Question 1

Which of the following best describes a scientific law?

Accepted Answer

A brief statement that summarizes many past observations and predicts new ones.

Question 2

A student burns a 5.0 g sample of magnesium in air and collects 8.3 g of white ash. According to the law of conservation of mass, what happened to the increase in mass?

Accepted Answer

The magnesium absorbed oxygen from the air, increasing the total mass.

Question 3

Which of the following measurements has the greatest number of significant figures?

Accepted Answer

$$0.03010$$

Question 4

A sample of a metal has a mass of $$0.0072$$ grams. What is this mass in milligrams?

Accepted Answer

$$7.2$$ \ \mathrm{mg}$

Question 5

A block of metal has dimensions $$2.0 \ \mathrm{cm} 	imes 4.0 \ \mathrm{cm} 	imes 1.5 \ \mathrm{cm}$$ and a mass of $$18.0$$ grams. Will the block float in water? (Density of water is $$1.0 \ \mathrm{g/mL})$$

Accepted Answer

No, because the density of the block is $$1.5 \ \mathrm{g/mL}$$ which is greater than water.

Question 6

A lead ball has a mass of $$68.4$$ grams and a density of $$11.4 \ \mathrm{g/cm^3$}. $$What is the volume of the ball?

Accepted Answer

$$6.00$$ \ \mathrm{mL}$

Question 7

A candle burns at a rate of $$45.0$$ milligrams per minute. What is this rate in grams per hour?

Accepted Answer

$$2.70$$ \ \mathrm{g/hr}$

Question 8

Which of the following statements about ions is INCORRECT?

Accepted Answer

Cations always have the same number of protons as electrons.

Question 9

A fictional element, X, has three naturally occurring isotopes: $$X$$-$$10 (20$$%), $$X$$-$$11 (50$$%), and $$X$$-$$12 (30$$%). What is the atomic mass of element X?

Accepted Answer

$$11.1$$ \ \mathrm{amu}$

Question 10

Which of the following elements is a halogen?

Accepted Answer

I

Question 11

Which of the following atoms has the greatest metallic character?

Accepted Answer

Cs

Question 12

Which of the following atoms is the largest?

Accepted Answer

Cs

Question 13

Which of the following elements has the lowest ionization energy?

Accepted Answer

Rb

Question 14

A photon of light has a frequency of $$6.00 	imes 10$$^{14}$$ \ \mathrm{Hz}. $$What is its wavelength in nanometers? (Speed of light $$c = 3.00 	imes 10^8$ \ \mathrm{m/s})$$

Accepted Answer

$$500$$ \ \mathrm{nm}$

Question 15

Which of the following sublevels contains the greatest number of orbitals?

Accepted Answer

f

Question 16

Which rule states that electrons fill orbitals singly first with parallel spins before pairing up?

Accepted Answer

Hund's rule

Question 17

Which of the following ions has the same number of electrons as a neutral neon atom?

Accepted Answer

K+

Question 18

A stream flows at a rate of $$12.0$$ liters per hour. Convert this rate to cubic meters per day. ($$1 \ \mathrm{m^3$} = 1000 \ \mathrm{L})$$

Accepted Answer

$$0.288 \ \mathrm{m^3$/day}$$

Question 19

Which of the following is the correct electron configuration for gallium (Ga)?

Accepted Answer

$$1s^2$$ $$2s^2$$ $$2p^6$$ $$3s^2$$ $$3p^6$$ $$4s^2$$ $$3d^{10}$$ $$4p^1$$

Introduction to Chemistry Exam 1 Review – Step-by-Step Study Guidance

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