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

$$C_5H_{10}$$

Molecules, Compounds, and Nomenclature: Study Notes

Guida di studio - Domande di pratica

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