Q: How many atoms are present in 1.92 mL of mercury? (Density of mercury is 13.5 g/mL, atomic mass = 200.59 g/mol, Avogadro's number = $$6.022 \times 10$$^{23}$$ atoms/mol)

$$7.78 \times 10$$^{22}$$ atoms

Question 1

Which of the following is a chemical property of rubbing alcohol?

Accepted Answer

Flammability

Question 2

Perform the calculation $$\frac{43.900 	imes 0.00550}{2.002}$$ and report the answer with the correct number of significant figures.

Accepted Answer

$$0.121$$

Question 3

Which conclusion was drawn from Rutherford’s gold foil experiment?

Accepted Answer

Atoms are mostly empty space.

Question 4

How many atoms are present in 1.92 mL of mercury? (Density of mercury is 13.5 g/mL, atomic mass = 200.59 g/mol, Avogadro's number = $$6.022 	imes 10$$^{23}$$ atoms/mol)

Accepted Answer

$$7.78 	imes 10$$^{22}$$ atoms

Question 5

What is the correct name for the compound $$\mathrm{P_2I_4}$$?

Accepted Answer

Diphosphorus tetraiodide

Question 6

Given the empirical formula $$\mathrm{C_4H_9}$$ and a molar mass of 114.22 g/mol, what is the molecular formula?

Accepted Answer

$$\mathrm{C_4H_9}$$

Question 7

Balance the following reaction: $$\mathrm{$$PCl_3$$(l) + H_2O(l) \rightarrow H_3PO_4(aq) + HCl(aq)}$$

Accepted Answer

$$\mathrm{$$PCl_3$$ + 3H_2O \rightarrow H_3PO_4 + 3HCl}$$

Question 8

Solid potassium chlorate ($$\mathrm{$$KClO_3$$}) $$decomposes into potassium chloride and oxygen when heated. How many moles of oxygen gas are produced from 50.8 g of potassium chlorate? ($$\mathrm{2KClO_3 \rightarrow 2KCl + 3O_2}$$, molar mass $$\mathrm{$$KClO_3$$} = 122.55 g/$$mol)

Accepted Answer

0.621 mol $$\mathrm{$$KClO_3$$}$$ produces 0.414 mol $$\mathrm{O_2$}$$

Question 9

What volume of a 1.53 M HCl solution is needed to prepare 3.00 L of a 0.100 M HCl solution?

Accepted Answer

0.196 L

Question 10

What is the net ionic equation for the reaction between aqueous KHCO$$_3$$ and HBr?

Accepted Answer

$$\mathrm{$$HCO_3$$^- (aq) + H^+ (aq) \rightarrow CO_2$ (g) + H_2O (l)}$$

Question 11

A potassium bromide solution is 3.55% KBr by mass and has a density of 1.03 g/mL. What mass of KBr is present in 35.8 mL of this solution?

Accepted Answer

1.31 g

Question 12

A water sample contains chlorobenzene at 15 ppb (by mass). What volume of this water contains $$5.00 	imes 10^2$ mg of chlorobenzene? (Assume density = 1.00 g/mL)

Accepted Answer

$$3.33 	imes 10^4$ L

Question 13

Which of the following best describes an isotope?

Accepted Answer

Atoms with the same number of protons but different numbers of neutrons

Question 14

Which element has the highest electronegativity according to the periodic table?

Accepted Answer

Fluorine

Question 15

Which of the following compounds is an acid?

Accepted Answer

$$\mathrm{$$HNO_2$$}$$

Question 16

Which of the following is a physical property?

Accepted Answer

Boiling point

Question 17

Which of the following best describes the law of conservation of mass?

Accepted Answer

Mass is neither created nor destroyed in a chemical reaction

Question 18

Which of the following is the correct molecular formula for a compound with empirical formula $$\mathrm{CCl}$$ and molar mass 284.77 g/mol? (Molar mass of $$\mathrm{CCl} = 49.46 g/$$mol)

Accepted Answer

$$\mathrm{C_6Cl_6}$$

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