CHEMISTRY FINAL- YOON

Terms in this set (48)

Chemical reactions ___
Produce new substances
Everyday equations describe ___
everyday processes
Chemical equations____
describe chemical reactions
A skeleton equation does NOT show which of the following?
the relative amounts of reactants and products
Symbols used in equations, together with the explanations of the symbols, are shown below. Which set is correct?
(aq) dissolved in water
A catalyst is ___
not used up in a reaction
Which of the following is the correct skeleton equation for the reaction that takes place when solid phosphorus combines with oxygen gas to form diphosphorus pentoxide?
P(s) + O2(g) ---> P2O5 (s)
If you rewrite the following word equation as a balanced chemical equation, what will the coefficient and symbol for fluoride be?
3F2
What are the coefficients?
AlCl3 + NaOH ---> Al(OH03 + NaCl
1, 3, 1 ,3
What are the coefficients that will balance this?
N2 + H2 ---> NH3
1, 3, 2
When the equation Fe + Cl2 ---> FeCl3 is balanced, what is the coefficient for Cl2?
3
Which of the following statements is NOT true about what happens in all chemical reactions?
New atoms are formed as products
Chemical equations must be balanced to satisfy ___
the law of conservation of mass
When the equation KClO3(s) ---> KCl(s) + O2(g) is balanced, the coefficient of KClO3 is ___
2
What are the missing coefficients?
Cr(s) + Fe(NO3)2(aq) ---> Fe(s) + Cr(NO3)3(aq)
2,3,3,2
What are the missing coefficients
Al2(SO4)3(aq) + KOH(aq) ---> Al(OH)3(aq) + K2SO4(aq)
1, 6, 2, 3
The product of a combination reaction is Ba(OH)2. If one of the reactants is H2O, what is the other reactant?
BaO
In order for the reaction 2Al + 6HCl --> 2AlCl3 + 3H2 to occur, which of the following must be true?
Al must be above H on the activity series
In a combustion reaction, one of the reactants is ___
oxygen
Which of the following statements is NOT correct?
All chemical reactions can be classified as one of five general types
What are the correct formulas/coefficients?
RbOH + H3PO4 --->
Rb3PO4 + 3H2O
Which of the following statements is NOT true about the decomposition of a simple binary compound?
the products are unpredictable
The complete combustion of which of the following substances produces carbon dioxide and water?
C8H18
Which of the following is the correctly balanced equation for the incomplete combustion of heptene, C7H14?
C7H14 + 7O2 --> 7CO + 7H2O
The reaction 2Fe + 3Cl2 --> 2FeCl3 is an example of which type of reaction?
combination reaction
The equation Mg(s) + 2HCl)aq) --> MgCl2(aq) + H2(g) is an example of which type of reaction?
single-replacement reaction
2C3H7OH + 9O2 --> 6CO2 + 8H2O is an example of what type of reaction?
combustion reaction
A double-replacement reaction takes place when aqueous cobalt(III) chloride reacts with aqueous lithium hydroxide. One of the products of this reaction is ___
Co(OH)3
If 1 egg and 1/3 cup of oil are needed for each bag of brownie mix, how many bags of brownie mix do you need if you want to use up all 3 eggs and 1 cup of oil?
3
What is conserved in the reaction:
H2(g) + Cl2(g) --> 2HCl(g)
mass, moles, molecules, and volume
In every chemical reaction ___
mass and atoms are conserved
In a chemical reaction, the mass of the products ___
is equal to the mass of the reactant
In any chemical reaction, the quantities that are preserved are ____
mass and number of atoms
The first step in most stochiometry problems is to ___
convert given quantities to moles
In the reaction 2CO(g) + O2(g) --> 2CO2(g), what is the ratio of moles of oxygen used to moles of CO2 produced?
1:2
Which of the following is true about the total number of reactants and the total number of products in the reaction below:
C5H12(l) + 8O2(g) --> 5CO2(g) + 6H2O(g)
9 moles chemically change into 11 moles of product
Which of the following is INCORRECT:
2S(s) + 3O2(g) --> 2SO3(g)
2g S + 3g O2 --> 2g SO3
How many moles of aluminum are needed to react completely with 1.2 mol of FeO?
2Al(s) + 3FeO(s) --> 3Fe(s) + Al2O3(s)
0.8 mol
Calculate the number of moles of Al2O3 that are produced when 0.60 mol of Fe is produced in the following equation:
2Al(s) + 3FeO(s) --> 3Fe(s) + Al2O3(s)
0.20 mol
How many moles of glucose, C6H12O6 can be "burned" biologically when 10.0 mol of oxygen is available?
1.67 mol
Hydrogen gas can be produced by reacting aluminum with sulfuric acid. How many moles of sulfuric acid are needed to completely react with 15.0 mol of aluminum?
2Al(s) + 3H2SO4(aq) --> Al2(SO4)3(aq) + 3H2(g)
22.5 mol
Which type of stochiometric calculation does not require the use of the molar mass?
volume-volume problems
The equation below shows the decomposition of lead nitrate. How many grams of oxygen are produced when 11.5g NO2 is formed?
2Pb(NO3)2(s) --> 2PbO(s) + 4NO2(g) + O2(g)
2.00 g
Iron(III) oxide is formed when iron combines with oxygen in the air. How many grams of Fe2O3 are formed when 16.7g of FE reacts completely with oxygen?
4Fe(s) + 3O2(g) --> 2Fe2O3(s)
23.9g
When glucose is consumed it reacts with oxygen in the body to produce carbon dioxide, water, and energy. How many grams of carbon dioxide would be produced if 45g of C6H12O6 completely reacted with oxygen?
66g
Aluminum reacts with sulfuric acid to produce aluminum sulfate and hydrogen gas. How many grams of aluminum sulfate would be formed if 250g H2SO4 completely reacted with aluminum?
2Al(s) + 3H2SO4(aq) --> Al2(SO4)3(aq) + 3H2(g)
290g
Mercury can be obtained by reacting mercury(II) sulfide with calcium oxide. How many grams of calcium oxide are needed to produce 36.0g of HG?
4HgS(s) + 4CaO(s) --> 4Hg(l) + 3CaS(s) + CaSO4
10.1g
How many grams of H3PO4 are produced when 10.0 moles of water react with an excess of P4O10?
P4O10(s) + 6H2O(l) --> 4H3PO4(aq)
653g
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