Question 1

Which of the following is NOT part of Dalton's atomic theory?

Accepted Answer

Most of the atom's mass and all of its positive charge is contained in a small core called the nucleus.

Question 2

A sample of a compound contains 12 grams of carbon, 6 grams of hydrogen, and 96 grams of oxygen. What is the simplest whole-number ratio of carbon to hydrogen to oxygen in this compound?

Accepted Answer

Question 3

Which of the following statements about isotopes is TRUE?

Accepted Answer

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

Question 4

An atom of iron-56 ($$^{56}_{26}\mathrm{Fe}) $$contains how many neutrons?

Accepted Answer

$$30$$

Question 5

Which of the following elements has the lowest ionization energy?

Accepted Answer

Na

Question 6

Which of the following is an example of a chemical change?

Accepted Answer

The burning of natural gas in a stove

Question 7

A 15.0-gram lead ball at $$25.0^\circ\mathrm{C}$$ was heated with $$40.5$$ joules of heat. Given the specific heat of lead is $$0.128\ \mathrm{J}/\mathrm{g}^\circ\mathrm{C}$$, what is the final temperature of the lead?

Accepted Answer

$$27.1$$

Question 8

Which of the following statements about light is FALSE?

Accepted Answer

Light travels much more slowly than sound.

Question 9

Which of the following statements about matter is FALSE?

Accepted Answer

Matter can be created or destroyed in chemical reactions.

Question 10

Which of the following is the correct electron configuration for krypton ($$\mathrm{Kr}$$)?

Accepted Answer

$$1s^22s^22$p^63s^23$p^64s^23$d^{10}4p^6$

Question 11

Which of the following best describes a homogeneous mixture?

Accepted Answer

Gasoline

Question 12

Which of the following is the correct order of the electromagnetic spectrum from shortest wavelength to longest?

Accepted Answer

Gamma Rays $$\rightarrow X-$$rays $$\rightarrow$$ Ultraviolet Radiation $$\rightarrow$$ Visible Light $$\rightarrow$$ Infrared $$\rightarrow$$ Microwaves $$\rightarrow$$ Radio Waves

Question 13

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

Accepted Answer

$$8.09\ \mathrm{mi/hr}$$

Question 14

Which of the following statements about the Bohr Model does NOT hold true?

Accepted Answer

The energy emitted from a relaxing electron can have any wavelength.

Question 15

Which of the following is a property of metals?

Accepted Answer

They are good conductors of heat and electricity.

Question 16

Which of the following is the correct scientific notation for the number $$0.00521$$?

Accepted Answer

$$5.021 	imes 10$$^{-3}$$

Question 17

A sample of a substance is heated from $$25.0^\circ\mathrm{C} to$$ $$75.0^\circ\mathrm{C}$$, absorbing $$500.0 J of $$heat in the process. If the mass of the sample is $$10.0 g$$, what is the specific heat capacity of the substance?

Accepted Answer

$$1.0\ \mathrm{J}/\mathrm{g}^\circ\mathrm{C}$$

Question 18

Which of the following is a correct statement about energy?

Accepted Answer

Energy can neither be created nor destroyed.

Question 19

Which of the following is the correct prefix for the multiplier $$0.001$$?

Accepted Answer

Milli-

Introduction to Chemistry: Key Concepts, Atomic Structure, and Measurement

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