9.1: Questions

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For each of the following test items, select the option that you think is the correct one.

Each response below lists an ion by name and by chemical formula. Also,each ion is classified as monatomic or polyatomic and as a cation or anion.Which particular option is incorrect?
1. carbonate, CO₃^2-, polyatomic anion.
2. ammonium, NH₄ ⁺, polyatomic cation.
3. magnesium, Mg²⁺, monatomic cation.
4. hydroxide, OH^-, monatomic anion.
5. sulfite, SO₃^2-, polyatomic anion.
Equal number of moles of different compounds
1. May or may not have the same number of atoms
2. Have the same number of molecules
3. Have equal weights
4. Have the same number of atom
5. A & B
What do you understand by the term “molecular mass of a molecule”?
1. The summation of atomic masses, in grams, of all the atoms in the mo- lecule.
2. The mass, in grams of the molecule.
3. The gram molecular weight of a substance.
4. The mass, in grams of a substance.
5. The mass, in grams of the heaviest atom of the molecule
Calculate the molecular mass of NaCl?
1. 58
2. 23
3. 35
4. 28
5. 51
All of the substances listed below are fertilizers that contribute nitrogen to the soil. Which of these is the richest source of nitrogen on a mass perentage basis?
1. Urea, (NH₂)₂CO
2. Ammonium nitrate, NH₄NO₃
3. Guanidine, HNC(NH₂)₂
4. Ammonia, NH₃
5. Potassium nitrate, KNO₃
What do 2.4 moles of CO and CO₂ have in common?
1. same mass
2. contain the same mass of carbon and oxygen
3. contain the same mass of oxygen
4. contain the same number of molecules
5. contain the same number of total atoms
Which of the following equations best represents the reaction shown in the diagram above? This can be answered by simple elimination.
1. 8A + 4B → C + D
2. 4A + 8B → 4C + 4D
3. 2A + B →C + D
4. 4A + 2B → 4C + 4D
5. 2A + 4B → C + D
Which of the following can be used to measure a more accurate volume of a liquid?
1. Beaker
2. Graduated cylinder
3. Burrette
4. Bottle
5. All
How can one prepare 750 mL solution of 0.5 M H2SO4, from 2.5 M H2SO4stock solution?
1. by mixing 250 mL of the stock solution with 500 mL of water
2. by mixing 150 mL of the stock solution with 600 mL of water
3. by mixing 600 mL of the stock solution with 150 mL of water
4. by mixing 375 mL of the stock solution with 375 mL of water
5. none
If the concentration of H+ ions in an aqueous solution is 2.5 x 10-4 then,
1. its pH is less than 7
2. the solution is acidic
3. its pOH is greater than 7
4. its OH- concentration is less than the concentration of OH- in neutral solution
5. All
What do you understand by the term “Quantitative analysis”?
1. Involves determining the individual constituents of a given sample.
2. Involves the determination of the relative or absolute amount of an analytein a given sample
3. Involves the addition of measured volume of a known concentration of reagent into a solution of the substance to be determined (analyte).
4. Involves determining the level of purity of an analyte.
5. Involves determining the quality of a sample.
Which of the following statements does not appropriately describe a stage in a titration process?
1. Before equivalence point is reached, the volume of a reagent added to the analyte does not make the reaction complete (when there is excess of analyte).
2. At equivalence point the reagent added is the amount that is chemically equivalent to the amount of substance being determined (analyte).
3. After equivalence point, the amount of reagent added is higher than the amount of substance being determined.
4. After equivalence point, the amount of reagent added cannot be higher than the amount of substance being determined.
5. At the beginning of a titration, the number of moles of the reagent added is always less than that of the analyte present (when there is excess analyte).
Which of the following is correct about titration of a polyprotic weak acid such as orthophosphoric acid (H₃PO₄) with a strong base such as NaOH?
1. H₃PO₄ titration curve has only one equivalence point.
2. H₃PO₄ titration curve has only two equivalence points.
3. H₃PO₄ titration curve has only three equivalence points.
4. H₃PO₄ titration curve does not have any equivalence point.
5. H₃PO₄ titration curve has only seven equivalence points.
Which of the following reactions is not a redox reaction?
1. H₂SO₄ + BaCl2 → BaSO₄ + 2HCl
2. CuSO₄ + Zn → ZnSO₄ + Cu
3. 2NaI + Cl₂ → 2NaCl + I₂
4. C + O₂ → CO₂
5. None

Answer questions 15 to 18 based on the following chemical equation:

CuSO₄ + Zn → ZnSO₄ + Cu

Which of the following is a reducing agent if the reaction is a redox reac- tion?
1. CuSO₄
2. Zn
3. ZnSO₄
4. Cu
5. the reaction is not a redox reaction
Which of the following species gained electrons?
1. CuSO₄
2. Zn
3. ZnSO₄
4. Cu
5. None
What is the number of electrons gained per mole of the oxidizing agent?
1. 1 mole
2. 2 moles
3. 3 moles
4. 4 moles
5. 0 moles
What is the number of electrons lost per mole of the reducing agent?
1. 1 mole
2. 2 moles
3. 3 moles
4. 4 moles
5. 0 moles
Which one of the following is a redox reaction?
1. H⁺ (aq) + OH^- (aq) → H₂O (l)
2. 2 KBr (aq) + Pb(NO₃)₂ (aq) → 2 KNO₃ (aq) + PbBr₂(s)
3. CaBr₂ (aq) + H₂SO₄ (aq) → CaSO₄ (s) + 2 HBr (g)
4. 2 Al (s) + 3 H₂SO₄ (aq) → Al₂(SO₄)₃ (aq) + 3H₂ (g)
5. CO₃ ^2- (aq) + HSO₄ ^- (aq) → HCO₃ ^- (aq) + SO₄ ^2- (aq)
In the reaction, Zn(s) + 2HCl (aq) → ZnCl₂ (aq) + H₂ (g), what is the oxidation number of H₂?
1. +1
2. -1
3. 0
4. +2
5. -2

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