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Moles And Stoichiometry
Test Description: Unit 4, Chs 10 11 Review
Instructions: Answer all questions to get your test result.
1) How many hydrogen atoms are in 5 molecules of isopropyl alcohol, C3H7O?
A
35 x (6.02 x 10^23)
B
3
C
35
D
5
2) The lowest whole-number ratio of the elements in a compound is called the:
A
molecular formula
B
structural formula
C
empirical formula
D
molar formula
3) In every chemical reaction,
A
moles and liters are conserved
B
moles and molecules are conserved
C
mass and atoms are conserved
D
mass and molecules are conserved
4) In the reaction 2CO(g) + O2(g) yields 2CO2(g), what is the ratio of moles of oxygen used to moles of CO2 produced?
A
2:2
B
2:1
C
1:1
D
1:2
5) In a chemical reaction, the mass of the products. . .
A
is greater than the mass of the reactants
B
is equal to the mass of the reactants
C
is less than the mass of the reactants
D
has no relationship to the mass of the reactants
6) When an equation is used to calculate the amount of product that will form during a reaction, the value obtained is called the . . .
A
actual yield
B
percent yield
C
theoretical yield
D
minimum yield
7) When two substances react to form products, the reactant which is used up is called the . . .
A
determining reactant
B
excess reactant
C
limiting reactant
D
maximum reactant
8) Any reactant that remains after a reaction is complete is called . . .
A
determining reactant
B
minimum reactant
C
limiting reactant
D
excess reactant
9) The SI unit for the amount of a substance is the _______. (Also equal to Avogadro's number of particles.)
A
molecule
B
mole
C
milliliter
D
gram
10) The representative particles of sulfur dioxide are . . .
A
formula units
B
atoms
C
ions
D
molecules
*select an answer for all questions
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