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$

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