Chemistry Exam

1

Fluorine belongs to group 7A. How many covalent bonds are formed between two fluorine atoms?

Empirical formula

Formula of a compound with the smallest whole number mole ratio of the elements

Ideal gas constant

R represents the relationship among pressure, volume, temperature, and number of moles of gas present. What is "R"?

Mole

SI base unit used to measure the amount of a substance

NaBr • 2H2O

Sodium bromide dihydrate is correctly written as ____________________

Molecular formula

Specifies the actual number of atoms of each element in one molecule of a compound

Mass

Stoichiometry is based on the law of conservation of ___________

Combined Gas Law

Temperature, pressure, and volume are related for a fixed amount of gas

Gram/mole

The SI unit of molar mass is __________________

Measured experimentally

The actual yield of a product is _______________

Polar

The bent shape of a water molecule makes it ______________

A multiple of the mole ratio of the elements in its empirical formula

The mole ratio of the elements in a compound's molecular formula is _________________________

0 degrees Celsius and 1.00 atm

What are the conditions known as standard temperature and pressure (STP)?

Aqueous

What is the chemical state of the symbol (aq)?

Gas

What is the chemical state of the symbol (g)?

Liquid

What is the chemical state of the symbol (l)?

Solid

What is the chemical state of the symbol (s)?

P1V1 = P2V2

What is the equation for Boyle's Law?

V1/T1=V2/T2

What is the equation for Charles's law?

P1/T1=P2/T2

What is the equation for Gay-Lussac's Law?

PV=nRT

What is the equation for the Ideal Gas Law?

P1V1/T1=P2V2/T2

What is the equation for the combined gas law?

Tetrahedral

What molecular shape does the compound CCl4 have?

Number of moles

What variable is mentioned in the ideal gas law that is assumed to be constant in the other gas laws?

22.4 L

What volume will one mole of a gas occupy under standard temperature and pressure?

H2O

Which compound has the smallest molar mass? H2O2, H2O, CO, or CO2

Boron

Which is NOT a diatomic molecule? Fluorine, Nitrogen, Bromine, or Boron

N2O

Which is the correct formula for the compound dinitrogen monoxide? NO2, (NO)2, N2O1, or N2O

H3PO4

Which is the correct formula for the compound phosphoric acid? H3P, HPO3, H3PO4, or H3PO3

Chloric Acid

Which is the correct name for the compound HClO3? Hydrogen chlorate, chloric acid, hydrogen chloride trioxide, or hydrochloric acid

Nitrous acid

Which is the correct name for the compound HNO2? Hyponitrous acid, hydronitrogen dioxide, nitrous acid, or hydronitric acid

dinitrogen trioxide

Which is the correct name for the compound N2O3? Dinitro trioxide, nitrogen (II) oxide (III), trinitrogen dioxide, or dinitrogen trioxide

dinitrogen tetroxide

Which is the correct name for the compound N2O4? Tetranitrogen dioxide, dinitrogen tetroxide, dinitrogen quadoxide, or nitrogen oxide

phosphorus pentachloride

Which is the correct name for the compound PCl5? Monophosphorus tetrachloride, phosphorus chloride, phosphorus pentachloride, or pentaphosphorus chloride

SCl6

Which is the formula for the compound sulfur hexachloride? S6Cl, SCl6, SCl5, or S2Cl3

BH3

Which of the following compounds is an exception to the octet rule? BH3, CH4, NH3, or H2O

Ionic

Which type of bond has an electronegativity difference greater than 1.7?

Single covalent

Which type of bond has one pair of electrons shared between atoms?

Avogadro's principle

____________ _______________ states that the volume of one mole of any gas at STP is 22.4 L

Bond length

_____________ ______________ is the distance between the centers of the two nuclei of atoms bonded

Avogadro's number

6.02 x 10^23

Formula units KCl

A mole of potassium chloride (KCl) contains 6.02 x 10^23 __________________.

Coefficient

A number written in front of a chemical formula

Increases

A piston in an engine compresses the gas into a smaller volume. The pressure ________________

Decomposition reaction

A reaction in which a compound breaks down into two or more elements or new compounds

Combustion reaction

A reaction in which oxygen combines with a substance and releases heat and light energy

Single replacement reaction

A reaction in which the atoms of one element replace the atoms of another element in a compound

Double replacement reaction

A reaction involving the exchange of positive ions between two compounds dissolved in water

Precipitate

A solid produced during a chemical reaction in a solution

Reactant

A starting substance in a chemical reaction

Chemical equation

A statement that uses chemical formulas to show the identities and relative amounts of the substances involved in a chemical reaction

Product

A substance formed during a chemical reaction

Mole ratio

A(n) ______________ is a ratio between the number of moles of any two substances in a balanced chemical equation

Increases

Additional gas is added to a soccer ball. The pressure ______________

Decreases

An inflated balloon is placed in a refrigerator. The volume _______________

Mass

As a hydrated compound is heated, it decreases in __________________

Hydrate

Compound that has a specific number of water molecules bound to its atom

Decreases

Compressed air in scuba tanks cools off as a diver swims at deeper levels. The pressure in the tanks ___________________

The number of moles of the gas

Consider the ideal gas law and the ideal gas constant. What information do you need in order to determine the volume of the gas if you know the pressure, the temperature, and the ideal gas constant?

Avogadro's principle

Equal volumes of gases at the same temperature and pressure contain equal numbers of particles

2

How many pi bonds are there in a triple covalent bond?

4

How many single covalent bonds can carbon form?

Combustion

Identify the type of chemical reaction: 2C2H6 (g) + 7O2 (g) —> 4CO2 (g) + 6H2O (g)

Decomposition

Identify the type of chemical reaction: 2H2O2 (l) —> 2H2O (l) + O2 (g)

Double replacement

Identify the type of chemical reaction: 2KOH (aq) + H2SO4 (aq) —> K2SO4 (aq) + 2H2O (l)

Synthesis

Identify the type of chemical reaction: CO2 (g) + CaO (s) —> CaCO3 (s)

Single replacement

Identify the type of chemical reaction: Mg (s) + 2AgNO3 (aq) —> 2Ag (s) + Mg(NO3)2 (aq)

Coefficients

In a balanced chemical equation, the numbers of individual particles and the numbers of moles of particles are represented by the _____________

Penta

In naming the compound PCl5, the prefix used with the second element is ____________.

Number of moles

In the combined gas law, this variable is always constant.

Temperature

In the combined gas law, this variable is directly proportional to volume

Volume

In the combined gas law, this variable is inversely proportional to pressure

Coordinate covalent

In the reaction between BF3 and NH3, a _______________ ________________ type of bond is formed

25%

Methane (CH4) contains 75% carbon. What percentage of methane is hydrogen?

Balanced chemical equation

Mole ratios for a reaction are obtained from the ________________

1 sigma bond and 1 or 2 pi bonds

Multiple covalent bonds consist of which of these? 1 sigma bond only, 1 sigma bond and 1 or 2 pi bonds, 3 pi bonds only, or 1 sigma bond and 1 pi bond

Sulfuric acid

Name the acid with the following chemical formula: H2SO4

Percent composition

Percent by mass of each element in a compound

Efficiency

Percent yield of a product is a measure of a reaction's _______________

-ate

The name of an oxyacid has the suffix -ic acid. What is the suffix of the oxyanion?

Hydroionic

The name of the acid HI is _________________ acid.

Ideal Gas Law

The physical behavior of an ideal gas can be expressed in terms of the pressure, volume, temperature, and number of moles of gas present

Gay Lussac's Law

The pressure of a given mass of gas varies directly with the Kelvin temperature when the volume remains constant

Chemical reaction

The process by which the atoms of one or more substances are rearranged to form different substances

Trifluoride

The second part of the name of the compound NF3 is ________________.

Boyle's Law

The volume of a given amount of gas held at a constant temperature varies inversely with the pressure

Charles's Law

The volume of a given mass of gas is directly proportional to its kelvin temperature at constant pressure