Question 1

Which of the following correctly represents the symbol and name for the ion that has 7 protons and 10 electrons?

Accepted Answer

$$\mathrm{N$$^{3-}$$}$$, Nitride ion

Question 2

What is the correct formula for the ionic compound formed when lithium and nitrogen react?

Accepted Answer

$$\mathrm{Li_3N}$$

Question 3

Which of the following is the correct name for the compound $$\mathrm{Mg_3N_2}$$?

Accepted Answer

Magnesium Nitride

Question 4

Copper(I) oxide is used in antifouling paint. What is its chemical formula?

Accepted Answer

$$\mathrm{Cu_2O}$$

Question 5

Which of the following is the correct name for $$\mathrm{$$KClO_3$$}$$?

Accepted Answer

Potassium Chlorate

Question 6

What is the correct Lewis structure for $$\mathrm{Cl_2O}$$?

Accepted Answer

O is the central atom, single bonds to each Cl, with two lone pairs on O and three lone pairs on each Cl

Question 7

Classify the bond in NaCl using electronegativity values and indicate the direction of the dipole.

Accepted Answer

Ionic; $$\delta^+ on Na$$, $$\delta^- on Cl$$, arrow points from Na to Cl

Question 8

Which of the following best describes the shape of $$\mathrm{$$SiCl_4$$}$$ according to VSEPR theory?

Accepted Answer

Tetrahedral

Question 9

A jewelry design requires 0.750 mole of silver. How many grams of silver are needed? ($$\mathrm{Ag}$$ atomic mass = 107.9 g/mol)

Accepted Answer

$$80.9\ \mathrm{g}$$

Question 10

How many atoms of chlorine are present in the balanced equation: $$\mathrm{Fe_2S_3(s) + 6HCl(aq) \rightarrow 2FeCl_3(aq) + 3H_2S(g)}$$?

Accepted Answer

12

Question 11

Balance the following equation: $$\mathrm{Na_3PO_4(aq) + $$MgCl_2$$(aq) \rightarrow Mg_3$(PO_4$)_2(s) + NaCl(aq)}$$

Accepted Answer

$$2\mathrm{Na_3PO_4} + 3\mathrm{$$MgCl_2$$} \rightarrow 1\mathrm{Mg_3$(PO_4$)_2} + 6\mathrm{NaCl}$$

Question 12

In the reaction $$2\mathrm{Fe}(s) + 3\mathrm{S}(s) \rightarrow \mathrm{Fe_2S_3}(s)$$, how many moles of sulfur are needed to react with 1.42 moles of iron?

Accepted Answer

$$2.13$$ moles

Question 13

How many grams of $$\mathrm{CO_2$}$$ are produced when 54.6 g of $$\mathrm{C_2H_2} is $$burned according to the equation: $$2\mathrm{C_2H_2} + 5\mathrm{O_2$} \rightarrow 4\mathrm{CO_2$} + 2\mathrm{H_2O}$$? (Molar mass $$\mathrm{C_2H_2} = 26.0 g/$$mol, $$\mathrm{CO_2$} = 44.0 g/$$mol)

Accepted Answer

$$184 g$$

Question 14

A hospital oxygen tank has a pressure of 4820 mmHg. What is the pressure in atmospheres? ($$1\ \mathrm{atm} = 760\ \mathrm{mmHg})$$

Accepted Answer

$$6.34\ \mathrm{atm}$$

Question 15

A 12-L tank of compressed oxygen reads 3800 mmHg. How many liters would this same gas occupy at a final pressure of 570 mmHg if temperature and amount of gas do not change?

Accepted Answer

$$80 L$$

Question 16

An oxygen tank has a pressure of 120 atm at 25°C. If a fire causes the temperature to reach 402°C, what is the new pressure (in atm) if the volume and amount of gas do not change? (Assume ideal gas behavior.)

Accepted Answer

$$280$$ atm

Question 17

A heliox breathing mixture for a COPD patient has a total pressure of 7.00 atm. If the partial pressure of oxygen is 1140 mmHg, what is the partial pressure of helium in atm? ($$1\ \mathrm{atm} = 760\ \mathrm{mmHg})$$

Accepted Answer

$$5.5$$ atm

GOB Chemistry: Ionic Compounds, Bonding, Chemical Equations, and Gases – Study Guide

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