Energy Diagrams
Refer to the image in Google Classroom.
The letter A shows the starting substances.
Reactants
A reaction that releases energy is called....
Exothermic
ΔH represents the __ change of a reaction.
Energy (or heat)
This is the minimum energy needed to start a reaction.
Activation Energy
HotHand Packs release heat. They are an example of an...
Exothermic Reaction
The letter B shows the energy needed to start the reaction.
Melting Ice is an example of an...
Endothermic Reaction
If ΔH is negative, the reaction is...
Exothermic
A substance that lowers activation energy without being used up is called a...
Catalyst
Cold Packs absorb heat. They are an example of an...
Endothermic Reaction
Refer to the image in Google Classroom.
The letter E shoes the energy difference between reactants and products.
ΔH (Delta H), Enthalpy Change
Burning Fuel is an example of a(n)...
Exothermic Reaction
If ΔH is positive, the reaction is...
Endothermic
True or False: A catalyst changes the total energy released by a reaction.
False
Why does a match need to be struck to light?
To provide activation energy
Exothermic
If energy is absorbed from the surroundings, the reaction is....
Endothermic
Which has higher energy in an exothermic reaction: Reactants or Products.
Hint: Recall the reactant and product placement on an energy diagram.
Reactants
Why don't all exothermic reactions happen automatically?
They need activation energy to start.
Why does sweating cool your body?
Hint: Think about Evaporation
Evaporation is endothermic and absorbs heat.
Each team come collect 1 page of the copied Energy Diagram. Label it, and submit it to the teacher. Skip letter C.
A: Reactants
B: Activation Energy
D: Products
E: △H (Enthalpy Change)
True or False: Endothermic reactions feel cold because they absorb heat.
True
What does the sign on ΔH tell you?
Whether energy is released or absorbed.
Name one way activation energy can be provided.
Heat, Spark, Light
Explain 1 real-life example of an exothermic or endothermic process.
Any example with explanations.