Question 1

Which statement best explains why ionic compounds are electrically neutral overall?

Accepted Answer

Because cations and anions always occur together in compounds so that the overall charge is zero.

Question 2

A sample of silver contains two isotopes: Ag-107 (atomic mass = 106.90509 amu, abundance = 51.84%) and Ag-109 (atomic mass = 108.90476 amu, abundance = 48.16%). What is the average atomic mass of silver?

Accepted Answer

$108.19$ amu

Question 3

Which of the following is a correct balanced equation for the reaction of aqueous aluminum acetate with aqueous ammonium phosphate to form solid aluminum phosphate and aqueous ammonium acetate?

Accepted Answer

$Al(C_2H_3O_2)_3(aq) + (NH_4)_3PO_4(aq) \rightarrow AlPO_4(s) + 3 NH_4C_2H_3O_2(aq)$

Question 4

A piece of metal weighs $45.42$ g. When the metal is placed in a graduated cylinder containing water, the liquid level rises from $26.30$ mL to $31.38$ mL. What is the density of the metal?

Accepted Answer

$8.94$ g/cm$^3$

Question 5

Which of the following statements about subatomic particles is true?

Accepted Answer

A neutral atom contains the same number of protons and electrons.

Question 6

What is the empirical formula of a hydrocarbon that yields $2.20$ g CO$_2$ and $1.08$ g H$_2$O upon combustion? (Molar mass of hydrocarbon is $72.18$ g/mol)

Accepted Answer

$CH_2$

Question 7

Which of the following pairs are isotopes of the same element?

Accepted Answer

$^{12}C$ and $^{13}C$

Question 8

Calculate the percent composition of lithium in Li$_3$PO$_4$ (molar mass Li$_3$PO$_4$ = $115.79$ g/mol).

Accepted Answer

$17.98\%$

Question 9

Which of the following is a molecular element?

Accepted Answer

$N_2$

Question 10

A student measures the mass of tin to be $0.5$ mol. Which of the following has the greatest mass?

Accepted Answer

$0.5$ mol tin

Question 11

Which of the following compounds contains both ionic and covalent bonds?

Accepted Answer

$KNO_3$

Question 12

What is the molar mass of Ca$_3$(PO$_4$)$_2$?

Accepted Answer

$310.17$ g/mol

Question 13

Which of the following statements is true about ductility?

Accepted Answer

Ductility is a term that means 'ability to be drawn into a thin wire'.

Question 14

Which of the following is the highest temperature?

Accepted Answer

$274\ ^\circ C$

Question 15

How many oxygen atoms are contained in $47.6$ g of Al$_2$(CO$_3$)$_3$? (molar mass Al$_2$(CO$_3$)$_3$ = $233.99$ g/mol)

Accepted Answer

$1.10 	imes 10^{24}$ atoms

Question 16

Which of the following is a heterogeneous mixture that can scatter light as a colloid?

Accepted Answer

Milk

Question 17

Which of the following name-formula pairs are incorrect?

Accepted Answer

C, D, and E only

Question 18

What is the empirical formula for glucose, C$_6$H$_{12}$O$_6$?

Accepted Answer

$CH_2O$

Question 19

Which of the following elements will most likely form ionic cations in compounds?

Accepted Answer

Calcium

Question 20

A reaction yields $5.00$ g of calcium hydroxide when $12.0$ g of calcium metal is reacted with water. Calculate the percent yield for the reaction. (Balanced equation: $Ca + 2H_2O \rightarrow Ca(OH)_2 + H_2$)

Accepted Answer

$22.5\%$

General Chemistry Exam Study Guide: Key Concepts, Equations, and Problem-Solving Strategies

Study Guide - Practice Questions

Study Guide - Flashcards