Q: Which of the following is a correct electron transfer diagram for the formation of $$ ext{MgO}$$ from magnesium and oxygen?

Magnesium donates two electrons to oxygen, forming $$\text{Mg}^{2+}$$ and $$\text{O}^{2-}$$ ions

Question 1

Which of the following best describes the purpose of a Lewis structure in chemistry?

Accepted Answer

To represent the arrangement of valence electrons and bonds in a molecule

Question 2

According to VSEPR theory, what is the molecular geometry of $$	ext{CO}_2$$?

Accepted Answer

Linear

Question 3

How many sigma ($$\sigma) $$and pi ($$\pi) $$bonds are present in the molecule $$	ext{C}_2	ext{H}_4 ($$ethene)?

Accepted Answer

$$5$$ \sigma$$ bonds and 1$ \pi$$ bond

Question 4

Which hybridization is present in the central atom of $$	ext{NH}_3$$?

Accepted Answer

$$sp^3$$

Question 5

When sodium reacts with chlorine to form sodium chloride, what type of electron transfer diagram would best represent this process?

Accepted Answer

A diagram showing sodium donating an electron to chlorine, forming ions

Question 6

Which of the following is the correct formula for magnesium chloride, an ionic compound?

Accepted Answer

$$	ext{MgCl}_2$$

Question 7

What is the correct name for the covalent compound $$	ext{N}_2	ext{O}_4$$?

Accepted Answer

Dinitrogen tetraoxide

Question 8

Which of the following is the correct formula for sulfuric acid?

Accepted Answer

$$	ext{H}_2	ext{SO}_4$$

Question 9

A solution is prepared by dissolving $$0.5$$ moles of $$	ext{NaCl} in$$ $$2.0$$ liters of water. What is the molarity of the solution?

Accepted Answer

$$0.25$$ 	ext{M}$

Question 10

If $$100 mL of a$$ $$1.0 M$$ $$	ext{HCl}$$ solution is diluted to a final volume of $$500 mL$$, what is the final concentration?

Accepted Answer

$$0.2$$ 	ext{M}$

Question 11

A chemist needs to prepare $$250 mL of a$$ $$0.4 M$$ $$	ext{KNO}_3$$ solution. How many grams of $$	ext{KNO}_3 ($$molar mass $$101 g/$$mol) are required?

Accepted Answer

$$10.1 g$$

Question 12

Which of the following is the correct empirical formula for a compound containing $$40.0	ext{ g} of $$carbon, $$6.7	ext{ g} of $$hydrogen, and $$53.3	ext{ g} of $$oxygen?

Accepted Answer

$$	ext{CH}_2	ext{O}$$

Question 13

Which of the following statements about sigma ($$\sigma) $$and pi ($$\pi) $$bonds is correct?

Accepted Answer

A single bond is always a $$\sigma$$ bond

Question 14

Which of the following molecules has a tetrahedral molecular geometry according to VSEPR theory?

Accepted Answer

$$	ext{CH}_4$$

Question 15

What is the hybridization of the carbon atom in $$	ext{CO}_2$$?

Accepted Answer

$$sp$$

Question 16

Which of the following is a correct electron transfer diagram for the formation of $$	ext{MgO}$$ from magnesium and oxygen?

Accepted Answer

Magnesium donates two electrons to oxygen, forming $$	ext{Mg}^{2+}$$ and $$	ext{O}^{2-}$$ ions

Question 17

A $$500 mL $$solution contains $$0.25$$ moles of $$	ext{Na}_2	ext{SO}_4. $$What is the molarity of the solution?

Accepted Answer

$$0.50$$ 	ext{M}$

Question 18

Which of the following is the correct name for $$	ext{CaCl}_2$$?

Accepted Answer

Calcium chloride

Question 19

A student mixes $$50 mL of$$ $$2.0 M$$ $$	ext{NaOH}$$ with $$150 mL of $$water. What is the final concentration of $$	ext{NaOH}$$?

Accepted Answer

$$0.5$$ 	ext{M}$

Question 20

Which of the following is the correct empirical formula for a compound with $$24.0 g of $$carbon and $$4.0 g of $$hydrogen?

Accepted Answer

$$	ext{CH}_2$$

General Chemistry Study Guide: Molecular Structure, Nomenclature, and Calculations

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