Question

Question
1
Question
2
A)
In order to break a bond, energy must be
(1 point)
released.
produced.
absorbed.
removed.
A)
Use the chemical equation to answer the question.
This is the chemical equation for the burning of methane gas. Which of the following explains why thisprocess is exothermic?
(1 point)
CH4 + 2O2 → 2H2O + CO2
More energy is released from the breaking of old bonds than is absorbed from the formation of new bonds.
More energy is absorbed from the breaking of old bonds than is released from the formation of new bonds.
Less energy is released from the breaking of old bonds than is absorbed from the formation of new bonds.
Less energy is absorbed from the breaking of old bonds than is released from the formation of new bonds.
Question
3
Question
4
A)
Which is the strongest: single, double, or triple bonds?
(1 point)
double bonds
triple bonds
All bonds have the same strength.
single bonds
A)
Use the reaction to answer the question.
This reaction is exothermic. What does that mean?
(1 point)
C2H2 + 3H2 → 2CH4
The reaction does not consume or produce energy.
The reaction absorbs energy as it occurs.
It would not occur without additional energy.
It would occur without additional energy.
Question
5
A)
Use the reaction to answer the question.
Which describes this reaction, endothermic or exothermic? Why?
(1 point)
C2H6 + energy → C2H4 + H2
This reaction is exothermic, because more energy is taken in than released.
The reaction is endothermic, because more energy is released than taken in.
The reaction is exothermic, because more energy is released than taken in.
The reaction is endothermic, because more energy is taken in than released.

Answer 1

Here are the answers:

Question 1
- absorbed (breaking a bond requires input of energy)

Question 2
- Less energy is absorbed from the breaking of old bonds than is released from the formation of new bonds. (Combustion is exothermic because bond formation releases more energy than is required to break the reactant bonds.)

Question 3
- triple bonds (strongest)

Question 4
- It would occur without additional energy. (Exothermic reactions release energy as they proceed.)

Question 5
- The reaction is endothermic, because more energy is taken in than released. (Energy appears on the reactant side, so it must be absorbed.)