chemistry semester exam

Which statement best describes the alkaline earth elements?

They have two valence electrons, and they form ions with a 2+ charge

What is the formula of titanium (ii) oxide?

TiO

What is the volume, in liters, of 576 grams of SO4 gas at STP?

202

Given the equation C3H8(g)+5O2(g)—->3CO2(g)+4H2O(g) At STP, how many liters of O2(g) are needed to completely burn 5.0 liters of C3H8(g)?

25

Al2(SO4)3+Ca(OH)2—->Al(OH)3+CaSO4 What is the coefficient in front of the CaSO4 when the equation is completely balanced with the smallest whole number coefficients?

3

Given the reaction HNO3+H3PO3——>NOH3PO4+H2O When the reaction is completely balanced using the smallest whole numbers, the coefficient of H3PO4 will be

3

What is the total number of orbitals containing only one electron in an atom of nitrogen in the ground state?

3

Given the reaction 2SO2(g)+O2(g)—->2SO3(g) What is the total number of liters of SO3 produced when 32.0 liters of SO2 reacts completely?

32.0 L

A sample of H2(g) at STP contains 9.03 x 10^23 molecules. The volume of the sample is

33.6 L

Given the balance equation Mg(s)+2HCl(aq)——>MgCl2(aq)+H2(g) At STP, what is the total number of liters of hydrogen gas produced when 3.00 moles of hydrochloric acid solution is completely consumed?

33.6 L

What is the volume of 1.50 moles of an ideal gas at STP?

33.6 L

Atom X is in group IIA and atom Y is in Group VIIA, A compound formed between these two elements would have the formula

XY2

What is the chemical formula for zinc carbonate?

ZnCO3

Which of the following electron configurations represents the least active metal?

[Ne]3s^2

Element A and element B chemically combine to be form substance C. Substance C must be

a compound

Which type of bond is found in a molecule of methane

a covalent bond

The formula H2O2 is an example of

a molecular formula

Which material is a mixture?

air

Which is an example of a compound?

ammonia

What is the correct name of the compound with the NH4NO2?

ammonium nitrite

An orbital is defined as a region of the most probable location of

an electron

Which particle has the same electron configuration as a potassium ion?

argon atom

In the modern periodic table, the elements are arranged order or increasing

atomic number

If an equation is balanced properly, both sides of the equation must have the same number of

atoms

Electronegativity is a measure of an atom's ability to

attract the electrons in the bond between the atom and another atom

Which temperature change would cause a sample of an ideal gas to double in volume while the pressure in held constant?

from 200. K to 400. K

The pH of a 0.1 M CH2COOH solution is

greater than 1 but less than 7

When sugar is dissolved in water, the resulting solution is classified as a

homogeneous mixture

What is the name of the compound whose formula is H2SO4

sulfuric acid

Given the reaction N2(g)+3H2(g)—> 2NH3 (g) What is the ratio of moles of H2 (g) consumed to moles of NH3 (g) produced?

3:2

How many liters of a 0.5 M sodium hydroxide solution would contain 2 moles of solute?

4 L

Given the reaction Ca+ 2H2O—->Ca(OH)2+H2 How many moles of H2O are needed to exactly react with 2.0 moles of Ca?

4.0

Given the reaction: Ca+2H2O—-> Ca(OH)2+H2 How many moles of H2O are needed to react completely with 2.0 moles of Ca?

4.0 moles

Given the reaction at STP N2(g)+3H2(g)——>2NH3(g) What is the total number of liters of NH3 formed when 20 liters of N2 reacts completely?

40 L

Given the reaction 4Al+3O2(g)—->2Al2O3(s) What is the minimum number of grams and oxygen gas required to produce 1.00 mole of aluminum oxide?

48.0 g

Given the incomplete equation 2N2O5—> Which set of products completes and balances the incomplete equation?

4NO2(g) + O2 (g)

What is the total number of valence electrons in an atom with the electron configuration 1s^2 2s^2 2p^6 3s^2 3p^3

5

When the equation H2O2—>H2O+O2 is completely balanced, the sum of all the coefficients will be

5

The volume of 16.0 grams of SO2(g) at STP is closest to

5.60 L

How many grams of ammonium chloride (gram formula mass=53.5 g) are contained in 0.500 L of a 2.00 M solution?

53.5 g

Given the balanced equation Fe(s)+CuSO4(aq)—->FeSO4(aq)+Cu(s) What total mass of iron is necessary to produce 1.00 mole of copper?

55.8 g

How many moles of solute would 3 liters of a 2-molar solution contain?

6

What is the total number of moles of oxygen atom present in 1 mole of Mg(ClO3)2?

6

Given the balanced ionic equation 3Pb(aq)+2Cr(s)——>3Pb(s)+2Cr(aq) What is the number of moles of electrons gained by 3.0 moles of lead ion?

6.0 mol

Given the reaction CH4(g)+2O2(g)——>CO2(g)+2H2O(g) How many moles of oxygen are needed for the complete combustion of 3.0 moles of CH4(g)?

6.0 moles

What is the total number of carbon atoms contained in 22.4 liters of CO gas at STP?

6.02 x 10^23

Given the reaction N2(g)+3H2—->2NH3(g) What is the total number of moles NH3(g) produced when 10 moles of H2(g) reacts completely with N2(g)?

6.7

At STP, the volume occupied by 32 grams of a gas is 11.2 liters. The gram molecular mass of this gas is closest to

64 g

Given the reaction 2Al+3H2SO4—> 3H2+Al2(SO4)3 The total number of moles of H2SO4 needed to react completely with 5.0 moles of Al is

7.5 moles

The diagram given shows a eudiometer tube in a bath water. The water levels inside and outside the tube are equal. If the atmospheric pressure is 750 torr, what is the pressure inside the tube?

750 torr

A 0.500-mole sample of a gas has a volume of 11.2 liters at 273K. What is the pressure of the gas

760 torr

What is the total number of valence electrons in an atom of xenon?

8

The following data were recorded while determining the solubility of a certain salt. Which graph best represents the solubility of this salt? (temp and grams solute/100 gH2O)

A

Which orbital notation correctly represents the outermost principal energy level of a nitrogen atom in the ground state?

A

Which the formula of a binary compound?

Al2S3

If 0.50 liter of a 12 molar solution is diluted to 1.0 liter, the molarity of the new solution is

B.) 6.0

The orbital notation of an atom in the ground state is 1s2 and 2s2. Which atom is represented by this notation?

Be

Which of the following elements has the greatest ability to attract electrons?

Be

Which orbital notation represents an atom of beryllium in the ground state?

C

Given the equation X+Cl2—->C2H5Cl+HCl Which molecule is represented by X?

C2H6

What is the molecular formula of a compound that has a molecular mass of 42 and an empirical formula of CH2

C3H6

The gram molecular mass of CO2 is the same as the gram molecular mass of

C3H8

Which compound has the least ionic character?

CCl4

Which substance represents a compound?

CO(g)

Which ion has the electron configuration of a noble gas?

Ca2+

The correct formula for calcium phosphate is

Ca3(PO4)2

Which substance is classified as a salt?

CaCl2

Which element in period 3 has the greatest tendency to gain electrons

Cl

Which particle has the largest radius

Cl-

What is the chemical formula for copper (ii) hydroxide

Cu(OH)2

Which formula represents copper(i) oxide

Cu2O

When the equation Al (s)+O2(g)——>Al2O3(s) is correctly balanced using the smallest whole numbers, the coefficient of Al(s) is

D. 4

Which atom has the strongest attraction for electrons

F

Which is the most active nonmetal in the periodic table of the elements?

F

Which formula correctly represents iron (iii) oxide?

Fe2O3

Which formula correctly represents the composition of iron (iii) oxide?

Fe2O3

What is the chemical formula of iron (iii) sulfide

Fe2S3

What is the correct formula for iron(ii) sulfide?

FeS

What is the molarity of a solution that contains 0.25 mole of solute in 250 milliliters of solution?

1.0 M

Given the reaction 4Al+3O2—>2Al2O3 Which is the total number of moles aluminum oxide that can be formed when 54 g of aluminum reacts completely with oxygen?

1.0 moles

What is the molarity of a solution that contains 0.50 mole of NaOH in 0.50 liter of solution?

1.0M

Show a numerical setup for determining how many liters of a 1.2 M solution can be prepared with 0.50 mole of C6H12O6

1.2=0.50/x

How many moles of H2SO4 are needed to prepare 5.0 liters of 2.0 M solution of H2SO4?

10

A 2.00 gram sample of helium gas at STP will occupy

11.2 L

Given the balance equation representing a reaction CaO(s)+CO2—>CaCO3(s)+heat What is the total mass of CaO(s) that reacts completely with 88 grams of CO2(g) to produce 200 grams of CaCO3(s)?

112 g

Given the reaction Mg+2HCl —-> MgCl2+H2 What is the total number of grams of Mg consumed when 0.50 mole of H2 is produced?

12 g

What is the gram formula mass of K2CO3

138 g

Which quantity of N2 gas has a volume of 11.2 liters at STP?

14.0 grams

What is the total number of electrons in an atom of potassium

19

What is the gram formula mass of Mg(ClO3)2?

191 g

Given the balance equation representing a reaction: F2(s)+H2(g)—-> 2HF(g) What is the mole ratio of H2(g) to HF(g) in this reaction?

1:2

What is the electron configuration for Be+2 ions?

1s2

Which electron configuration represents an atom in the excited state

1s2 2s2 2p5 3s2

What is the maximum number of electrons that can occupy an orbital?

2

When the equation Hg+Ag^+——>Ag+Hg^+2 it correctly balanced using smallest whole numbers, the coefficient in front of the Ag+ will be

2

When the equation NO3-+4H++Cu——>cu+2+NO2+2H2O is correctly balanced, the coefficient of NO3- is

2

When the equation Na(s)+H2O(l)—->NaOH(aq)+ H2(aq) is correctly balanced using smallest whole numbers, the coefficient of the water is

2

When the reaction Cu+H2SO4—>CuSO4+SO2+H2O is completely balanced using smallest whole numbers, the coefficient of H2O will be

2

Chlorine combines with element M to form a compound with the formula MCl2. Which group in the periodic table contains element M?

2 (IIA)

Which solution contains the greatest number of moles of solute?

2 L of 2 M

What is the molarity of a solution of NaOH if 2 liters of the solution contains 4 moles of NaOH

2 m

What is the molarity of a solution that contains 40 g of NaOH in 0.50 liter of solution?

2.0 M

Given the balance equation 2Na+S—>Na2S What is the total number of moles S that reacted when 4.0 moles of Na were completely consumed?

2.0 moles

Which of the following elements has the highlight electronegativity?

H

Which of the following bonds exhibits the greatest ionic character?

H-F

Which formula represents a hydronium ion?

H3O+

Which formula represents a mixture?

HCl(aq)

Which formula represents strontium phosphate?

Sr3(PO4)2

An atom that has an electron configuration of 1s2 2s2 2p6 3s2 3p6 3d5 4s2 is classified as

transition element

Which electronegativity is possible for an alkali metal?

1.0

What is the correct formula of potassium hydride?

KH

Which symbol represents an alkaline earth element?

Mg

The correct formula for sodium oxide is

Na2O

What is the chemical formula for sodium sulfate?

Na2SO4

Which compound contains ionic bonds?

NaBr(s)

Which of the following represents a mixture?

NaCl(aq)

Which is the formula for sodium perchlorate?

NaClO4

Given the balance equation 2Na+2H2O—>2X+H2 What is the correct formula for the product represented by the letter X?

NaOH

Which of these elements has an atom with the most stable outer electron configuration?

Ne

Which gas is monatomic at STP?

Neon

The chemical formula for nickel (ii) bromide is

NiBr2

Which of the following elements has the strongest attraction for electrons?

Oxygen

Which atom in the ground state has three halffilled orbitals?

P

Which formula represents lead (ii) chromate?

PbCrO4

Which is the formula for lead (ii) oxide?

PbO

Which polyatomic ion has a charge of 3-?

Phosphate ion

Which element at STP is a poor conductor of electricity and has a relatively high electronegativity?

S

Which species does not have a noble gas electron configuration?

S

How many moles of solute are contained in 200 milliliters of a 1 M solution?

0.2

91.

0.250L(0.200 mol/1L)

In which period are all the elements gases at 298 K and standard pressure?

1

What is the molarity of a solution containing 20 grams of NaOH in 500 milliliters of solution?

1 M

At constant temperature, which line best shows the relationship between the volume of an ideal gas and its pressure?

B

Which orbital notation represents a boron atom in the ground state?

B

Which orbital notation represents an atom in the ground state with 6 valence electrons?

B

Which is the electron configuration of a neutral atom in the ground state with a total of six valence electrons?

B.) 1s^2 2s^2 2p^4

Which halogen is a solid at STP

Iodine

Which pair of elements form an ionic bond with each other?

KCl

Which unit can be used to express solution concentration?

mol/L

Molarity is defined as the

moles of solute per liter of solution

The molarity (M) of a solution is equal to the

number of moles of solute/ liter of solution

The volume of a 1.00-mole sample of an ideal gas will decrease when the

pressure increases and temperature decreases