Q: What is the correct conversion factor to change inches to centimeters?

$$1 \text{ in} = 2.54 \text{ cm}$$

Q: A jet is fueled with $$173,231 \text{ L} of $$jet fuel. If the density of the fuel is $$0.768 \text{ g/cm}^3$$, what is the mass of the fuel in kilograms?

$$1.33 \times 10^5$ \text{ kg}$$

Q: What is the volume of a cylinder with a radius of 0.55 cm and a length of 1.94 cm?

$$V = \pi (0.55 \text{ cm})^2$ (1.94 \text{ cm})$$

Question 1

Which statement best describes the Law of Conservation of Mass?

Accepted Answer

The total mass of reactants equals the total mass of products in a chemical reaction.

Question 2

A mixture of methane and oxygen weighing 52 g is reacted to form carbon dioxide and water. What will be the mass of the resulting mixture?

Accepted Answer

52 g

Question 3

Which of the following is the correct number of significant figures in the result of $$\frac{131 - 86.7}{53.09}$$?

Accepted Answer

0.83

Question 4

What is the correct conversion factor to change inches to centimeters?

Accepted Answer

$$1 	ext{ in} = 2.54 	ext{ cm}$$

Question 5

A jet is fueled with $$173,231 	ext{ L} of $$jet fuel. If the density of the fuel is $$0.768 	ext{ g/cm}^3$$, what is the mass of the fuel in kilograms?

Accepted Answer

$$1.33 	imes 10^5$ 	ext{ kg}$$

Question 6

Which subatomic particle defines the element?

Accepted Answer

Proton

Question 7

What is the mass number of an isotope with 10 protons and 12 neutrons?

Accepted Answer

22

Question 8

Which ion has 26 electrons?

Accepted Answer

Fe$$^{3+}$$

Question 9

According to Dalton’s Atomic Theory, which statement is FALSE?

Accepted Answer

Atoms of one element can change into atoms of another element during a chemical reaction.

Question 10

Which law states that all samples of a given compound have the same proportions of their constituent elements?

Accepted Answer

Law of Definite Proportions

Question 11

If a sample of ammonia contains 10.0 g of H, and the mass ratio of nitrogen to hydrogen in ammonia is 4.7:1, how many grams of N does it contain?

Accepted Answer

47 g

Question 12

Which of the following best describes the Law of Multiple Proportions?

Accepted Answer

When two elements form more than one compound, the masses of one element that combine with a fixed mass of the other are in ratios of small whole numbers.

Question 13

In nitrogen dioxide ($$NO_2$$), the mass ratio of oxygen to nitrogen is 2.28. Another compound of oxygen and nitrogen has an O/N mass ratio of 2.86. What is the formula of the compound?

Accepted Answer

$$N_2O_5$$

Question 14

Which subatomic particle is responsible for the charge of an atom?

Accepted Answer

Electron

Question 15

What is the correct scientific notation for 0.00232?

Accepted Answer

$$2.32 	imes 10$$^{-3}$$

Question 16

Which of the following statements about isotopes is TRUE?

Accepted Answer

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

Question 17

Which particle has the smallest relative mass?

Accepted Answer

Electron

Question 18

What is the volume of a cylinder with a radius of 0.55 cm and a length of 1.94 cm?

Accepted Answer

$$V = \pi (0.55 	ext{ cm})^2$ (1.94 	ext{ cm})$$

Question 19

Which of the following is NOT a step in unit conversions and dimensional analysis?

Accepted Answer

Guess the answer based on intuition

Question 20

Which of the following is a real-world application of the Law of Definite Proportions?

Accepted Answer

Sugar from different sources has the same chemical composition.

General Chemistry Study Notes: Matter, Measurement, Atomic Structure, and Subatomic Particles

Study Guide - Practice Questions

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