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- 1. Multiple Choice
Which of the following represents the net ionic equation for the precipitation reaction between sodium carbonate and magnesium sulfate?
Na2CO3 + MgSO4 --> MgCO3 + Na2SO4
2Na+ + CO3-2 + Mg+2 + SO4-2 --> Mg+2 + CO3-2 + 2Na+ + SO4-2
2Na+ + SO4-2 --> Na2SO4
CO3-2 + Mg+2 --> MgCO3
- 2. Multiple Choice
Which of the following represents the net ionic equation for the precipitation reaction between sodium phosphate and lead (II) acetate?
2Na3PO4+ 3Pb(C2H3O2)2 --> Pb3(PO4)2 + 6NaC2H3O2
6Na+ + 2PO4-3 + 3Pb+2 + 3C2H3O2-1 --> Pb3(PO4)2 + 6NaC2H3O2
2PO4-3 + 3Pb+2 --> Pb3(PO4)2
Na+ + C2H3O2-1 --> NaC2H3O2
- 3. Multiple Choice
Chemical or physical change? 2 H2O(l) + O2(g) → 2 H2O2(l)
Chemical
Physical
- 4. Multiple Choice
Chemical or physical change? H2O(l) → H2O(g)
Chemical
Physical
- 5. Multiple Choice
Physical changes occur when...
bonds are broken and formed
a different phase appears in the product side
- 6. Multiple Choice
Chemical changes occur when...
bonds are broken and formed
a different phase appears in the product side
- 7. Multiple Choice
Which observation suggests a chemical change occurred?
Change in total volume
Change in temperature
Change in total pressure
- 8. Multiple Choice
Which observation suggests a chemical change occurred?
The mass stays constant
The solution stays colorless
A precipitate forms
- 9. Multiple Choice
Which observation suggests a physical change occurred?
The shape of an object changed
Color change
Clear solutions turn cloudy
- 10. Multiple Choice
Boiling is an example of a __________
Physical change because bonds are broken
Physical change because IMFs are overcome
Chemical change because bonds are broken
Chemical change because IMFs are overcome
- 11. Multiple Choice
What represents the net ionic equation for the reaction that occurs when the solutions of sodium carbonate and calcium nitrate are combined?
Na2CO3 + Ca(NO3)2 --> 2NaNO3 + CaCO3
2Na+ + CO3-2 + Ca+2 + 2NO3-1 --> 2NaNO3 + CaCO3
Na+ + NO3-1 --> NaNO3
CO3-2 + Ca+2 --> CaCO3
- 12. Multiple Choice
A precipitation reaction must...
Have a solid ionic product from aqueous reactants
Have only gaseous products from gaseous reactants
Have only aqueous products from aqueous reactants
- 13. Multiple Choice
In order to be considered an oxidation-reduction reaction,
a precipitate must form
the oxidation number of two species must change
the pH must change
Electrons must be transferred
Protons (H+) must be transferred
- 14. Multiple Choice
In order to be considered an acid-base reaction,
a precipitate must form
the oxidation number of two species must change
one or more protons must be transfered
- 15. Multiple Choice
In a combustion reaction,
oxygen must be a reactant and carbon dioxide and water are products
carbon dioxide and water are reactants and oxygen must be a product
- 16. Multiple Choice
In a redox reaction, electrons are
transferred from the species that's reduced to the species that's oxidized
transferred from the species that's oxidized to the species that's reduced
- 17. Multiple Choice
An acid is defined as a...
proton donor
proton acceptor
- 18. Multiple Choice
An base is defined as a...
proton donor
proton acceptor
- 19. Multiple Choice
In this example, H+ + H2O -> H3O+ the water acts as a(n)
acid donating a proton
acid accepting a proton
base donating a proton
base accepting a proton
- 20. Multiple Choice
In the following example, CH3CH2COOH(aq) + H2O(l) ⇄ CH3CH2COO-(aq) + H3O+(aq) what would be considered a conjugate acid-base pair?
CH3CH2COOH(aq) and H2O(l)
CH3CH2COO-(aq) and H3O+(aq)
CH3CH2COO-(aq) and CH3CH2COOH(aq)
CH3CH2COOH(aq) and H3O+(aq)
- 21. Multiple Choice
Which of the following represent a Brønsted-Lowry conjugate acid-base pair?
HF and H2O
NaOH and H2O
HF and NaOH
HF and F-
- 22. Multiple Choice
Which of the following represent a Brønsted-Lowry conjugate acid-base pair
HCN and H2O
H3O+ and CN-
CN- and H+
HCN and CN-
- 23. Multiple Choice
Given this general acid-base reaction HA + B- --> A- + HB, if K>0, which acid is stronger? (K > 0, products favored, dissociation of reactants) (K<0, reactants favored, dissociation of products)
HA
HB
- 24. Multiple Choice
Given this general acid-base reaction HA + B- --> A- + HB, if K<0, which base is stronger?
A-
B-
- 25. Multiple Choice
Given the following: NH3(aq) + HCl(aq) ⇄ NH4+(aq) + Cl-(aq)
The Brønsted-Lowry acids in the reaction represented above are
NH3(aq) and NH4+(aq)
HCl(aq) and NH4+(aq)
HCl(aq) and Cl-(aq)
NH3(aq) and HCl(aq)
- 26. Multiple Choice
The half-reactions for the oxidation-reduction reaction between Al(s) and Zn2+(aq) are represented above. Based on the half-reactions, what is the coefficient for Al(s)
if the equation for the oxidation-reduction reaction is balanced with the smallest whole-number coefficients?
1
2
3
4
- 27. Multiple Choice
Which of the following is the balanced net ionic equation for an oxidation-reduction reaction between Ag+ (aq) and Ni(s) based on the half-reactions represented above?
Ag+(aq )+ Ni(s) →Ag(s) + Ni2+(aq)
2Ag+ (aq) + Ni(s) → Ag(s) + 2Ni2+(aq)
Ag+(aq) + 2Ni(s) → Ag(s) + 2Ni2+ (aq)
2Ag+(aq) + Ni(s) → 2Ag(s) + Ni2+(aq)
- 28. Multiple Choice
When a student adds 30.0 mL of 1.00 M HCl to 0.56 g of powdered Fe, a reaction occurs according to the equation above. When the reaction is complete at 273 K and 1.0 atm, which of the following is true?
HCl is in excess, and 0.100 mol of HCl remains unreacted.
HCl is in excess, and 0.020 mol of HCl remains unreacted.
0.015 mol of FeCl2 has been produced.
0.22 L of H2 has been produced.
- 29. Multiple Choice
Reaction 2 occurs when an excess of 6 M HCl(aq) solution is added to 100. mL of NaOCL(aq) of unknown concentration. If the reaction goes to completion and 0.010 mol of Cl2(g) is produced, then what was the molarity of the NaOCL(aq) solution?
0.0010 M
0.010 M
0.10 M
1.0 M
- 30. Multiple Choice
Potassium hydrogen phthalate, KHP, is used as a primary standard for determining the concentration of a solution of NaOH by titration. If the KHP has not been dried before weighing, the calculated molarity of the NaOH would be
higher than the actual value, since water is included in the apparent mass of KHP
higher than the actual value, since the presence of water requires a larger volume of titrant
lower than the actual value, since NaOH absorbs water
unaffected, since KHP is a strong acid
unaffected, since water is routinely added before the titration
- 31. Multiple Choice
2 Al(s) + 6 HCl(aq) → 2 AlCl3(aq) + 3 H2(g) According to the reaction, about how many grams of aluminum (atomic mass 27 g) are necessary to produce 0.50 mol of hydrogen gas at STP?
1.0 g
9.0 g
14 g
27 g
56 g
- 32. Open Ended
A solution of 0.100 M HCl and a solution of 0.100 M NaOH are prepared. A 40.0 mL sample of one of the solutions is added to a beaker and then titrated with the other solution. A pH electrode is used to obtain the data that are plotted in the titration curve shown above.
A. Identify the solution that was initially added to the beaker. Explain your reasoning. B. On the titration curve above, identify the point that corresponds to the equivalence point. C. At the equivalence point, how many moles of titrant have been added?
- 33. Multiple Choice
Which of the following represents the oxidation half-reaction for the reaction shown above?
Choose 1 answer:
- 34. Multiple Choice
Which element is oxidized in the reaction represented above, and how does its oxidation number change?
Choose 1 answer:
Mn; its oxidation number changes from -1 to +2
Mn; its oxidation number changes from +7 to +2
S; its oxidation number changes from -1 to -2
S; its oxidation number changes from +4 to +6
- 35. Multiple Choice
When the half-reactions listed above are combined into a balanced chemical equation, the ratio of the coefficients HS-(aq) : ClO3-(aq) is
1:1
1:3
3:1
3:2
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