Energy Reactions Flashcards
What is an endothermic reaction?
Heat energy is absorbed from its surroundings
e.g. Instant ice packs, photosynthesis
What is an exothermic reaction?
Heat energy is released into its surroundings
e.g. Instant heat packs, Freezing, fire burning
What is activation energy?
The minimum energy a chemical reaction needs to make a new substance
In an exothermic energy profile, is reactants or products lower?
Products is lower than reactants
In an endothermic energy profile, is reactants or products lower?
Reactants is lower than products
How do you calculate activation energy?
Top E.A - Reactants E.A
How do you measure a heat change on an energy profile diagram?
Products - Reactants
What is valency?
The maximum number of electrons an element will give, take from or share with another element
