$$1 \text{ qt} = 1.057 \text{ L}$$

$$\text{Density} = \frac{\text{mass}}{\text{volume}}$$

Question 1

Which of the following best describes a chemical change?

Accepted Answer

Iron rusting when exposed to air

Question 2

Which statement about isotopes is correct?

Accepted Answer

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

Question 3

A sample of carbon-14 is found to have 25% of its original amount remaining. If the half-life of carbon-14 is 5730 years, how old is the sample?

Accepted Answer

$$11460 	ext{ years}$$

Question 4

Which of the following is a correct example of a homogeneous mixture?

Accepted Answer

Salt dissolved in water

Question 5

What is the correct symbol for the element calcium?

Accepted Answer

Ca

Question 6

Which of the following is the correct scientific notation for 0.000012?

Accepted Answer

$$1.2 	imes 10$$^{-5}$$

Question 7

How many significant figures are in the measurement 2.500 g?

Accepted Answer

4

Question 8

Which of the following is the correct conversion factor to convert 1 quart to liters?

Accepted Answer

$$1 	ext{ qt} = 1.057 	ext{ L}$$

Question 9

A patient receives 250 mL of a solution. How many liters is this?

Accepted Answer

$$0.250 	ext{ L}$$

Question 10

Which of the following best describes the difference between a physical and a chemical change?

Accepted Answer

A chemical change results in the formation of new substances, while a physical change does not.

Question 11

Which of the following is a correct example of a polyatomic ion?

Accepted Answer

OH-

Question 12

What is the correct formula for calculating density?

Accepted Answer

$$	ext{Density} = \frac{	ext{mass}}{	ext{volume}}$$

Question 13

Which of the following statements about the law of conservation of energy is correct?

Accepted Answer

Energy cannot be created or destroyed, only transformed.

Question 14

A food item contains 220 Calories. How many calories is this?

Accepted Answer

$$220,000 	ext{ calories}$$

Question 15

Which of the following is the correct relationship between Celsius and Kelvin?

Accepted Answer

$$K = ^\circ C + 273$$

Question 16

Which type of nuclear radiation is most penetrating and can affect cells deep within the body?

Accepted Answer

Gamma rays

Question 17

What is the charge and location of a proton in an atom?

Accepted Answer

Positive, in the nucleus

Question 18

Which of the following ions is named using Roman numerals to indicate its charge?

Accepted Answer

Fe2+

Question 19

Which of the following elements is a noble gas?

Accepted Answer

Neon

Question 20

Which formula correctly calculates the maximum number of electrons in an energy level?

Accepted Answer

$$2n^2$$

GOB Chemistry Study Notes: Matter, Measurement, Radioactivity, and How Elements Combine

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