| Find the correct answer by clicking on the choice given. 1. The pH of a 1 molar solution of a weak acid with a Ka = 10-10 will be... | ||
| (a) | 2.5 | |
| (b) | 5 | |
| (c) | 10 | |
| (d) | Yikes! This question is lowering the pH of my stomach. | |
| 2. What is the oxidation number of chromium in the ionic compound Na2Cr2O7? | ||
| (a) | 2 | |
| (b) | 6 | |
| (c) | 7 | |
| (d) | 12 | |
| 3. Which Brønsted acid (H2O or H2S (aq)) is the stronger acid and why is it the stronger acid? | ||
| (a) | H2O is the stronger acid because oxygen has a greater electronegativity than sulfur, which gives the attached hydrogen atom more proton character. | |
| (b) | H2O is the stronger acid because H2S is a gas and gases are not acids. | |
| (c) | H2S is the stronger acid because the hydrogen-sulfur bond is much weaker than the hydrogen-oxygen bond due to a greater difference in atomic orbital energy levels. | |
| (d) | H2S is the stronger acid because it is a heavier molecule and therefore has more energetic collisions. | |
| 14. Which Brønsted acid (HCl (aq) or H2S (aq)) is the stronger acid and why is it the stronger acid? | ||
| (a) | HCl is the stronger acid because it is a better proton donor. | |
| (b) | HCl is the stronger acid because the hydrogen-chlorine bond is much weaker than the hydrogen-sulfur bond due to a greater difference in atomic orbital energy levels. | |
| (c) | HCl is the stronger acid because chlorine has a greater electronegativity than sulfur, which gives the attached hydrogen atom more proton character. | |
| (d) | H2S is twice as strong an acid as HCl because it has two acidic hydrogen atoms versus only one hydrogen atom in HCl. | |
| 5. What is the oxidation number of nitrogen in the molecule N2? | ||
| (a) | 0 | |
| (b) | 3 | |
| (c) | 5 | |
| (d) | 7 | |
| 6. Which of the following compounds is the strongest Brønsted acid? | ||
| (a) | H2SO4 | |
| (b) | CH3CO2H | |
| (c) | HNO3 | |
| (d) | H3PO4 | |
| 7. Which of the following compounds is the strongest Brønsted base? | ||
| (a) | NaHSO4 | |
| (b) | NaCH3CO2 | |
| (c) | NaNO3 | |
| (d) | NaH2PO4 | |
| 8. Which of the following compounds is the strongest Brønsted base? | ||
| (a) | NaCH3 | |
| (b) | NaOH | |
| (c) | NaF | |
| (d) | NaNH2 | |
| 9. Which of the following compounds is the strongest Brønsted acid? | ||
| (a) | NH3 | |
| (b) | HF | |
| (c) | H2O | |
| (d) | CH4 | |
| 10. Which of the following chemical equations correctly represents the reaction between aluminum and oxygen? | ||
| | ||
Showing posts with label MCQ on Chemical Reaction. Show all posts
Showing posts with label MCQ on Chemical Reaction. Show all posts
Chemistry: MCQ questions on Chemical Reaction
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Chemistry: Online test questions on Chemical Reaction
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| Find the correct answer by clicking on the choice given. 1. If the temperature of a reaction is increased by 20oC, the reaction rate will be... | ||
| (a) | 2 times as fast. | |
| (b) | 4 times as fast. | |
| (c) | 20 times as fast. | |
| (d) | unchanged because the reaction rate is not dependent on the temperature. | |
| 2. The following reaction coordinate diagram represents... | ||
| (a) | an endothermic reaction. | |
| (b) | an exothermic reaction. | |
| (c) | a reaction that is neither endothermic nor exothermic. | |
| (d) | a reaction in which a catalyst is used. | |
3. When the following reaction equation is properly balanced, the number of moles of O2 will be...  | ||
| (a) | 1.5 moles | |
| (b) | 3.5 moles | |
| (c) | 3 moles | |
| (d) | 5 moles | |
4. When the following reaction equation is properly balanced, the number of moles of O2 will be...  | ||
| (a) | 1.5 moles | |
| (b) | 13 moles | |
| (c) | 19 moles | |
| (d) | 38 moles | |
| 5. Which of the following correctly represents the balanced chemical reaction between aluminum and sulfur? | ||
| 6. An equilibrium constant of 10-4 for a reaction means that the reaction is... | ||
| (a) | one that will have 50% product and 50% reactant at equilibrium. | |
| (b) | one that is very favorable and will have mostly product at equilibrium. | |
| (c) | one that is unfavorable and will not have very much product at equilibrium. | |
| (d) | The equilibrium constant only relates to the speed of a reaction and not to the amount of product formed. | |
| 7. Which of the following equations represents the equilibrium equation for the following reaction? | ||
| 8. If additional calcium phosphate is added to the above reaction mixture, what will happen to the overall reaction? | ||
| (a) | There will be no change in the overall reaction. | |
| (b) | The reaction will occur at a faster rate. | |
| (c) | Less of the reactants will react in order to compensate for the increase in the amount of one of the products of the reaction. | |
| (d) | More of the reactants will have to react in order to compensate for the increase in the amount of one of the products of the reaction. | |
| 9. In a single replacement reaction, why will one metal replace another metal in an ionic compound? | ||
| (a) | The metal will replace another metal if it has a smaller mass and thus is able to hit the ionic compound with a higher velocity and thus more energy. | |
| (b) | The metal will replace another metal if it has a larger mass and thus is able to hit the ionic compound with more energy. | |
| (c) | The metal will replace another metal if it can gain electrons more readily than the other metal. | |
| (d) | The metal will replace another metal if it can lose electrons more readily than the other metal. | |
| 10. When two ionic compounds are dissolved in water, a double replacement reaction can... | ||
| (a) | never occur since all ions in water are "spectator ions". | |
| (b) | occur if two of the ions form an insoluble ionic compound, which precipitates out of solution. | |
| (c) | occur if the ions react to form a gas, which bubbles out of the solution. | |
| (d) | occur only if the ions form covalent bonds with each other. | |