Q: How many carbon atoms can be found in 3.85 mol of carbon?

$$2.32 \times 10$$^{24}$$ carbon atoms

Q: How many carbon atoms are there in 77.28 g of ethane (C2H6)?

$$1.548 \times 10$$^{24}$$ carbon atoms

Question 1

Which of the following compounds is classified as covalent?

Accepted Answer

HCl

Question 2

Which of the following compounds is NOT classified as covalent?

Accepted Answer

MgCl2

Question 3

How many covalent bonds are generally formed by atoms with five valence electrons?

Accepted Answer

3

Question 4

Which of the following molecule(s) is/are polar?

Accepted Answer

CH3Br

Question 5

Rank the atoms Br, Cl, and F in order of increasing electronegativity.

Accepted Answer

Br \u003c Cl \u003c F

Question 6

Which of the following Lewis structures correctly represents dichloromethane (CH2Cl2)?

Accepted Answer

A structure with two H atoms and two Cl atoms bonded to a central C atom

Question 7

In redox reactions, metals tend to undergo oxidation.

Accepted Answer

true

Question 8

Which chemical equation of the following reaction is properly balanced? $$\mathrm{SO_3$ + O_2$ + H_2O \rightarrow H_2SO_4}$$

Accepted Answer

$$\mathrm{2SO_3 + O_2$ + 2H_2O \rightarrow 2H_2SO_4}$$

Question 9

How many carbon atoms can be found in 3.85 mol of carbon?

Accepted Answer

$$2.32 	imes 10$$^{24}$$ carbon atoms

Question 10

How many moles of chloroethylene (C2H3Cl) contain $$5.47 	imes 10$$^{24}$$ molecules?

Accepted Answer

9.09 mol of C2H3Cl

Question 11

What is the mass of 0.112 mol of carbon?

Accepted Answer

1.34 g

Question 12

Potassium metal (K) reacts violently with water according to the following balanced equation: $$2K(s) + 2H_2O(l) \rightarrow 2KOH(aq) + H_2$(g). $$How many moles of H2O are needed to react completely with 7.54 mol of K?

Accepted Answer

7.54 mol of H2O

Question 13

What are the two half reactions that show how many electrons are gained or lost by each species in the reaction: $$\mathrm{Ni$$^{2+}$$(aq) + Mg(s) \rightarrow Ni(s) + Mg$$^{2+}$$(aq)}$$?

Accepted Answer

$$\mathrm{Ni$$^{2+}$$(aq) + 2e^- \rightarrow Ni(s)}$$ and $$\mathrm{Mg(s) \rightarrow Mg$$^{2+}$$(aq) + 2e^-}$$

Question 14

How many carbon atoms are there in 77.28 g of ethane (C2H6)?

Accepted Answer

$$1.548 	imes 10$$^{24}$$ carbon atoms

Question 15

How many moles of carbon dioxide are in 211 g of carbon dioxide?

Accepted Answer

4.79 mol of CO2

Question 16

When calculating the number of moles of calcium hydroxide formed from each mole of sodium hydroxide in the balanced reaction: $$\mathrm{$$CaCl_2$$ + 2NaOH \rightarrow Ca(OH)_2 + 2NaCl}$$, the necessary conversion factor (molar ratio) is:

Accepted Answer

1 mol Ca(OH)2 / 2 mol NaOH

Question 17

A compound that gains electrons in a redox reaction while causing another compound to be oxidized is called a(n) ______ agent.

Accepted Answer

oxidizing

Fundamental Chemistry Concepts for Anatomy & Physiology Students: Covalent Bonds, Polarity, Redox, and Stoichiometry

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