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

Question 1

Which of the following best describes a mixture that is homogeneous?

Accepted Answer

A solution of salt dissolved in water

Question 2

Which of the following is the correct symbol and atomic number for the element with 57 protons?

Accepted Answer

La, 57

Question 3

Which of the following is a physical property?

Accepted Answer

Melting point

Question 4

A patient’s temperature is measured as 101.5 °F. What is this temperature in Celsius? Use the formula $$C = \frac{5}{9}(F - 32).$$

Accepted Answer

38.6 °C

Question 5

Which of the following is the correct conversion for 2.85 kg to pounds? (1 kg = 2.205 lb)

Accepted Answer

6.28 lb

Question 6

Which of the following elements is most likely to form a cation?

Accepted Answer

Na

Question 7

Which of the following ions is polyatomic?

Accepted Answer

$$SO_4$$^{2-}$$

Question 8

Which of the following best describes the process of beta decay?

Accepted Answer

A neutron in the nucleus converts to a proton and emits an electron

Question 9

Which of the following is the correct balanced nuclear equation for the alpha decay of $$^{226}_{88}Ra$$?

Accepted Answer

$$^{226}_{88}Ra \$$rightarrow ^{222}$$_{86}Rn $$+ ^{4}$$_{2}He$$

Question 10

Which of the following statements about isotopes is correct?

Accepted Answer

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

Question 11

A radioactive isotope has a half-life of 6 hours. If you start with 80 mg, how much remains after 18 hours?

Accepted Answer

10 mg

Question 12

Which of the following is the correct electron configuration for a neutral atom of oxygen?

Accepted Answer

$$1s^2$$\ $$2s^2$$\ $$2p^4$$

Question 13

Which of the following best explains why noble gases are chemically inert?

Accepted Answer

They have a complete octet of electrons in their outermost shell

Question 14

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

Accepted Answer

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

Question 15

Which of the following is a correct statement about ions?

Accepted Answer

Cations are positively charged because they have lost electrons

Question 16

Which of the following is the correct balanced equation for the beta decay of $$^{14}_{6}C$$?

Accepted Answer

$$^{14}_{6}C \$$rightarrow ^{14}$$_{7}N $$+ ^{0}$$_{-1}e$$

Question 17

Which of the following is a real-world application of gamma radiation?

Accepted Answer

Sterilization of medical equipment

Question 18

Which of the following ions is isoelectronic with neon ($$Ne$$)?

Accepted Answer

$$O^{2-}$$

Question 19

Which of the following best describes the difference between atomic number and mass number?

Accepted Answer

Atomic number is the number of protons; mass number is the sum of protons and neutrons

Question 20

A sample of gas has a mass of 2.50 g and occupies a volume of 1.20 L. What is its density?

Accepted Answer

$$2.08\ 	ext{g/L}$$

CHEM 1150 Exam 1 Study Guide: GOB Chemistry Fundamentals

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