Q: How many atoms are in $$0.68$$ moles of zinc?

$$4.09 \times 10$$^{23}$$ atoms

Question 1

Which of the following best describes an alloy?

Accepted Answer

A homogeneous mixture of metals

Question 2

A sample of lead (Pb) has a mass of 22.7 g and a volume of 2.0 cm$$^3. $$What is the density of the sample?

Accepted Answer

$$11.35\ \mathrm{g/cm^3$}$$

Question 3

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

Accepted Answer

Reactivity with water

Question 4

Which statement correctly distinguishes between a compound and a mixture?

Accepted Answer

A compound has properties different from its constituent elements, while a mixture retains the properties of its components.

Question 5

How many atoms are in $$0.68$$ moles of zinc?

Accepted Answer

$$4.09 	imes 10$$^{23}$$ atoms

Question 6

Which of the following is an example of an extensive property?

Accepted Answer

Mass

Question 7

A 119.5 g solid cylinder has a radius of $$1.8\ \mathrm{cm}$$ and a height of $$1.5\ \mathrm{cm}. $$What is its density? (Use $$V = \pi r^2$ h)$$

Accepted Answer

$$7.85\ \mathrm{g/cm^3$}$$

Question 8

Which process is best for separating a mixture of sand and iron filings?

Accepted Answer

Using a magnet

Question 9

Which of the following is a diatomic element in its natural state?

Accepted Answer

O$$_2$$

Question 10

A 153 g rectangular solid has edge lengths $$8.2\ \mathrm{cm}$$, $$5.1\ \mathrm{cm}$$, and $$4.7\ \mathrm{cm}. $$Will this object sink in water? (Density of water = $$1.00\ \mathrm{g/cm^3$})$$

Accepted Answer

Yes, because its density is greater than $$1.00\ \mathrm{g/cm^3$}$$

Question 11

Which of the following changes is exothermic?

Accepted Answer

Water freezing

Question 12

Which statement about the Law of Conservation of Energy is correct?

Accepted Answer

Energy cannot be created or destroyed, only transformed from one form to another.

Question 13

How many moles are in $$3.79 	imes 10$$^{23}$$ atoms of zinc?

Accepted Answer

$$0.63$$ moles

Question 14

Which of the following is a homogeneous mixture?

Accepted Answer

Salt water

Question 15

Which of the following is an allotrope of carbon?

Accepted Answer

Diamond

Question 16

A 550 g sample of chromium(III) oxide (Cr$$_2O$_3) $$has 376 g of Cr. How many grams of Cr are in a 212 g sample of Cr$$_2O$_3$$?

Accepted Answer

$$145 g$$

Question 17

Which of the following is a physical change?

Accepted Answer

Ice melting

Question 18

Which method would best separate a solution of salt dissolved in water?

Accepted Answer

Distillation

Question 19

Which of the following is a polyatomic element?

Accepted Answer

P$$_4$$

Question 20

Which of the following best describes a heterogeneous mixture?

Accepted Answer

A mixture with different composition and properties in the same sample

Fundamental Concepts in General Chemistry: Matter, Classification, Properties, and the Mole

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