Final Exam Chem

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what is the oxidation number of hydrogen in KH?

-1

what is the oxidation number of hydrogen in compounds containing metals?

-1

What is the oxidation number of oxygen in most compounds?

-2

In a compound, the algebraic sum of the oxidation number of all atoms equals

0

what is the oxidation number of a pure element?

0

The molar mass of LiF is 25.95 g/mol. how many moles of LiF are present in 10.37 g

0.3998 mol

For the reaction represented by the equation Pb(NO3)2 + 2KI → PbI2 + 2KNO3, how many moles of lead(II) iodide are produced from 300. g of potassium iodide and an excess of Pb(NO3)2?

0.904 mol

which coefficients correctly balance the formula equation CaO + H₂O = Ca(OH)₂?

1,1,1

which coefficients correctly balance the formula equation NH₄NO₂(s) = N₂(g) + H₂O(l)?1,1,2

1,1,2

For the reaction represented by the equation Cl2 + 2KBr → 2KCl + Br2, how many moles of potassium chloride are produced from 119 g of potassium bromide?

1.00 mol

For the reaction represented by the equation 2Na + 2H2O → 2NaOH + H2, how many grams of sodium hydroxide are produced from 3.0 mol of sodium with an excess of water?

120 grams

what is the percentage composition of CF4

13.6% C, 86.4% F

What is the formula mass of (NH4)2SO4

132.16 amu

in the reaction represented by the equation N2+3H2-->2NH3 what is the mike ratio if hydrogen to ammonia

2:1

which equation is not balanced?

2H2 + O2 = H2O

Which reaction does not occur?

2HF(aq) + Cl2(g) -> F2(g) + 2HCl(aq)

If 0.500 mol of Na+ combines with 0.500 mol of Cl- to form NaCl, how many formula units of NaCl are present

3.01 x 10^23

how many OH- ions are present in 3.00 mol of Ca(OH)2

3.61 x 10^24

For the reaction represented by the equation 2Na + 2H2O → 2NaOH + H2, how many grams of hydrogen are produced if 120g of sodium and 80g water are availble

4.5

What is the mass of 0.240 mol glucose, C6H12O6?

43.2 g

what is the percentage composition of CuCl2

47.27% Cu, 52.73% Cl

In the reaction represented by the equation 2Al2O3 → 4Al + 3O2, what is the mole ratio of aluminum to oxygen?

4:3

For the reaction represented by the equation 2HNO3 + Mg(OH)2 → Mg(NO3)2 + 2H2O, how many grams of magnesium nitrate are produced from 8.00 mol of nitric acid, HNO3, and an excess of Mg(OH)2?

593 grams

how many Mg2+ ions are found in 1.00 mol of MgO

6.02 x 10^23

how many oxygen atoms are there in 0.500 mol of CO2

6.02 x 10^23

The molar mass of NH3 is 17.03 g/mol. how many moles NH3 are present in 107.1 g

6.289 mol

what is the mass percentage of chlorine in NaCl?

60.7%

For the reaction represented by the equation AgNO3 + NaCl → NaNO3 + AgCl, how many moles of silver chloride, AgCl, are produced from 7.0 mol of silver nitrate AgNO3?

7.0 mol

When the formula equation Fe3O4 + Al → Al2O3 + Fe is correctly balanced, the coefficient of Fe is

9

For the reaction represented by the equation N2 + 3H2 → 2NH3, how many moles of nitrogen are required to produce 18 mol of ammonia?

9.0 mol

how many molecules are there in 5.0 g of methyl alcohol, CH3OH

9.4 x 10^22

For the reaction represented by the equation SO3 + H2O →H2SO4, calculate the percentage yield if 500. g of sulfur trioxide react with excess water to produce 575 g of sulfuric acid

91.2%

What is the formula mass of magnesium chloride, MgCl2

95.21 amu

What is the name of a list of elements arranged according to the ease with which they undergo certain chemical reactions?

Activity series

The measured amount of a product obtained from a reaction

Actual yield

What is the formula for aluminum sulfate?

Al2(SO4)3

which of the following is a formula equation for the formation of carbon dioxide from carbon oxygen?

C + O2 = CO2

A compound's empirical formula is CH. If the formula mass is 26 amu, what is the molecular formula?

C2H2

A compound's empirical formula is CH3. If the formula mass is 30 amu, what is the molecular formula?

C2H6

A Compound contains 27.3g of C and 72.7g of O. What is the empirical formula?

CO2

The reaction of calcium oxide, CaO, with water yields

Calcium hydroxide

What is the study of the mass relationships of elements in compounds?

Composition Stoichiometry

The reaction represented by the equation 2HgO(s) -> 2Hg(l) + O2(g) is a(n)

Decomposition reaction

The reaction represented by the equation Pb(NO3)2(aq) + 2KI(aq) -> PbI2(s) + 2KNO3(aq) is a

Double-displacement reaction

what is the formula for hydrochloric acid?

HCl

Oxides of active metals, such as CaO, react with water to produce

Metal hydroxides

In the word equation, sodium oxide + water >> sodium hydroxide, the formula for sodium hydroxide is represented by

NaOH

Predict what happens when nickel is added to a solution of potassium chloride

No reaction occurs

What is the formula for the compound formed by lead (II) ions and chromate ions?

PbCrO4

When a slightly soluble solid compound is produced in a double-displacement reaction, a

Predicate is formed

what is the balanced equation for the combustion of sulfur?

S(s) + O2(g) = SO2(g)

What is the formula for sulfur dichloride?

SCl2

What is the formula for silicon dioxide?

SiO2

What can be predicted by using an activity series?

Whether a certain chemical reaction will occur

A molecular compound has the empirical formula XY3. Which of the following is a possible molecular formula?

X2Y6

The complete balanced equation for the reaction between zinc hydroxide and acetic acid is

Zn(OH)2 + 2CH3COOH Zn(CH3COO)2 + 2H2O

A chemical formula for a molecular compound represents the composition of

a molecule

What is the maximum possible amount of product obtained in a chemical reaction?

actual yield

In the equation 2Al(s) + 3Fe(NO3)2(aq) -> 3Fe(s) + 2Al(NO3)3(aq), iron has been replaced by

aluminum

Name the compound Al2S3

aluminum sulfide

An element in the activity series can replace any element

below it on the list

name the compound CCl4 using the stock system

carbon(IV) chloride

To balance a chemical equation, it may by necessary to adjust the...

coefficients

To balance a chemical equation, it may necessary to adjust the

coefficients

The reaction represented by the equation 2KClO3(s) -> 2KCl(s) + 3O2(g) is a(n)

decomposition

In what kind of reaction does a single compound produce two or more simpler substances?

decomposition reaction

Name the compound N2O3

dinitrogen trioxide

In what kind of reaction do the ions of two or compounds exchange places in aqueous solution to form to new compounds

double displacement reaction

the equation AX + BY = AY + BX is the general equation for

double-displacement reaction

a formula that shows the simplest whole number ration of the atoms in a compound is the

empirical formula

what is the sum of the atomic masses of all the atoms in a formula for a compound?

formula mass

A compound contains 64 grams of O and 8 grams of H. What is the empirical formula for this compound?

h20

The replacement of bromine by chlorine in a salt is an example of a single-displacement reaction by

halogens

Group 1 metals react with water to produce metal hydroxides and

hydrogen

Magnesium hydroxide decomposes to yield magnesium oxide and

hydrogen

Which word equation represents the reaction that produces water from hydrogen and oxygen?

hydrogen plus oxygen yields water

Name the compound Fe(NO3)2

iron (II) nitrate

In most chemical reactions the amount of product obtained is

less than the theoretical yield

which reactant controls the amount of product formed in a chemical reaction

limiting reactant

When heated, metallic chlorates decompose into

metallic chlorides and oxygen

in the chemical reaction represented by the equation wA +xB -->yC+zD a comparison if the number of moles of A to the number of moles of C would be an

mole ratio

a balanced chemical equation allows one to determine the

mole ratio of any two

Name the compound N2O2 using the stock system

nitrogen(II) oxide

A chemist interested in the efficiency of a chemical reaction would calculate the

percent yield

What is the ratio of the actual yield to the theoretical yield, multiplied by 100%

percentage yield

the coefficients in a chemical equation represent the

relative numbers of moles of reactants and products

An active metal and a halogen react to form a(n)

salt

A chemical equation is balanced when the

same number of each kind of atom appears in the reactants and in the products

The reaction represented by the equation Mg(s) + 2HCl(aq) -> H2(g) + MgCl2(aq) is a

single-displacement reaction

Which branch of chemistry deals with the mass of relationships of elements in compunds and the mass relationships among reactants and products in chemmical reactions?

stoichiometry

What is the small whole number that appears as a factor in front of a formula in a chemical reaction

subscript

Name the compound SO3

sulfur trioxide

in what kind of reaction do two or more substances combine to form a new compound?

synthesis reaction

the equation A + X = AX is the general reaction for a

synthesis reaction

If the percent yield is equal to 100 then

the actual yield is equal to the theoretical yield

in the chemical equation wA+xB-->yC + zD if one knows the mass of A and the molar masses of A B C D one can determine

the mass of any of the reactants or products

A chemical formula includes the symbols of the elements in the compound and subscripts that indicate

the number of atoms or ions of each element that are combined in the compound

to determine the limiting reactant in a chemical reaction involving known masses of A and B, one could first calculate

the number of moles of B and the number of moles of A available

the word equation solid carbon + oxygen gas --> carbon dioxide gas + energy represents a chemical reaction because...

the reaction releases energy

Some acids, such as carbonic acid, decompose to nonmetal oxides and

water


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