Chemistry Quarterly 4

In the reaction, CH4 + 2O2 --> CO2 + 2H2O, a mass of 25 g CO2 is produced by reacting methane with excess oxygen. Write the problem to solve for moles of CH4.

.568 mol CH4

In the reaction N2 + 3H2 --> 2NH3, what is the mole ratio of nitrogen to ammonia?

1 mol N2 : 2 mol NH3

Which coefficients correctly balance the formula equation: CaCO3 --> CaO + CO2?

1, 1, 1

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

1, 1, 1

Which coefficients correctly balance the formula equation: NH4NO2 --> N2 + H2O?

1, 1, 2

What is the ratio of cations to anions in a compound of sodium ions (Na+) and carbonate ions?

2:1 ratio

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

2Al + 3CuSO4 --> Al2(SO4)3 + 3Cu

What is the formula for the compound formed by aluminum (III) and the sulfate ion, SO4 (2-) ?

2Al + 3SO4 --> Al2(SO4)3

Write a balanced chemical equation for the following reaction: Mercury (II) Oxide (heated) yields Mercury + Oxygen.

2HgO --> 2Hg + O2

How many mole ratios can be correctly obtained from the chemical equation: 2NO --> N2 + O2

3, N2 : 2NO, O2 : 2NO, N2 : O2

What volume of hydrogen gas is produced if 20.0 mol of Zn are added to excess hydrochloric acid according to the equation Zn + 2HCl --> ZnCl2 + H2 (Assume the density of H2 is .0899 g/L)

448.5 L H2

What is the mole ratio of oxygen to phosphorus(V) oxide in the reaction: P4 + 5O2 --> P4O10?

5 mol O2 : 1 mol P4O10

How many silver atoms can be produced if .00350 g of Cu are reacted with excess AgNO3 according to the equation Cu + 2AgNO3 --> 2Ag + Cu(NO3)2?

6.64 x 10^19 p Ag

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

612.5 g H2SO4

For the reaction, CH4 + 2O2 --> CO2 + 2H2O, calculate the percentage yield of carbon dioxide if 1000g of methane react with excess oxygen to produce 2300 g of carbon dioxide .

83%

For the reaction 2Na + 2H2O --> 2NaOH + H2, calculate the percentage yield if 80 g of water react with excess sodium to produce 4.14 g of hydrogen.

92%

What does the symbol HCO3 represent?

A polyatomic ion

In the unbalanced formula equation CO + O2 --> CO2 + energy, what is energy?

A product

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

Activity series

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

Actual yield

After the first steps in writing an equation, the equation is balanced by doing what?

Adjusting the coefficients so the same number of each kind of atom appears in both sides of the equation

What is an ion with a negative charge?

Anion

Why does the word equation, solid carbon + oxygen gas --> carbon dioxide gas + energy, represent a chemical reaction?

Because there is a chemical change in the reactants as they form one compound

An element in the activity series can replace any element that is located where?

Below it

Write the correct chemical formula for the compound carbon dioxide.

CO2

What is the formula for the compound formed by calcium ions (Ca2+) and chloride ions (Cl-) ?

CaCl2

A chemical reaction has *not* occurred if the products have what?

Changed in total mass

A reaction of hydrocarbon, in which carbon dioxide and water are produced, is classified as a what?

Combustion

What is the metallic ion in the compound CuCl2?

Cu 2+

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

Decomposition

The reaction 2KClO3 --> 2KCl + 3O2 is a what?

Decomposition

Write the word equation for the formula equation: C2H5OH + O2 --> CO2 + H2O + energy

Ethanol + Oxygen --> Carbon Dioxide + Water + energy

The substance not completely used up in a chemical reaction is known as what?

Excess reactant

How must actual yield be determined?

Experiments

Write a balanced chemical equation for the following reaction: Iron plus Copper (I) Nitrate yields Iron (II) Nitrate plus Copper.

Fe + 2CuNO3 --> Fe(NO3)2 + 2CU

After the correct formula for a reactant in an equation has been written, the..

Formula should not be changed

What is the actual yield of a chemical reaction compared to the theoretical yield?

Generally less than the theoretical yield

Write the correct chemical formula for Hydrobromic acid.

HBr

Write the correct chemical formula for Bromic acid.

HBrO3

The *name* of a *polyatomic ion* that contains hydrogen begins with what word/term?

Hydrogen

How do you know when an equation is not balanced?

If t he same number of each kind of atom does not appear in both the products and the reactants

What are the charges of the indium (II) ion and indium (III) ion?

Indium (II) = 2+ Indium (III) = 3+

Name the compound Fe(NO2)2

Iron (II) Nitrite

The substance that restricts the participation of other reactants in a chemical reaction is known as the what?

Limiting reactant

Name the compound Hg2(NO3)2

Mercury (I) Nitrate

The coefficients in a chemical equation represent what?

Mole ratio

A balanced chemical equation allows one to determine the..

Mole ratio of any two substances in the reaction

Write the correct chemical formula for Dinitrogen Monoxide.

N2O

Write the correct chemical formula for the compound trinitrogen monoxide.

N3O

Name the compound Ni(ClO3)2

Nickel (II) Chlorate

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

Not replace metal Y

The products of the reaction, C2H5OH + 3O2 --> 2CO2 + H2O, have the same ____ as the reactants.

Number of atoms

How would oxygen be represented in the formula equation for the reaction of methane and oxygen to yield carbon dioxide and water?

O2 (Br I N Cl H O F)

A comparison of calcium sulfate and calcium sulfite shoes they differ in how many Oxygen atoms?

One

Write a balanced equation for the synthesis of liquid phosphorus trichloride, PCl3, from white phosphorus, P4, and chlorine gas.

P4 + 12Cl --> 4PCL3

What is the formula for the compound formed by lead (II) ions and chromate ions, CrO4 (2-) ?

Pb + CrO4 --> PbCrO4

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

Percentage yield

Name the compound KClO3

Potassium Chlorate

What is an insoluble solid produced by a chemical reaction in solution called?

Precipitate

A chemical equation is balanced when the..

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

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

Single replacement

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

Single-replacement

What type of reaction is Cl2 + 2KBr --> 2KCl + Br2?

Single-replacement

What is the formula for the compound formed by tin (IV) and the chromate ion, CrO4 (2-)

Sn + 2CrO4 --> Sn (CrO4)2

Write the correct chemical name for H2SO4.

Sulfuric Acid

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

Synthesis

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

Synthesis

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

The available amount of each reactant

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

The coefficients

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

The limiting reactant

What is needed to calculate the mass of ammonia gas produced from 2.0 L of nitrogen gas in excess hydrogen gas in the reaction: N2 + 3H2 --> 2NH3?

The mole ratio, and atomic masses of N2 and 2NH3

What does the chemical formula for an ionic compound represent?

The number of atoms in each molecule

Name the compound Sn3(PO4)4

Tin (IV) Phosphate

Write the correct chemical name for P3O2.

Triphosphorus Dioxygen

When does a precipitate form in a double-displacement reaction?

When positive ions combine with negative ions

What can be predicted by using an activity series?

Whether or not an element will replace another

Name the compound Zn3(PO4)2

Zinc Phosphate