Q: How many atoms are in 0.305 moles of carbon?

$$1.83 \times 10$$^{23}$$ atoms

Q: The distance from Miami to Tampa is $$280.9 mi. $$What is the distance in micrometers? ($$1 \ \text{mi} = 1.609 \times 10^3$ \ \text{m})$$

$$4.520 \times 10$$^{11}$$ \ \mu\text{m}$$

Q: A football field is $$100$$ yards. How many nanometers would $$3$$ football fields have? ($$1 \ \text{yd} = 0.9144 \ \text{m})$$

$$2.74 \times 10$$^{11}$$ \ \text{nm}$$

Q: How many molecules are in $$0.275$$ moles of $$\text{CO}_2$$?

$$1.65 \times 10$$^{23}$$ molecules

Question 1

A European automobile has a gas mileage of 20.0 km/L. What is the gas mileage in miles per gallon? (1 mile = 1.609 km, 1 gal = 3.785 L)

Accepted Answer

$$47.2 \ 	ext{mi/gal}$$

Question 2

Which of the following statements is/are correct?

(i) If germanium has a mass number of 72, it has 32 neutrons.
(ii) A neutral atom of gold has 79 protons and 79 electrons.
(iii) If magnesium has 13 neutrons, it has a mass number of 25.

Accepted Answer

ii and iii

Question 3

Which of the following statements is/are correct?

(i) CO(g) is a compound
(ii) H$$_2(g) is a $$compound
(iii) Milk is a mixture

Accepted Answer

i and iii

Question 4

How many atoms are in 0.305 moles of carbon?

Accepted Answer

$$1.83 	imes 10$$^{23}$$ atoms

Question 5

Which of the following statements is/are correct?

(i) Carbon and oxygen forming carbon dioxide is a physical change.
(ii) Wood burning is a chemical change.
(iii) Ice melting is a chemical change.

Accepted Answer

ii only

Question 6

If the density of silver is $$10.49 \ 	ext{g/cm}^3$$, what is the volume, in $$	ext{cm}^3$$, if you have $$8.35 \ 	ext{kg} of $$silver?

Accepted Answer

$$796 \ 	ext{cm}^3$$

Question 7

The distance from Miami to Tampa is $$280.9 mi. $$What is the distance in micrometers? ($$1 \ 	ext{mi} = 1.609 	imes 10^3$ \ 	ext{m})$$

Accepted Answer

$$4.520 	imes 10$$^{11}$$ \ \mu	ext{m}$$

Question 8

Naturally occurring isotopes of magnesium (Mg-24, Mg-25, and Mg-26) have the following atomic masses and abundances: Mg-24: $$23.985$$ amu, $$78.99\%$$; Mg-25: $$24.986$$ amu, $$10.00\%$$; Mg-26: $$25.983$$ amu, $$11.01\%. $$What is the atomic mass of magnesium?

Accepted Answer

$$24.31$$ amu

Question 9

A football field is $$100$$ yards. How many nanometers would $$3$$ football fields have? ($$1 \ 	ext{yd} = 0.9144 \ 	ext{m})$$

Accepted Answer

$$2.74 	imes 10$$^{11}$$ \ 	ext{nm}$$

Question 10

What is the answer to the correct number of significant figures?

$$\dfrac{3.11 	imes (7.5 - 3.31)}{2}$$

Accepted Answer

$$6.5$$

Question 11

Which of the following statements is/are correct?

(i) Hydrogen is an alkali metal.
(ii) Iodine is a halogen.
(iii) Calcium is an alkaline earth metal.

Accepted Answer

ii and iii

Question 12

Which of the following statements is correct about the image below? (Image 1: mixture, Image 2: mixture, Image 3: pure substance)

Accepted Answer

a. Image 1 is a mixture
b. Image 2 is a mixture
c. Image 3 is a pure substance

Question 13

Determine the number of protons, neutrons, and electrons in the following isotope: $$^{134}_{56}	ext{Ba}^{2+}$$

Accepted Answer

56 protons, 78 neutrons, 54 electrons

Question 14

A mole of copper will have a greater mass than 2 moles of zinc. Which statement below is correct?

Accepted Answer

A mole of zinc will have a greater mass than a mole of copper.

Question 15

The hand is an ancient unit of length to measure the height of a horse from the ground to its shoulder. What is the height of a horse in meters that is $$15.2$$ hands if $$1$$ hand = $$4$$ inches? ($$1$$ inch = $$2.54 cm)$$

Accepted Answer

$$1.54 m$$

Question 16

How many protons does an atom of gallium have in its nucleus?

Accepted Answer

31

Question 17

If you have $$6.50$$ grams of $$	ext{H}_2	ext{O}$$, how many moles do you have? ($$M_{	ext{H}_2$$	ext{O}} = 18.02$$ g/mol)

Accepted Answer

$$0.361$$ moles

Question 18

Which statement below is correct?

Accepted Answer

A mole of sodium chloride will have a greater mass than 2 moles of oxygen gas.

Question 19

How many molecules are in $$0.275$$ moles of $$	ext{CO}_2$$?

Accepted Answer

$$1.65 	imes 10$$^{23}$$ molecules

Question 20

What is the sum of the coefficients when the following equation is correctly balanced?

$$\_\ 	ext{Fe}(s) + \_\ 	ext{H}_2	ext{O}(l) ightarrow \_\ 	ext{Fe}_3	ext{O}_4(s) + \_\ 	ext{H}_2(g)$$

Accepted Answer

9

Question 21

Which of the following samples will have the greatest mass?

Accepted Answer

5 mol of solid carbon

Question 22

Calculate the number of oxygen atoms contained in $$0.000893 g of $$potassium dichromate, $$	ext{K}_2	ext{Cr}_2	ext{O}_7$$. ($$M_{	ext{K}_2$$	ext{Cr}_2	ext{O}_7} = 294.18$$ g/mol)

Accepted Answer

$$1.28 	imes 10$$^{19}$$

General Chemistry Exam Review: Concepts, Calculations, and Dimensional Analysis

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