How would you approach these with explanation, so understand how to answer these type of questions for my final exam Friday. Thanks Q.

413

413 kJ of energy will be absorbed when 1 mol of C - H bonds are formed

Choose...

true

false

413 kJ of energy will be absorbed when 1 mol of C - H bonds are broken

Choose...

true

false

413 kJ of energy will be released when 1 mol of C - H bonds are formed

Choose...

true

false

413 kJ of energy will be released when 1 mol of C - H bonds are broken

Choose...

true

false

Q.29

Use the following information to answer the next question.

1.N2(g)+2O2(g)+11.1 kJ→N2O4(g)

2.N2(g)+O2(g)→2NO(g)   ΔrH∘=+197 kJ

3.2CH3OH(l)+3O2(g)→4H2O(l)+2CO2(g)+1275.8 kJ

4.FeO(s)+CO(g)→Fe(s)+CO2(g)   ΔfH∘=−11.0 kJ

When the above reaction equations are listed from the most endothermic to the most exothermic, the order would be  

_ ,_  ,_  ,_  

Q.30

Use the following information to answer the next question.

Student's observations

In a laboratory, a student mixed a solid with a solution. As the student stirred the container, the student noted that the beaker started to heat up.

Which of the following reaction equations could represent the student's chemical reaction based on the student's observations?

Select one:

A) AB+C+energy→AC+B

B) AB+C−energy→AC+B

C) AB+C→AC+B+energy

D) AB+C→AC+B−energy

Q.31

Activation energy is used to determine if a chemical reaction is endothermic or exothermic.

Select one:

True

False