Question 1

Which of the following best describes a chemical property of a substance?

Accepted Answer

The substance's explosive nature

Question 2

A 35-gram sample of potassium reacts completely with chlorine to form 67 grams of potassium chloride. According to the law of conservation of mass, how many grams of chlorine reacted?

Accepted Answer

32 g

Question 3

Convert the boiling point of water, $$100.00\ ^\circ\mathrm{C}$$, to Kelvin.

Accepted Answer

$$373.15\ \mathrm{K}$$

Question 4

A European doctor reports a patient's fever as $$39.2\ ^\circ\mathrm{C}. $$What is this temperature in degrees Fahrenheit?

Accepted Answer

$$102.6\ ^\circ\mathrm{F}$$

Question 5

Which statement is NOT part of Dalton’s Atomic Theory?

Accepted Answer

Atoms are themselves composed of protons, neutrons, and electrons.

Question 6

Which element is a halogen?

Accepted Answer

I

Question 7

Which statement best summarizes the nuclear model of the atom that emerged from Rutherford’s Gold Foil Experiment?

Accepted Answer

The atom is composed of a dense core that contains most of its mass & all of its positive charge, while low-mass negatively charged particles compose most of its volume.

Question 8

An ion is composed of 8 protons, 8 neutrons, and 10 electrons. What is its atomic mass and charge?

Accepted Answer

Atomic mass: $$16\ \mathrm{amu}$$, Charge: $$2-$$

Question 9

Determine the number of protons, neutrons, and electrons in the isotope $$\mathrm{^{32}_{16}S$$^{2-}$$}.$$

Accepted Answer

16 protons, 16 neutrons, 18 electrons

Question 10

How many neutrons does the isotope $$\mathrm{^{56}Fe}$$ contain?

Accepted Answer

30

Question 11

A runner can travel $$4875\ \mathrm{ft} in$$ $$6.85$$ minutes. What is the runner’s average speed in miles per hour? ($$1\ \mathrm{mile} = 5280\ \mathrm{ft})$$

Accepted Answer

$$8.807\ \mathrm{mi/hr}$$

Question 12

A cube measures $$2.5\ \mathrm{cm} on $$each edge and has a mass of $$66.9\ \mathrm{g}. $$What is the density of the material that composes the cube?

Accepted Answer

$$4.3\ \mathrm{g/cm^3$}$$

Question 13

Which of the following is considered a chemical change?

Accepted Answer

A forest fire

Question 14

Which pair of elements has the most similar properties?

Accepted Answer

Sr and Ba

Question 15

What is the charge of the most common ion of fluorine?

Accepted Answer

$$1-$$

Question 16

Express the number $$0.000042 in $$scientific notation.

Accepted Answer

$$4.2 	imes 10$$^{-5}$$

Question 17

Round the number $$89.04997 to $$three significant figures.

Accepted Answer

$$89.1$$

Question 18

Perform the following multiplication to the correct number of significant figures: $$65.2 	imes 0.0015 	imes 12.02$$

Accepted Answer

$$1.2$$

Question 19

A sample of a liquid has a density of $$0.880\ \mathrm{g/mL}. $$What is the mass of $$225\ \mathrm{mL} of $$this liquid?

Accepted Answer

$$198\ \mathrm{g}$$

Question 20

Which statement about protons is FALSE?

Accepted Answer

Protons have approximately the same mass as electrons

Introductory Chemistry Exam 1 Review – Step-by-Step Study Guidance

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