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Unit 12 Lessons 1 and 2

Last updated 3 months ago

8 questions

Required

1

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Question 1

1.

Every collision between reactants results in the formation of new products?

True

False

Question 2

2.

According to the law of conservation of energy, the total energy of the universe is

Question 3

3.

Question 4

4.

The energy of the reactants was 100 kJ/mol and the energy of the products is 150 kJ/mol, what is the heat of the reaction?

+250 kJ/mol

-50 kJ/mol

+50 kJ/mol

-250 kJ/mol

Question 5

5.

The reaction in the previous question is

endothermic

exothermic

Question 6

6.

The speed of a reaction is determined by

how to molecules change phase.

how old the bonds are.

how the molecules collide.

if it is endothermic or exothermic.

Question 7

7.

Question 8

8.

Speeding up a reaction means

the frequency of collisions increases.

the frequency of collisions decreases.

Which of the following are ways to speed up a reaction:

decrease the surface area

remove a catalyst.

decrease the concentration

increase the concentration

use a catalyst.

increase the temperature

increase the surface area

decrease the temperature