Chemistry Final Exam
In an equation, the symbol for a substance in water solution is followed by?
(aq)
For the reaction Pb(NO3)2 + 2Kl = Pbl2 + 2KNO3, how many moles of lead iodide are produced from 300 g of potassium iodide?
0.903 mol
In the reaction Ca + Cl2 = CaCl2, what is the mole ratio of chlorine to calcium chloride?
1 : 1
In the reaction Zn + H2SO4 = ZnSO4 + H2, what is the mole ratio of zinc to sulfuric acid?
1 : 1
In the reaction 2H2 + O2 = 2H2O, what is the mole ratio of oxygen to water?
1 : 2
In the reaction N2 + 3H2 = 2NH3, what is the mole ratio of nitrogen to ammonia?
1 : 2
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
For the reaction 3Fe + 4H2O = Fe3O4 + 4H2, how many moles of iron oxide are produced from 500 g of iron?
3 mol
The haber process for producing ammonia commercially is represented by the equation N2 (g) + 3H2 (g) = 2NH3 (g). To completely convert 9.0 mol of hydrogen gas to ammonia gas, how many moles of nitrogen gas are required?
3.0 mols
For the reaction SO3 + H2O =H2SO4, how many grams of sulfur trioxide are required to produce 4.00 mol of sulfuric acid?
320 g
In the reaction 2Al2O3 = 4Al + 3O2, what is the mole ratio of aluminum to oxygen?
4 : 3
For the reaction 2Na + 2H2O = 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 equation 2KClO3 = 2KCl + 3O2, how many moles of oxygen are produced when 3.0mols of KClO3 decompose completely?
4.5 mols
For the reaction 2KlO3 = 2KCl + 3O2, how many moles of potassium chlorate are required to produce 250 g of oxygen?
5.2 mol
For the reaction 2Fe + O2 = 2FeO, how many grams of iron oxide are produced from 8.00 mol of iron?
574 g
For the reaction 2HNO3 + Mg(OH)2 = Mg(NO3)2 + 2H2O, how many grams of magnesium nitrate are produced from 8.00 mol of nitric acid?
592 g
For the reaction 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 AgNO3 + NaCl = NaNO3 + AgCl, how many moles of silver chloride, AgCl, are produced from 7 mol of silver nitrate AgNO3?
7.0 mol
For the reaction 2NA + Cl2 = 2NaCl, how many grams of chlorine gas are required to react completely with 2.00 mol of sodium?
70.9 g
For the reaction 2Na + 2H2O = 2NaOH + H2, calculate the percent yield if 200 g of chlorine react with excess sodium to produce 240 g of sodium chloride?
72.8 %
For the reaction HCl + NaOH = NaCl + H2O, how many moles of hydrochloric acid are required to produce 150 g of water?
8.32 mol
For the reaction 2Na + Cl2 = 2NaCl, how many grams of sodium chloride can be produced from 500 g each of sodium and chlorine?
825 g
For the reaction CH4 + 2O2 = 2H2O + CO2, Calculate the percent yield of carbon dioxide if 1000 g of methane react with excess oxygen to produce 2300 g of carbon dioxide?
83.88 %
For the reaction Mg + 2HCl = H2 + MgCl2, calculate the percent yield of magnesium chloride if 100 g of magnesium react with excess hydrochloric acid to yield 330 g of magnesium chloride?
84.2 %
When the equation Fe3O4 + Al = Al2O3 + Fe is correctly balanced, what is the coefficient of Fe?
9
In the reaction N2 + 3H2 = 2NH3, how many moles of nitrogen are required to produce 18 mol of ammonia?
9.0 mol
For the reaction Cl2 + 2KBr = 2KCl + Br2 , calculate the percent yield if 200 g of chlorine react with excess potassium bromide to produce 410 g of bromine?
91.0 %
For the reaction 2Na + 2H2O = 2NaOH + H2, calculate the percent yield if 80 g of water react with excess sodium to produce 4.14 g of hydrogen?
92 %
For the reaction SO3 + H2O = H2SO4, calculate the percent yield if 500g of sulfur trioxide react with excess water to produce 575 g of sulfuric acid?
93.9 %
What is the small whole number that appears in front of a formula in a chemical equation?
A Coefficient
A chemical formula written over the arrow in a chemical equation signifies?
A catalyst for the reaction
A solid produced by a chemical reaction in solution that separates from the solution is called?
A precipitate
After the first steps in writing an equation, the equation is balanced by?
Adjusting coefficients to the smallest whole number ratio
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
Which of the following is a formula equation for the formation of carbon dioxide from carbon and oxygen?
C + O2= CO2
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
In writing an equation that produces hydrogen gas, the correct representation of hydrogen gas is?
H2
Which word equation represents the reaction that produces water from hydrogen and oxygen?
Hydrogen plus oxygen yields water
Knowledge about what products are produced in a chemical reaction is obtained by?
Laboratory Analysis
For the formula equation 2Mg + O2 = 2MgO, the word equation would begin?
Magnesium plus Oxygen
Oxides of active metals, such as CaO, react with water to produce?
Metal hydroxides
Magnesium Bromide + Chlorine Yield
Mg(Cl)2 and Br2
Predict the product of the following reaction: MgO + CO2 =?
MgCO3
The formulas for the products of the reaction between sodium hydroxide and sulfuric acid are?
Na2SO4 and H2O
How would oxygen be represented in the formula equation for the reaction of methane and oxygen to yield carbon dioxide and water?
O2
What is the balanced equation for the combustion of sulfur?
S (s) + O2 (g) = SO2(g)
A chemical equation is balanced when the
Same number of each kind of atom appears in the reactants and in the products
Which of the following would NOT be studied in the branch of chemistry called stoichiometry?
The amount of energy required to break the ionic bonds in calcium fluoride
After the correct formula for a reactant in an equation has been written, the?
The formula should not be changed
Which of the following would be investigated in reaction stoichiometry?
The mass of potassium required to produce a known mass of potassium chloride
A chemical reaction has NOT occurred if the products have?
The same chemical properties as the reactants
The complete balanced equation for the reaction between zinc hydroxide and acetic acid is?
Zn(OH)2 + 2CH3COOH = Zn(CH3COO)2 + 2H2O
An insoluble gas that forms in a double replacement reaction in aqueous solution?
bubbles out of solution
If one knows the mole ratio of a reactant and the product in a chemical reaction, one can?
calculate the mass of the product produced from a known mass of reactant
When heated, a metal carbonate decomposes into a metal oxide and?
carbon dioxide
A determination of the masses and number of moles of sulfur and oxygen in the compound sulfur dioxide?
composition stoichiometry
What is the study of the mass relationships of elements in compounds?
composition stoichiometry
In what kind of reaction does a single compound produce two or more simpler substances?
decomposition Reaction
The equation AX= A+X is the general equation for a?
decomposition reaction
The reaction 2HgO (s) = 2Hg (l) + O2 (g) is a?
decomposition reaction
The reaction 2KClO3 (s) = 2KCl (s) + 3O2 (g) is a?
decomposition reaction
The equation AX + BY = AY + BX is the general equation for?
double replacement reaction
The reaction Pb(NO3)2 (aq) + 2Kl (aq) = O2 (g) is a?
double replacement reaction
The decomposition of a substance by an electric current is called?
electrolysis
Each of the four types of reaction stoichiometry problems requires using a?
mole ratio
In a chemical reaction wA + xB = yC + zD, a comparison of the number of moles of A to the number of moles of C would be a?
mole ratio
If one knows the mass and the molar mass of reactant A and the molar mass of product D in a chemical reaction, one can determine the mass of product D produced by using the?
mole ratio of D to A from the chemical equation
A balanced chemical equation allows one to determine the?
mole ratio of any two substances in the reaction
In one type of synthesis reaction an element combines with oxygen to yield a?
oxide
A precipitate forms in a double replacement reaction when?
positive Ions combine with negative ions
What is the study of the mass relationships among reactants and products in a chemical reaction?
reaction stoichiometry
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?
salt
In what kind of reaction does one element replace a similar element in a compound?
single replacement reaction
The equation A + BX = AX + B is the general equation for a?
single replacement reaction
The reaction Cl2 (g) + 2KBr (aq) = 2KCl (aq) + Br2 (l) is a?
single replacement reaction
The reaction Mg (s) + 2HCl (aq) = H2 (g) + MgCl2 (aq) is a?
single replacement reaction
When sodium chlorate (NaClO3) decomposes, the products are?
sodium chloride and oxygen
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
In what kind of reaction do the ions of two compounds exchange places in aqueous solutions to form two new compounds?
synthesis reaction
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?
synthesis reaction
The reaction 2MG (s) + O2 (g) = 2MgO (s) is a?
synthesis reaction
In a chemical reaction wA + xB = yC + zD, if one knows the mass of A and the molar masses of A, B, C, and D, one can determine?
the mass of any of the reactants or products
When a binary compound decomposes, what is produced?
two elements
In a double replacement reaction, hydrogen chloride and sodium hydroxide react to produce sodium chloride. Another product is?
water
For the reaction Cl2 + 2KBr = 2KCl + Br2, how many moles of potassium chloride are produced from 119 g of potassium bromide?
1.00 mol
For the reaction 2H2 + O2 = 2H2O, how many grams of water are produced from 6.00 mol of hydrogen?
108 g
For the reaction 2H2 + O2 = 2H2O, how many moles of water can be produced from 6.0 mol of oxygen?
12 mol
For the reaction 2Na + 2H2O = 2NaOH + H2, how many grams of sodium hydroxide are produced from 3.0 mol of water?
120 g
For the reaction 2Zn + O2 = 2ZnO, how many grams of zinc oxide can be produced from 100 g each of zinc and oxygen?
124 g
For the reaction Cl2 + 2KBr = 2KCl + Br2, how many grams of potassium chloride can be produced from 300 g each of chlorine and potassium bromide?
188 g
In the reaction C + 2H2 = CH4, what is the mole ratio of hydrogen to methane?
2 : 1
In the reaction N2 + 3H2 = 2NH3, what is the mole ratio of hydrogen to ammonia?
2 : 1
For the reaction C + 2H2 = CH4, how many moles of hydrogen are required to produce 10 mol of methane, CH4?
20 mol
For the reaction SO3 + H2O = H2SO4, how many grams of sulfuric acid can be produced from 200 g of sulfur trioxide and 100 g of water?
245 g
What is the balanced equation when aluminum reacts with copper (II) sulfate?
2Al + 3CuSO4 = Al2(SO4)3 + 3Cu
Which equation is not balanced?
2H2 + O2 = H2O
