Fill in the blanks with words from the Word Bank.

The basic premise of the collision theory is that particles must first 1)______________if a reaction is to occur. Additionally, that 2)__________ must be effective. To be effective, the particles must 3)____________ with the 4)__________  and the proper amount of 5)________________.   6)____________ is the study of reaction rates which is the rate at which the 7)_________________ disappear and the products 8)_________________.

Word Bank
appear	Chemical Kinetics	collide
collide	collision	correct orientation
energy	reactants

Short Answer Questions

9. Use the collision theory to explain why iron filings rust faster than iron wire.

10. Use the collision theory to explain why a mixture of hydrogen gas and chlorine gas reacts faster when the volume they occupy is decreased.

Fill in the blanks with words from the word bank.

11)_______________ act as catalysts in our bodies. Outside the body, sugar burns only when temperatures are above 600 ºC, but inside the body sugar burns (is oxidized) at normal body temperature, which is 37 ºC. How is this possible? The enzymes 12)_____________ the required 13)_____________for an effective collision.

Double arrows in an equation mean that the equation is 14)_____________. Brackets around a formula represent 15)__________________. In a state of chemical equilibrium, the forward and reverse reactions are proceeding at the same rate. 16)______________’s Principle states that when a stress is applied to a system in 17)____________, the system reacts to 18)_____________ the stress.

concentration	energy	enzymes
equilibrium	Le Chatelier	lower
reduce	reversible

Match items on the left to the correct choice on the right.

Word Bank
19. catalyst		a.  Chemical kinetics is a branch of physical chemistry concerned with the mechanisms and rates of these kinds of reactions
20. chemical		b.  A reversible reaction is a chemical reaction that results in an equilibrium mixture of reactants and these
21. endothermic		c. He stated that when a system in equilibrium is subject to stress, i.e. to a change in its conditions, the system will adjust itself to annul, as far as possible, the effect of the stress. A principle is named after him.
22. exothermic		d. An applied force or system of forces that tends to shift a reaction.
23. inhibitor		e. Characterized by or causing the absorption of heat.
24. Le’ Chatelier		f. A substance, usually used in small amounts relative to the reactants, that modifies and increases the rate of a reaction without being consumed in the process.
25. products		g. One that inhibits, as a substance that retards or stops a chemical reaction.
26. reversible		h. Type of reaction in which the equilibrium constant is such that the reaction can be made to proceed at a detectable rate in either direction under appropriate conditions.
27. stress		i. Releasing heat.

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