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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