Question

7. According to collision theory, what needs to happen for a reaction to take place?

A. particles need to be in the same phase
B. particles must collide in the correct orientation
C. particles must collide in any orientation
D. a transfer of energy from the system to the surroundings must take place

Answer 1

B. particles must collide in the correct orientation

Answer 2

8. Enzymes are found in the human body as a _____ for organic reactions that would otherwise be too slow.

A. collider
B. key
C. catalyst
D. temperature boost

Answer 3

C. catalyst

Answer 4

H2 + O2, what purpose does the flame (lighter) serve?

A. The flame causes condensation
B. The flame provides activation energy.
C. The flame is one of the reactants.
D. The flame provides energy for electrolysis.

Answer 5

B. The flame provides activation energy.

Answer 6

10. Calorimeters are used to measure bond energy by providing


A. an open system, where matter and heat can be exchanged with the surroundings.
B. A closed system, where heat can be exchanged with the surroundings, but not matter.
C. An isolated system, where neither heat nor matter can be exchanged with the surroundings.
D. A combined system, where heat and matter can periodically be exchanged with the surroundings.

Answer 7

C. An isolated system, where neither heat nor matter can be exchanged with the surroundings.

Answer 8

12. The speed at which a reaction takes place is the
A. reaction rate
B. reactant concentration
C. kinetic energy
D. reaction orientation

Answer 9

A. reaction rate