Chemistry Final

A 1.45 g sample of chromium contains __________ atoms. a. 1.6 ×1022 b. 4.54 ×1025 c. 8.73 ×1023 d. 2.16 ×1025

a. 1.6 ×1022

The catalytic conversion of ammonia to nitric oxide is the first step in a three-step process which ultimately results in nitric acid. Balance the equation for the reaction. aNH3(g) + bO2(g) → cNO(g) + dH2O(g) a. a=6,b=15,c=6,d=9 b. a=4,b=5,c=4,d=6 c. a=2,b=1,c=2,d=1 d. a=3,b=2,c=3,d=3

a=4,b=5,c=4,d=6

Perform the following calculation with the correct number of significant figures: 20.0 × 11.55/ 0.00004 × 58.38 a. 98900 b. 98920.8 c. 1 × 10 5 d. 98920

b. 98920.8

Perform the following calculation with the correct number of significant figures: 5.453 + 8.34 − 20.1 + 4 − 6.321 a. 8.628 b. -8.628 c. -8.63 d. -9

-8.63

What quantity of gas, in moles, is contained in 2.21 L at STP? a. .2948 mol b. .0454 mol c. .0987 mol d. .1974 mol

0.0987mol

At what temperature will this substance melt if the pressure is held constant at 1.2 atm

68°C

2,500grams of MgSO4

7

What mass of oxygen is present in 10.0 grams of carbon dioxide (CO2)? a. 0.227g b. 7.27g c. 4.40g d. 8.80g

7.27g

Which is the triple point of this substance?

88° C, 0.95 atm

Which statement provides the best description of a covalent bond? a. A covalent bond is the attraction between opposite charges of ions in a compound. b. A covalent bond is usually stronger than an ionic bond. c. A covalent bond usually forms between a metal and a nonmetal. d. A covalent bond is the attraction between atoms when they share electrons.

A covalent bond usually forms between a metal and a nonmetal.

When a chemical change occurs: a. the chemical properties of new substances are different from the ones you started with. b. atoms are rearranged. c. the law of conservation of mass is always obeyed. d. All of the above

All of the above

Which is the smallest part of an element that retains all the properties of the element? Electron Proton Neutron Atom

Atom

Which one is comprised of the other three? a. proton b. neutron c. atom d. electron

Atom

Which two are isotopes of one another? a. Atoms1&4 b. Atoms1&3 c. Atoms1&2 d. Atoms2&3

Atoms 1 & 4

Which two have the same mass? a. Atoms1&4 b. Atoms2&4 c. Atoms1&2 d. Atoms2&3

Atoms 2&4

The single variable which is observed and studied during an experiment, who's results are compared to a known value, is called which of the following: a. Independent Variable b. Dependent Variable c. Control d.Constant

Dependent Variable

Water has a specific heat of 4.18 J/g

65.0oC

The pre-fix milli represents which of the following values? a. 1.0×103 b. 1.0×10−3 c. 1/1000000 d.1/100

1.0×10−3

The volume noted in the figure contains nitrogen gas under a pressure of 2.487 atm at 15.9°C. Calculate the number of moles of nitrogen in the tank. a. 0.018 mol b. 0.525 mol c. 1.90 mol d. 0.002 mol

1.90mol

Which is the point at which this substance will boil at normal atmospheric pressure? a. 110°C, 1.00 atm b. 0°C, 0.18 atm c. 88°C, 0.95 atm d. 100°C, 0.95 atm

110°C, 1.00 atm

If 16.4 g of oxygen gas react with excess hydrogen, what mass of water is produced? 2H2(g) + O2(g) → 2H2O(g) a. 9.23g b. 23.9g c. 36.9g d. 18.5g

18.5g

Which is the correct electron configuration for the element Molybdenum (Mo)? a. 1s22s22p63s23p64s23d1 04p65s24d4 b. 1s22s22p63s23p64s24d1 04p65s25d4 c. 1s22s22p63s23p64s23d1 04p65s6 d. 1s22s22p63s23p64s23d4

1s22s22p63s23p64s23d1 04p65s24d4

What are the values for x and y, respectively, in Alx(SO4)y? a. 2and3 b. 1and3 c. 1and1 d. 3and2

2 & 3

How many moles of ammonia can be made by reacting 7.0 mol of N2 with 4.0 mol of H2? N2(g) + 3H2(g) → 2NH3(g) a. 4.0mol b. 7.0mol c. 14mol d. 2.7mol

2.7mol

Which is the number of protons in 56 Fe? 26 a. 82 b. 30 c. 26 d. 56

26

The combustion of methanol, CH3OH, yields carbon dioxide and water as products. Which of the reactions below is correct and properly balanced? a. CH3OH(l) + O2(g) → CO2(g) + 2H2O(g) b. CH3OH(l) + O2(g) → CO2(g) + H2O(g) c. 2CH3OH(l) + 3O2(g) → 2CO2(g) + 4H2O(g) d. 2CH3OH(l) + 2O2(g) → 2CO2(g) + 2H2O(g)

2CH3OH(l) + 3O2(g) → 2CO2(g) + 4H2O(g)

A balloon is filled with 3.50 L of water at 24.0°C and 2.27 atm. The balloon in the figure is placed outside on a hot day, what is the volume of the balloon (assuming constant pressure)? a. 3.38 L b. 3.61 L c. 2.47 L d. 8.19 L

3.61

The calculation of 22.81 ÷ 2.2457 would have how many significant figures? a. 9 b. 4 c. 10.16 d. 5

4

Aluminum has a specific heat of 0.902 J/goC. How many joules of heat are required to change the temperature of 8.50 grams of aluminum from 25.0oC to 93.4oC? a. 524J b. 483J c. 7.67J d. 192J

524J

The molar mass of argon is 39.95 g/mole. What is the mass of a single argon atom? a. 2.406 ×10-25 g b. 1.507 ×10-22 g c. 8.441 ×10-23 g d. 6.634 ×10-23 g

6.634 ×10-23 g

Determine the heat of reaction for the decomposition of one mole of benzene to acetylene. C6H6-3CH2 2C6H6 + 15O —> 12CO2 + 6H2O delta H -6271kJ 2C2H2 + 5O2 —> 4CO2 + 2H2O delta H -2511kJ a.3760kJ b. 6902kJ c.631kJ d.8782 kJ

631kJ

Which law describes the proportional relationship between the pressure and volume of a gas? a. Gay-Lussac's Law b. Charles's Law c. Natural Law d. Boyle's Law

Boyle's Law

What is the whole number placed in front of a molecular formula in a chemical equation called? a. Subscript b. Superscript c. Coefficient d. Mole

Coefficient

The _____ in a balanced equation specify volume ratios for gaseous reactants and products a. variables b. masses c. coefficients d. constants

Coefficients

Which question would be the best high level scientific question? a. Which paper plane design is the best? b. How fast will a tennis ball bounce off if thrown against the wall? c. Does the amount of fertilizer used on plants affect the size to which they grow? d. How many giraffes live in Africa?

Does the amount of fertilizer used on plants affect the size to which they grow?

Classify the following reaction: 3CuSO4 + 2Al → Al2(SO4)3 + 3Cu a. Addition or synthesis b. Single-displacement or single replacement c. Double-displacement or double replacement d. Decomposition

Double- displacement or double replacement

Classify the following reaction: Cu(NO3)2 + 2NaOH → Cu(OH)2 + 2NaNO3 a. Single-displacement or sinle replacement b. Addition or synthesis c. Decomposition d. Double-displacement or double replacement

Double-displacement or double replacement

Which of the following should never be used on a person? a.Eye wash station b. Safety shower c. Fire blanket d. Fire extinguisher

Fire extinguisher

Which pre-fix corresponds to value of one billion? a. Giga b. Micro c. Nano d. Mega

Giga

Which of the following substances is an element? a. Iron b. Salt c. Baking soda d. Sugar

Iron

Which of the following is not a qualification of a good hypothesis? a. Is worded as an if/then statement. b. It is a prediction. c. States the independent and dependent variable. d. Is an educated guess.

It is a prediction.

What is the correct formula for Lithium oxide. a. LiO b. Li2O2 c. LiO2 d. Li2O

Li2O

What is the name of a compound with the formula of MgCl2? a. Monomagnesium dichloride b. Magnesium chloride c. Magnesium chlorine d. Magnesium dichloride

Magnesium dichloride

333 cm is equivalent to 0.333 ___________ . a. meters b. killometers c. decameters d. millimeters

Meters

Which pre-fix corresponds to value of one one-millionth (10−6)? a. Nano b. Giga c. Micro d. Mega

Micro

Which atom is likely to form a -3 ion? a.O b.N c.Al d.Li

Nitrogen

Use VSEPR theory to predict the molecular geometry of SF6. a. bent b. triangular planar c. linear d.octrhedral

Octahedral

Which of the following units is not an SI (Metric) unit? a. milliliters b. meters c. pounds d. kilograms

Pounds

According to the modern concept of the atom, which are located in the nucleus of an atom? Protons only Protons and neutrons Electrons and protons Neutrons and electrons

Protons & nuetrons

What state of matter will this substance be in at a temperature of 28 degrees C and a pressure of 0.7 atm? Liquid Solid Gas In equilibrium between solid and gas

Solid

What is a small whole number to the right in a chemical formula indicating the number of atoms in a molecule called? a. Subscript b. Mole c. Superscript d. Coefficient

Subscript

Matter that has a uniform and unchanging composition is known as a(n) ____. a. substance b. element c. compound d. mixture

Substance

Use the VESPR theory to predict the molecular geometry of phosgene, Cl2CO t-shaped Triangular bipyramidial Triangular planar Tetrahedral

Tetrahedral

Which statement best describes what happens to sodium and chlorine atoms when they combine to form sodium chloride? a. The sodium atom becomes a positive chloride ion, and the chlorine atom becomes a negative sodium ion. b. The sodium atom becomes a negative chloride ion, and the chlorine atom becomes a positive sodium ion. c. The sodium atom becomes a positive sodium ion, and the chlorine atom becomes a negative chloride ion. d. The sodium atom becomes a negative sodium ion, and the chlorine atom becomes a positive chloride ion.

The sodium atom becomes a positive sodium ion, and the chlorine atom becomes a negative chloride ion

Which is defined as the combination of pressure and temperature at which all three states of matter can coexist at equilibrium? a. deposition point b. triple point c. critical point d. melting point

Triple point

What is the correct name for K3PO4? Potassium(1) phosphate Potassium phosphate Tripotassium phosphate Potassium(1) monophosphorous tetraoxide

Tripotassium phosphate

The sum of the oxidation numbers in a neutral compound is always A negative number A positive number Zero One

Zero

A pair of electrons that is shared between two atoms is a. a double bond. b. an ionic bond. c. both a covalent bond and a double bond d. a covalent bond.

a covalent bond

Hydrazine, a fuel used to power rocket engines, is a product of the reaction between ammonia and bleach. Balance the equation for the reaction. aNH3(aq) + bOCl-(aq) → cN2H4(l) + dCl-(aq) + eH2O(l) a. a=2,b=1,c=2,d=1,e=2 b. a=2,b=2,c=1,d=2,e=2 c. a=4,b=3,c=1,d=3,e=1 d. a=2,b=1,c=1,d=1,e=1

a=2 b=1 c=1 d=1 e=1

A large equilibrium constant.. a.indicates that the reaction favors the formation of products. b.indicates that a reaction has a large rate constant. c.indicates that a reaction has a small rate constant. d.results from the addition of a catalyst to a reaction mixture.

indicates that the reaction favors the formation of products.

What is the correct name for K3PO4? a. potassium(I) monophosphorus tetraoxide b. potassium(I) phosphate c. potassium phosphate d. tripotassium phosphate

potassium phosphate

Heat capacity is defined as a. the amount of heat necessary to raise the temperature of a system by 1oC. b. 4.18 J/g c.4.18 cal/g

the amount of heat necessary to raise the temperature of a system by 1oC.

The principle of conservation of atoms is satisfied in a chemical equation when: a. the reactant side has the same number of each type of atom as the product side. b. all of the atoms involved in the equation have an oxidation number of 1+. c. the sum of the coefficients on the reactant side is the same as the sum of the coefficients on the product side. d. each atom on the product side has the same subscript that it had on the reactant side.

the reactant side has the same number of each type of atom as the product side.

The molar masses of helium and oxygen are 4.0 g/mol and 16 g/mol, respectively. At the same temperature and pressure, 1 mole of helium will occupy a. twice the volume of 1 mole of oxygen. b. four times the volume of 1 mole of oxygen. c. half the volume of 1 mole of oxygen. d. the same volume as 1 mole of oxygen.

the same volume as 1 mole of oxygen.

Use VSEPR theory to predict the molecular geometry of BH3. a. tetrahedral b. triangular pyramidal c. triangular bipyramidal d. triangular planar

triangular planar

All of the following relationships are false for gases EXCEPT a. volume is directly proportional to the gas constant R. b. volume is inversely proportional to the moles of gas. c. volume is directly proportional to temperature in Kelvin. d. volume is directly proportional to pressure in atmospheres. e. volume is directly proportional to pressure in mm Hg.

volume is directly proportional to the gas constant R.