Q: Which of the following is a correct conversion factor for changing inches to centimeters?

$$2.54 \text{ cm} / 1 \text{ in.}$$

Q: A student needs to convert 250 mL to liters. Which calculation is correct?

$$250 \text{ mL} \times \frac{1 \text{ L}}{1000 \text{ mL}}$$

Q: Which of the following is a correct statement about the energy unit 'Joule'?

$$1 \text{ J} = 1 \text{ kg} \cdot \text{m}^2 / \text{s}^2$$

Question 1

Which of the following best describes a compound?

Accepted Answer

A substance composed of two or more elements in a fixed, definite proportion.

Question 2

Which of the following is an example of an intensive property?

Accepted Answer

Density

Question 3

Which group in the periodic table contains the noble gases?

Accepted Answer

Group 8A

Question 4

A student measures the mass of a sample three times and gets values that are very close to each other, but far from the true value. This is an example of:

Accepted Answer

Low accuracy, high precision

Question 5

Which of the following is a physical property?

Accepted Answer

Boiling point

Question 6

Which law states that the total mass of substances present after a chemical reaction is the same as the mass before the reaction?

Accepted Answer

Law of Conservation of Mass

Question 7

Which of the following elements is a halogen?

Accepted Answer

Br

Question 8

What is the formula for calculating the density of a substance?

Accepted Answer

$$D = m/V$$

Question 9

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 10

A sample of water is heated from 20°C to 80°C. In which direction does heat flow?

Accepted Answer

From the surroundings to the water

Question 11

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

Accepted Answer

Elements in the same group have similar chemical properties.

Question 12

Which of the following is a polyatomic cation?

Accepted Answer

$$NH_4$$^+$$

Question 13

What is the empirical formula for a compound with the molecular formula $$C_6H_{12}O_6$?

Accepted Answer

$$CH_2O$$

Question 14

Which of the following is a correct conversion factor for changing inches to centimeters?

Accepted Answer

$$2.54 	ext{ cm} / 1 	ext{ in.}$$

Question 15

Which of the following is a diatomic molecule?

Accepted Answer

$$O_2$$

Question 16

A student needs to convert 250 mL to liters. Which calculation is correct?

Accepted Answer

$$250 	ext{ mL} 	imes \frac{1 	ext{ L}}{1000 	ext{ mL}}$$

Question 17

Which of the following is a correct statement about ions?

Accepted Answer

Cations are formed when an atom loses electrons.

Question 18

Which of the following is a correct formula for an ionic compound formed between magnesium and chlorine?

Accepted Answer

$$MgCl_2$$

Question 19

Which of the following is the correct name for $$Na_2SO_4$$?

Accepted Answer

Sodium sulfate

Question 20

Which of the following is a correct statement about the energy unit 'Joule'?

Accepted Answer

$$1 	ext{ J} = 1 	ext{ kg} \cdot 	ext{m}^2 / 	ext{s}^2$$

General Chemistry Study Notes: Matter, Measurement, Atoms, Molecules, and Ions

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