Chemistry Exam #4 Ch. 7&8 #'s 1-59
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?
combination
In an oxidation-reduction reaction, the substance oxidized always ________.
loses electrons
Avogadro's number is the number of ________.
particles in 1 mole of a substance
The following reaction is an example of a ________ reaction.
single replacement
What is the classification for this unbalanced reaction?
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
C5H12+ ? O2 ? CO2 + ? H2O
using for the next questions
In this reaction, what is the substance oxidized?
zinc
How many grams of MgO are produced when 40.0 grams of O2 react completely with Mg?
101 g
When 2 moles of Mg3N2 are allowed to react, how many moles of H2O also react?
12 moles
3.00 moles of NO2 have a mass of ________.
138 g
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
In the following reaction, what is the correct coefficient for aluminum chloride?
2
In this reaction, what is the correct coefficient for sodium chloride?
2
Given 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?
2 moles Fe2O3/3 moles O2
What is the correct form of the conversion factor needed to convert the number of moles of H2O to the number of moles of NH3 produced?
2 moles NH3/6 moles H2O
The number of moles of oxygen gas needed to react with 4.0 moles of Mg is ________.
2.0 moles
One mole of copper(II) sulfate, CuSO4, contains ________ O atoms
2.41 × 1024
0.400 mole of sucrose, C12H22O11, contains ________ C atoms
2.89 × 1024
One mole of neon atoms has a mass of ________.
20.18 g
How many grams of magnesium are needed to react with 16 g of O2?
24 g
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?
2K3PO4 + 3Ca(NO3)2 Ca3(PO4)2 + 6KNO3
For the following reaction, what is the correct coefficient for the H2?
3
What is the coefficient of hydrogen,H2, when the following equation is balanced?
3
What is the molar mass of sucrose (C12H22O11)?
342.3 g/mole
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?
4 moles
One mole of helium gas weighs ________.
4.003 g
How many moles of water, H2O, are present in 75.0 g H2O?
4.16 moles
What is the coefficient for carbon dioxide in the balanced equation?
5
What is the coefficient for water in the balanced equation?
6
In the reaction of nitrogen gas, N2, with hydrogen gas, H2, to form ammonia gas, NH3, how many moles of hydrogen are needed to react with two moles of nitrogen?
6 moles
0.400 mole of sucrose, C12H22O11, contains ________ moles of C.
6.02 × 1023
One mole of particles of any substance contains how many particles?
6.02 × 1023 particles
How many grams of glucose (C6H12O6) are in 3.55 moles of glucose?
640. g
What coefficient is placed in front of O2to complete the balancing of the following equation?
7
The molar mass of calcium hydroxide, Ca(OH)2, is ________.
74.10 g/mole
Calculate the molar mass of potassium chloride, KCl.
74.55 g/mole
The molar mass of C3H8O2 is ________.
76.09 g/mole
How many grams of Fe2O3 are there in 0.500 mole of Fe2O3?
79.9 g
What is the coefficient for oxygen in the balanced equation?
8
4.00 moles of sodium have a mass of ________.
92.0 g
Calculate the molar mass of magnesium chloride, MgCl2.
95.21 g/mole
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?
0.201 g
The number of moles of MgO produced when 0.20 mole of O2 reacts completely is ________.
0.40 mole
0.100 mole of lithium has a mass of ________.
0.694 g
In this reaction, what is the coefficient for calcium oxide?
1
Which of the following correctly gives the correct coefficients for the reaction below?
1, 2, 1, 4
What is oxidized and what is reduced in the following reaction?
Al is oxidized and Br2 is reduced.
Which of the following is an oxidation-reduction reaction?
N2 + O2 2NO
2Mg + O2 2MgO
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Mg3N2 + 6H2O 3Mg(OH)2 + 2NH3
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The following reaction takes place when an electric current is passed through water. It is an example of a ________ reaction.
decomposition
In an oxidation-reduction reaction, the substance reduced always ________.
gains electrons