Chapter 7
In a ________ reaction, two or more elements or compounds form one product
combination
The reaction of carbon with oxygen to produce carbon monoxide is an example of which class of reaction
combination
What is the classification for this reaction SO3 + H2O --> H2SO4
combination
The following reaction is an example of a _______ reaction C5H8 + 7O2 --> 5CO2 + 4H2O
combustion
The _________ is the energy difference between reactants and products in a chemical reaction
heat of reaction
If the reaction shown below is exothermic, the energy level of the reactants is ________. H2 + O2 → 2H2O
higher than that of the products
In an oxidization-reduction reaction, the substance oxidized always
loses electrons
What is the classification for this unbalanced reaction Fe + HCl --> FeCl3 + H2
single replacement
A chemical equation is balanced when
the number of atoms of each element is the same in reactants and products
In any balanced chemical equation, the number of each type of atom on both sides of the equation is
the same
3.00 moles of NO2 have a mass of
138g
What is the molar mass of copper (II) sulfate, CuSO4
159.6 g/mole
What is the molar mass of sodium phosphate, Na3PO4
163.9 g/mole
How many grams are NO are required to produce 145g of N2 in the following reaction 4NH3 + 6NO --> 5N2 + 6H2O
186g
In this reaction what is the correct coefficient for sodium chloride Pb(NO3)2 + ? NaCl --> PbCl2 + ? NaNo3
2
Gven the following equation, what is the correct form of the conversion factor needed to convert the number of moles of O2 to the number of moles of Fe2O3 produced 4Fe + 3O2 --> 2Fe2O3
2 moles Fe2O3/3 moles O2
One mole of copper (II) sulfate, CuSO4, contains_________ O atoms
2.41x10 to the 24th
0.400 mole of sucrose, C12H22O11, contains __________ C atoms
2.89x10 to the 24th
One mole of neon atoms has a mass of
20.18 g
How many grams of K2SO4 are there in 0.123 mole of K2SO4
21.4g
What is the molar mass of Mg3(PO4)2, a substance formerly used in medicine as an antacid
262.9 g/mole
Which of the following gives the balanced equation for this reaction K3PO4 + Ca(NO3)2 --> Ca3(PO4)2 + KNO3
2K3PO4 + 3Ca(NO3)2 --> Ca3(PO4)2 + 6KNO3
For the following reaction, what is the correct coefficient for H2 Fe + HCl --> FeCl3 + H2
3
What is the coefficient of hydrogen, H2, when the following equation is balanced Al + H2SO4 --> Al2(SO4)3 + ? H2
3
The molar mass of potassium is
39.10 g/mole
One mole of copper (II) sulfate, CuSO4, contains _________ moles of O
4
When 4 moles of aluminum are allowed to react with an excess of chlorine gas, Cl2, how many moles of aluminum chloride are produced 2Al + 3Cl2 --> 2AlCl3
4 moles
How many moles of water are present in 75.0 g of H2O
4.16 moles
0.400 mole of sucrose, C12H22O11, contains _________ moles of C
4.80
One mole of particles of any substance contains how many particles?
6.02x10 to the 23rd particles
Find the mass of AlCl3 that is produced when 25.0 g of Al2O3 reacts with HCl according to the following equation
65.3g
The molar mass of calcium hydroxide is, Ca(OH)2 is
74.10 g/mole
The molar mass of C3H8O2 is
76.09 g/mole
How many grams of Fe2O3 are there in 5.00 mole of Fe2O3
79.9g
In the reaction of silver nitrate with sodium chloride, how many grams of silver chloride will be produced from 100. g of silver nitrate when it is mixed with an excess of sodium chloride? The equation for the reaction is below. AgNO3 + NaCl → AgCl + NaNO3
84.4 g
How many grams of CO2 are produced from 125 g of O2 and excess CH4 CH4 + 202 --> CO2 + 2H2O
85.9g
The _______ is the minimum energy needed for a chemical reaction to begin
activation energy
How many moles of carbon atoms are there in 0.500 mole of C2H6
1.00 mole
How many moles of K2SO4 are in 15.0 g of K2SO4
0.0861 moles
How many grams of hydrogen are needed to produce 1.80 g of water according to this equation 2H2 + O2 --> 2H2O
0.201 g
0.100 mole of lithium has a mass of
0.694 g
Which of the following correctly gives the correct coefficients for the reaction below N2H4 + H2O2 --> N2 + H2O
1, 2, 1, 4
What is oxidized and what is reduced in the following reaction 2Al + 3Br2 --> 2AlBr3
Al is oxidized and Br2 is reduced
Avogrado's number is the number of grams in a mole
False
The molar mass of chlorine has is 35.45 g/mole
False
The molar mass of copper (II) chloride is 134.5 g/mole
False
The molar mass of silver is 47 g/mole
False
Avogadro's number is the number of
Particles in 1 mole of a substance
The mass of 0.352 mole of sodium chloride is 20.6 g
True
The molar mass of magnesium is 24.31 g/mole
True
The molar mass of water is 18.02 g
True
The following reaction takes place when an electric current is passed through water. It is an example of a __________ reaction
decomposition
Any reaction that absorbs 150 kcal of energy can be classified as ________.
endothermic
A reaction that releases energy as it occurs is classified as a(n)
exothermic reaction
What type of reaction is CH4 + 2O2 --> CO2 + 2H2O + 218 kcal
exothermic reaction
In an oxidization-reduction reaction, the substance reduced always
gain electrons