AP Chemistry Chapters 1-4 and 21 Quiz

Questions and Answers

The average atomic mass of the element is ________ amu.

220.67

________ is the abbreviation for the prefix milli-.

m (correct)

What is the empirical formula of the compound that produced 2.265 g of CO2 and 1.236 g of H2O from a 1.031-g sample?

C3H8O (correct)

C3H6O3

C3H9O3

C3H5O

What is the % yield of SO3 in the reaction of 5.0 grams of O2 with 6.0 grams of S producing 7.9 grams of SO3?

93 Signup and view all the answers

When the following equation is balanced, the coefficient of H2O is ________. Ca (s) + H2O (l) → Ca(OH)2 (aq) + H2 (g)

2 Signup and view all the answers

What is the maximum amount in grams of SO3 that can be produced by the reaction of 1.0 g of S with 1.0 g of O2?

1.7 Signup and view all the answers

A solid material contains 53.66 percent of oxalic acid (H2C2O4) by mass, requiring ________ mL of 0.3483 M NaOH for neutralization.

22.39 Signup and view all the answers

How many oxygen atoms are there in 52.06 g of carbon dioxide?

1.424 × 10^24 Signup and view all the answers

Which of the following are combustion reactions?

1 and 4 Signup and view all the answers

The combustion of 43.9 g of ammonia produces ________ g of NO2.

119 Signup and view all the answers

How many neutrons are there in one atom of 182W?

108 Signup and view all the answers

A wooden object has a mass of 10.782 g and occupies a volume of 13.72 mL. What is the density of the object?

7.859 × 10^-1 g/mL Signup and view all the answers

The concentration (M) of the acid titrated with NaOH was ________.

0.0102 Signup and view all the answers

The maximum amount of Al2O3 produced from 2.5 g of Al and 2.5 g of O2 is ________ g.

4.7 Signup and view all the answers

Production of 13 g of C2H2 requires ________ g of H2O.

18 Signup and view all the answers

Aluminum forms an ion with a charge of ________.

3+ Signup and view all the answers

The concentration (M) of the acid was ________ when 51.2 mL of NaOH were used.

0.227 Signup and view all the answers

What is the formula of the compound formed between strontium ions and nitrogen ions?

Sr3N2 Signup and view all the answers

How many protons does the Ca2+ ion possess?

20 Signup and view all the answers

An atom of 14C contains ________ protons.

6 Signup and view all the answers

The total concentration of ions in a 0.625 M solution of HCl is ________.

1.25 M Signup and view all the answers

Which one of the following is not one of the postulates of Dalton's atomic theory?

Atoms are composed of protons, neutrons, and electrons. Signup and view all the answers

Which formula/name pair is incorrect? Mg3N2 ________

magnesium nitrite Signup and view all the answers

The formula weight of potassium dichromate (K2Cr2O7) is ________ amu.

294.18 Signup and view all the answers

Elements in the same group of the periodic table typically have ________.

similar physical and chemical properties Signup and view all the answers

The empirical formula of a compound with molecules containing 12 carbon atoms, 14 hydrogen atoms, and 6 oxygen atoms is ________.

C6H7O3 Signup and view all the answers

Which combination of protons, neutrons, and electrons is correct for the isotope of copper, 63Cu?

29 p+, 34 n°, 29 e- Signup and view all the answers

Elements in Group 1A are known as the ________.

alkali metals Signup and view all the answers

What is the molarity of chloride ion in the final solution after adding NaCl to CaCl2?

0.816 Signup and view all the answers

In which reaction does the oxidation number of oxygen increase?

2H2O (l) → 2H2 (g) + O2 (g) Signup and view all the answers

The mass % of F in the binary compound KrF2 is ________.

31.20 Signup and view all the answers

The mass of 1.00 mol of allicin, rounded to the nearest integer, is ________ g.

162 Signup and view all the answers

In the periodic table, the elements touching the steplike line are known as ________.

metalloids Signup and view all the answers

Elements in Group 8A are known as the ________.

noble gases Signup and view all the answers

Fluorine forms an ion with a charge of ________.

1- Signup and view all the answers

What is the concentration (M) of a NaCl solution prepared by dissolving 9.1 g of NaCl in sufficient water to give 375 mL of solution?

0.42 Signup and view all the answers

and reside in the atomic nucleus.

protons, neutrons Signup and view all the answers

Which one of the following is a correct expression for molarity?

mmol solute/mL solution Signup and view all the answers

Vertical columns of the periodic table are known as ________.

groups Signup and view all the answers

When 3.50 g of magnesium burns, the theoretical yield of magnesium oxide is ________ g.

5.80 Signup and view all the answers

The atomic number indicates ________.

the number of protons or electrons in a neutral atom Signup and view all the answers

There are ________ sulfur atoms in 25 molecules of C4H4S2.

50 Signup and view all the answers

What are the spectator ions in the reaction between KOH (aq) and HNO3 (aq)?

H+ and NO3- Signup and view all the answers

There are ________ mol of bromide ions in 0.600 L of a 0.350 M solution of AlBr3.

0.630 Signup and view all the answers

When the following equation is balanced, the coefficient of sulfur dioxide is ________. PbS (s) + O2 (g) → PbO (s) + SO2 (g)

2 Signup and view all the answers

How many moles of Co2+ are present in 0.350 L of a 0.150 M solution of CoI2?

5.25 × 10^{-2} Signup and view all the answers

How many milliliters of a stock solution of 14.2 M HNO3 would be needed to prepare 0.500 L of 0.500 M HNO3?

17.6 Signup and view all the answers

When the following equation is balanced, the coefficient of hydrogen is ________. K (s) + H2O (l) → KOH (aq) + H2 (g)

1 Signup and view all the answers

Which one of the following is a weak acid?

HF Signup and view all the answers

This reaction is an example of ____. 8536Kr → 8537Rb + _

beta decay Signup and view all the answers

The combustion of propane (C3H8) in the presence of excess oxygen yields CO2 and H2O. When 7.3 g of C3H8 burns, ________ g of CO2 is produced.

22 Signup and view all the answers

Sulfur and fluorine react in a combination reaction to produce sulfur hexafluoride. If the percent yield is 79.0% from a 7.90-g sample, it yields ________ g of SF6.

7.99 Signup and view all the answers

The number 0.01120 has ________ significant figures.

4 Signup and view all the answers

The maximum amount of SF6 that can be produced from the reaction of 3.5 g of sulfur with 4.5 g of fluorine is ________ g.

5.8 Signup and view all the answers

Which one of the following compounds is chromium(III) oxide?

Cr2O3 Signup and view all the answers

The charge on an electron was determined in the ________.

Millikan oil drop experiment Signup and view all the answers

The atomic number of an atom of 131I is ________.

53 Signup and view all the answers

The correct name for SO is ________.

sulfur monoxide Signup and view all the answers

Based on the equations below, which metal is the most active?

Ni Signup and view all the answers

Barium forms an ion with a charge of ________.

2+ Signup and view all the answers

Study Notes

Isotopes and Atomic Mass

Average atomic mass is calculated based on isotopes' masses and their percentages.
Given isotopes of element X:
- 221X: 82.900% abundance, mass 220.90 amu
- 220X: 13.200% abundance, mass 220.00 amu
- 218X: 3.9000% abundance, mass 218.10 amu
Average atomic mass = 220.67 amu.

Chemical Prefixes

The prefix milli- is abbreviated as "m".

Empirical Formulas

Combustion of a compound yielding 2.265 g CO2 and 1.236 g H2O from a 1.031 g sample reveals empirical formula as C3H8O.

Percent Yield

In a sulfur and oxygen reaction, producing 7.9 g of SO3 from 5.0 g O2 and 6.0 g S results in a percent yield of 93%.

Balancing Reactions

When balancing the equation for calcium and water, the coefficient of H2O is 2.

Reaction Theoretical Yields

Reaction of 1.0 g S and 1.0 g O2 can theoretically produce a maximum of 1.7 g SO3.

Neutralization Reactions

A 0.6543 g sample containing 53.66% oxalic acid requires 22.39 mL of 0.3483 M NaOH for neutralization.

Mole Calculations

52.06 g of CO2 contains approximately 1.424 × 10^24 oxygen atoms.
The combustion of ammonia produces 119 g of NO2 from the combustion of 43.9 g of ammonia.

Neutron Counting

182W contains 108 neutrons.

Density Calculations

Density of a wooden object with mass 10.782 g and volume 13.72 mL is 7.859 × 10^-1 g/mL.

Acid Titration

Unknown concentration of HNO3 titrated with NaOH gives concentration of 0.0102 M.

Chemical Compounds

Aluminum reacts with oxygen to produce a maximum of 4.7 g Al2O3 from 2.5 g of each reactant.
Production of 13 g of C2H2 from calcium carbide requires 18 g of H2O.
Calcium ion charges are 3+.

Ionic Relationships

Ca2+ ion has 20 protons.
14C atom contains 6 protons.

Ion Concentration

Total ion concentration in 0.625 M HCl solution is 1.25 M.

Dalton’s Atomic Theory

Atoms are composed of protons and neutrons, incorrect postulate was atoms consist of these particles.

Errors in Compound Naming

Incorrect pairing includes Mg3N2 as magnesium nitrite.

Molecular Weights

Formula weight of potassium dichromate (K2Cr2O7) is 294.18 amu.
Mass % of F in KrF2 is 31.20%.

Group Properties in the Periodic Table

Elements in the same group have similar physical and chemical properties.
Group 1A elements are alkali metals, Group 8A elements are noble gases.

Molarity

Molarity of chloride ions in a solution containing NaCl and CaCl2 is 0.816.
Correct expression for molarity: mol solute/L solution.

Significant Figures

Number 0.01120 has 4 significant figures.

Active Metals and Reactions

Copper isotope with 29 protons and 34 neutrons: 29 p+, 34 n°.
Most active metal in reactions is Ni.

Radioactive Decay Types

Given decay of 8536Kr to 8537Rb is an example of beta decay.

Notebook Summary

Understanding isotopes, stoichiometry, empirical formulas, acid-base reactions, and the periodic table's structure is fundamental in mastering AP Chemistry concepts.
Always focus on units, significant figures, balanced equations, and identifying correct formulas or names in compounds.

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Description

Test your knowledge with this practice quiz covering Chapters 1-4 and 21 of AP Chemistry. Engage with flashcards that challenge your understanding of isotopes, atomic masses, and common prefixes in chemistry. Perfect for exam preparation and review.