_{90}\mathrm{Th} $$+ ^{4}$$_{2}\mathrm{He}$$

Question 18

A sample contains 3.0 moles of sodium chloride ($$\mathrm{NaCl}). $$How many formula units are present in the sample? ($$N_A = 6.022 	imes 10$$^{23}$$)

Accepted Answer

$$1.81 	imes 10$$^{24}$$ formula units

Question 19

Which of the following is a correct statement about ions?

Accepted Answer

An anion is an ion with a negative charge.

Question 20

Which of the following is the correct order of electromagnetic radiation from lowest to highest energy?

Accepted Answer

Radio waves, visible light, gamma rays

Introduction to Chemistry: Key Concepts, Measurement, Atomic Structure, and Nuclear Chemistry

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