Unit 5 Test - Ch. 8-9

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Which equation is not balanced?

2H2 + O2 -> H2O

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

No reaction occurs

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

Percent yield

To determine the limiting reactant in a chemical reaction, one must know the

available amount of each reactant.

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

theoretical yield

In the equation 2KCO , → 2KCI + 302 , how many moles of oxygen are produced when 3.0 mol of KCIO3 decompose completely?

4.5mol

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

Activity series

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

C + O2 -> CO2

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

Decomposition reaction

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

Decomposition reaction

A chemical formula written over the arrow in a chemical equation signifies

a catalyst for the reaction

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3Fe(s) + 2Al(NO3)3(aq), iron has been replaced by

aluminium

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

decomposition

In one type of synthesis reaction, an element combines with oxygen to yield a(n)

oxide

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

In the reaction represented by th e equation N2 + 3H2 → 2NH3 , what is the mole ratio of nitrogen to ammonia ?

1:2

Ozone, O3, is produced by the reaction represented by the following equation: NO2(g)+O2(g)-->NO(g)+O3(g) What mass of ozone will form from the reaction 2.0 g of NO2 in a car's exhaust and excess oxygen?

2.1 g O3

For the reaction represented by the equation C + 2H → CH . how many moles of hydrogen are required to produce 10 mol of methane, CH4?

20 mol

For the reaction represented by the equation so , + H2O → H25 . how many grams of sulfuric acid can be produced from 200. g of sulfur trioxide and 100. g of water?

245g

What is the balanced equation when aluminium reacts with copper (II) sulfate?

2Al + 3CuSO4 ------> Al2(S04)3+3Cu

The Haber process for producing ammonia commercially is represented by the equation N2 ( g ) + 3H2 ( g ) → 2NH (2). To completely convert 9.0 mol hydrogen gas to ammonia gas, how many moles of nitrogen gas are required?

3.0mol

For the reaction represented by the cquation 2Na + 2H , 0 → 2NaOH + H2 , how many grams of hydrogen are produced if 120. g of sodium and 80. g of water are available?

4.5 g

In the reaction represented by the equation 2A10 → 4A1 + 302 what is the mole ratio of aluminum to oxygen?

4:3

For the reaction represented by the equation CH4 + 2O2 → CO2 + 2H2O, how many moles of carbon dioxide are produced from the combustion of 100. g of methane?

6.23 mol

For the reaction represented by the equation 2Na + Cl → 2NaC how many grams of sodium chloride can be produced from 500. g each of sodium and chlorine?

824 g

When the equation Fe3O4 + Al -> Al2O3 + Fe is correctly balanced, what is the coefficient of Fe?

9

For the reaction represented g of chlorine react with excess potassium by the equation Cl + 2KBr - 2KCI + Br2 , calculate the percentage yield if 200 . bromi de to produce 410. g of bromine.

91.0 %

percentage What is the ured amount of a product obtained from a chemical reaction?

Actual yield

Predict what happens when calcium metal is added to a solution of magnesium chloride.

Calcium chloride forms

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

Double-displacement reaction

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

Double-displacement reaction

In writing a chemical equation that produces hydrogen gas, the correct representation of hydrogen gas is

H2

Given the equation 3A + 2B → 2C the starting mass of A, and its molar mass, and you are asked to determine the moles of C produced, your first step in solving the problem is the multiply the given mass A by

I mol A / molar mass A

If metal X is lower than metal Y in the activity series, then metal X

Loses electrons less readily than does metal Y

In the chemical equation 2Mg(s) + O2(g) ? 2MgO(s)

Mg represents the reagent magnesium

Magnesium bromide (aq) + chlorine (g) yields

MgCl2(aq) and Br2(l).

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

NaOH

Predict what happens when zinc is added to water

No reaction occurs

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

Single - displacement reaction

The reaction represented by the equation Cl2(g) + 2KBr(aq) -> 2KCl(aq) + Br2(l) is a(n)

Single displacemet

The equation A + BX -> AX + B is the general equation for a

Single-displacement reaction

which branch of chemistry deals with the mass relationships of elements in compounds and the mass relationships among reactants and products in chemical reactions?

Stoichiometry

The reaction represented by the equation 2Mg(s) + O2(g) -> 2MgO(s) is a

Synthesis reaction

What can be predicted by using an activity series?

Whether a certain chemical reaction will occur

When a solid produced by a chemical reaction separates from the solution it is called

a precipitate

The ability to an element to react is the element's

activity

According to the law of conservation of mass, the total mass of the reacting substances is

always equal to the total mass of the products

An element in the activity series can replace any element

below it on the list

Which observation does not indicate that a chemical reaction has occurred?

change in total mass of substances

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

coefficients

The equation AX -> A + X is the general equation for a

decomposition reaction

In what kind of reaction does one element replace a similar element in a compound?

displacement reaction

The equation AX + BY -> AY + BX is the general equation for a

double-displacement reaction

Which reactant controls the amount of product formed in a chemical reaction?

limiting reactant

A chemical reaction involving substances A and B stops when B is completely used. B is the

limiting reactant.

After calculating g the amount with the amount of B available, one can determine the of reactant B required to completely react with A, then comparing that amount

limiting reactant.

Each of the four types of reaction stoichiometry problems require using

mole ratio

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

percentage yield.

When the limiting reactant in a chemical reaction is completely used, the

reaction stops.

The coefficients in a chemical equation represent the

relative numbers of moles of reactants and products

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 equation for a(n)

synthesis reaction

Which of the following would be investigated in reaction stoichiometry?

the mass of potassium required to produce a known mass of potassium chloride

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

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

In a double-displacement reaction, hydrogen chloride and sodium hydroxide react to produce sodium chloride. Another product is

water

In an equation, the symbol for a substance in water solution is followed by

(aq)

Which coefficients correctly balance the formula equation CaO + H2O -> Ca(OH)2

1,1,1

For the reaction represented by the equation 2H2 + 0 -> 2HO , how many grams of water are produced from 6.00 mol of hydrogen?

108g

Which reaction does not occur?

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

The units of molar mass are

g/mol.


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