Q: A compound contains 2 moles of Cl, 2 moles of F, and 1 mole of C per mole of compound. What is the mass fraction of Cl if the atomic masses are: C = 12.01, Cl = 35.45, F = 19.00?

$\frac{2 \times 35.45}{12.01 + 2 \times 35.45 + 2 \times 19.00}$

Question 1

Which of the following statements best describes the difference between ionic and covalent bonds?

Accepted Answer

Ionic bonds involve the transfer of electrons from a metal to a non-metal, resulting in oppositely charged ions, while covalent bonds involve the sharing of electrons between two non-metals.

Question 2

Which of the following compounds is an example of a molecular compound?

Accepted Answer

CO2

Question 3

What is the empirical formula for hydrogen peroxide, given its molecular formula is $H_2O_2$?

Accepted Answer

$HO$

Question 4

Which of the following is the correct name for the compound $FeSO_4$?

Accepted Answer

Iron(II) Sulfate

Question 5

A sample contains 82.05 g of $Ca(NO_3)_2$. How many moles of $Ca(NO_3)_2$ are present? (Molar mass = 164.10 g/mol)

Accepted Answer

$0.50$ moles

Question 6

Which of the following is the correct formula for barium phosphate?

Accepted Answer

$Ba_3(PO_4)_2$

Question 7

What is the correct name for $NaClO$?

Accepted Answer

Sodium Hypochlorite

Question 8

Which of the following is the correct name for $CuSO_4 ullet 5H_2O$?

Accepted Answer

Copper(II) Sulfate Pentahydrate

Question 9

Which of the following is the correct formula for dinitrogen monoxide?

Accepted Answer

$N_2O$

Question 10

What is the correct name for $H_2SO_3(aq)$?

Accepted Answer

Sulfurous acid

Question 11

Which of the following is the correct formula for ammonium nitrate?

Accepted Answer

$NH_4NO_3$

Question 12

A compound contains 2 moles of Cl, 2 moles of F, and 1 mole of C per mole of compound. What is the mass fraction of Cl if the atomic masses are: C = 12.01, Cl = 35.45, F = 19.00?

Accepted Answer

$\frac{2 	imes 35.45}{12.01 + 2 	imes 35.45 + 2 	imes 19.00}$

Question 13

Which of the following is the correct name for $Ca(ClO_4)_2$?

Accepted Answer

Calcium Perchlorate

Question 14

What is the correct name for $HBr(aq)$?

Accepted Answer

Hydrobromic acid

Question 15

Which of the following is the correct formula for 4-ethyl-2,7-dimethyloctane?

Accepted Answer

A branched alkane with 8 carbons in the main chain, ethyl group on carbon 4, methyl groups on carbons 2 and 7

Question 16

Which of the following is the correct name for $C_2H_2$?

Accepted Answer

Ethyne

Question 17

A hydrocarbon with the formula $C_6H_6$ and alternating single and double bonds is best described as:

Accepted Answer

Benzene

Question 18

Which of the following functional groups is present in acetic acid?

Accepted Answer

Carboxylic acid

Question 19

A combustion analysis of a hydrocarbon produces 4.4 g of $CO_2$ and 1.8 g of $H_2O$. What is the ratio of moles of C to H in the original sample? (Molar masses: $CO_2 = 44.0$ g/mol, $H_2O = 18.0$ g/mol)

Accepted Answer

$0.10$ mol C : $0.20$ mol H

Question 20

Which of the following is the correct formula for pent-2-ene?

Accepted Answer

$C_5H_{10}$

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