Chemistry 51 - Fundamentals of Chemistry » Fall 2021 » Chapter 5 Homework
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Question #1
The equation CH4 + 2O2 CO2 + 2H2O is balanced.
A.
TRUE
B.
FALSE
Question #2
The equation Fe + O2 2Fe2O3 can be balanced by putting coefficients of Fe and O2 as 4 and 3 respectively.
A.
TRUE
B.
FALSE
Question #3
Decomposition reactions have a single substance as products.
A.
FALSE
B.
TRUE
Question #4
NaOH + HCl NaCl + H2O is an example of a redox reaction.
A.
FALSE
B.
TRUE
Question #5
In the chemical equation KMnO4 + 8HCl + 5FeCl2 → 5FeCl3 + MnCl2 + 4H2O + KCl, 16 moles of HCl reacts to form 10 moles of H2O.
A.
FALSE
B.
TRUE
Question #6
What does the law of conservation of matter mean in chemistry?
A.
The number of atoms of an element remains the same before and after a chemical change.
B.
Atoms change during a chemical reaction but the overall number of molecules is unchanged.
C.
The types of compounds cannot change after a chemical change.
D.
The state of the matter should remain the same throughout the reaction.
E.
The total number of molecules of reactants should equal the number of molecules of the products.
Question #7
Which of the following is the most accurate equation for the formation of sodium chloride?
A.
2Na + Cl2 → 2NaCl
B.
Na + Cl → NaCl
C.
2Na + Cl2 → NaCl
D.
Na2 + Cl2 → 2NaCl
E.
Na + Cl2 NaCl →
Question #8
One important aspect of balancing chemical equations is that you are NOT allowed to change:
A.
the phase labels on the substances.
B.
the number of molecules of products.
C.
the temperature and pressure of the reaction.
D.
the formulas of the substances.
E.
the number of molecules of reactants.
Question #9
In the reaction 3Al(s) + 8HNO3(aq) XAl(NO3)2(aq) + 2NO(g) + 4H2O(ℓ), X is equal to _____.
A.
1
B.
5
C.
3
D.
8
E.
2
Question #10
In the reaction below, how many molecules of water can be made from 24 molecules of C6H12O6? C6H12O6 + 6O2 6H2O + 6CO2
A.
44
B.
6
C.
228
D.
38
E.
144
Question #11
Consider the reaction: Au(s) + 3HNO3(aq) + 4HCl(aq) HAuCl4(aq) + 3NO2(g) + 3H2O(ℓ) How many Au atoms will react with 996 molecules of HCl?
A.
336
B.
996
C.
1992
D.
498
E.
249
Question #12
What type of reaction is C6H12O6 + 6O2 6H2O + 6CO2?
A.
Decomposition
B.
Combination
C.
Redox
D.
Substitution
E.
Combustion
Question #13
Which of the following is not a redox reaction?
A.
CH2S + 6 F2 → CF4 + 2 HF + SF6
B.
2 KCl(s) → 2 K(s) + Cl2(g)
C.
2N2O5 (g) → O2 (g) + 4NO2 (g)
D.
2Al (s) + 3Br2 (g) → 2AlBr3 (s)
E.
HBr + NaOH → H2O + NaBr
Question #14
In the balanced redox equation Au(s) + 3HNO3(aq) + 4HCl(aq) HAuCl4(aq) + 3NO2(g) + 3H2O(ℓ) what substance is acting as the oxidizing agent?
A.
H2O(ℓ)
B.
HCl(aq)
C.
HNO3(aq)
D.
Au(s)
E.
HAuCl4(aq)
Question #15
When C2H5OH is oxidized, it forms _____.
A.
HCHO
B.
CH3CHO
C.
CH2=CH2
D.
C2H6 + H2O
E.
CH2OH
Question #16
In science, a general statement that explains a large number of observations is known as a(n) _______.
A.
reaction
B.
law
C.
theory
D.
hypothesis
Question #17
In the equation 6CO2 + 6H2O C6H12O6 + 6O2, _______ is the number of molecules of water needed to produce 12 molecules of oxygen.
A.
12
B.
4
C.
2
D.
10
Question #18
The equation H2SO4 + KOH K2SO4 + H2O can be balanced by changing the coefficient of KOH to _______.
A.
1
B.
6
C.
4
D.
2
Question #19
_______ is the term used to refer to the loss of electrons during a chemical reaction.
A.
Oxidation
B.
Redox
C.
Combustion
D.
Precipitation
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