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

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

Question 1

Which of the following is a correct definition of an isotope?

Accepted Answer

Atoms of the same element with different numbers of neutrons.

Question 2

A sample contains 0.0040 g of a substance. How many significant figures are in this measurement?

Accepted Answer

2

Question 3

Which of the following is a physical change?

Accepted Answer

Melting ice

Question 4

What is the normal body temperature in Fahrenheit (°F)? Convert it to Celsius (°C) using the formula $$C = \frac{5}{9}(F - 32).$$

Accepted Answer

98.6 °F; 37 °C

Question 5

Which of the following is a homogeneous mixture?

Accepted Answer

Salt water

Question 6

How many significant figures are in the measurement 70650 cg?

Accepted Answer

5

Question 7

Which element is a noble gas?

Accepted Answer

Neon

Question 8

What is the charge of a proton, electron, and neutron, respectively?

Accepted Answer

+1, -1, 0

Question 9

Which of the following is a chemical change?

Accepted Answer

Burning gasoline

Question 10

If an atom has an atomic number of 17 and a mass number of 35, how many neutrons does it have?

Accepted Answer

18

Question 11

Which of the following is a covalent compound?

Accepted Answer

CO$$_2$$

Question 12

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

Accepted Answer

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

Question 13

Which group on the periodic table contains the alkali metals?

Accepted Answer

Group 1

Question 14

Which of the following is NOT a polyatomic ion?

Accepted Answer

Cl$$^-$$

Question 15

Which of the following statements about scientific notation is TRUE?

Accepted Answer

Only the coefficient digits are considered significant.

Question 16

Which of the following is a heterogeneous mixture?

Accepted Answer

Salad

Question 17

What is the mass number of an atom with 15 protons, 16 neutrons, and 15 electrons?

Accepted Answer

31

Question 18

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

Accepted Answer

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

Question 19

Which of the following elements is most likely to form a 2+ ion?

Accepted Answer

Magnesium

Question 20

Which of the following is a chemical property?

Accepted Answer

Reactivity with acid

GOB Chemistry Study Guide: Elements, Measurements, and Chemical Changes

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