Thermochemistry

In the reaction depicted in the diagram above,

• the energy content of the products is greater than the energy content of the reactants

• the energy content of the reactants is greater than the energy content of the products

• the energy content of the reactants is the same as the energy content of the products

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-4

In the reaction depicted in the diagram above,

• the energy content of the products is greater than the energy content of the reactants

• the energy content of the reactants is greater than the energy content of the products

• the energy content of the reactants is the same as the energy content of the products

Tags

NGSS.HS-PS1-4

The line that represents the activation energy (E_a) of this reaction is

• Line A

• Line B

• Line C

• Line D

• Line E

Tags

NGSS.HS-PS1-4

The activation energy (E_a) of this reaction is ___ kJ

• 40

• -80

• 80

• 240

• -240

Tags

NGSS.HS-PS1-4

The line that represents the activation energy (E_a) of this reaction is

• Line A

• Line B

• Line C

• Line D

Tags

NGSS.HS-PS1-4

If you were holding in your hand a test tube in which the reaction above is taking place, it would

• feel cold, because energy is being released

• feel cold, because energy is being absorbed

• feel hot, because energy is being absorbed

• feel hot, because energy is being released

Tags

NGSS.HS-PS1-4

The graph shows an area called the transition state. What is happening at this transition state. (This one takes a little thought)

• All reactant bonds are broken.

• There are no atoms at this point

• All product bonds are formed

• The law of conservation of mass is broken for a brief moment in time.

Tags

NGSS.HS-PS1-4

NGSS.HS-PS1-7

In an endothermic reaction, heat is ...

• taken in

• given out

Tags

NGSS.HS-PS1-4

During an endothermic reaction in a beaker if we are part of the surroundings and touched the beaker, it would feel _______. 

• Warm

• Cold

Tags

NGSS.HS-PS3-4

What type of reaction is shown in the photo?

• Exothermic

• Isothermic

• Endothermic

• None of the  above

Tags

NGSS.HS-PS1-4