Chemistry: Online test questions on Chemical Reaction

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.