Exothermic and Endothermic Reactions Flashcards
What is an exothermic reaction?
A reaction that gives out heat to the surroundings
What is an endothermic reaction?
A reaction that takes in heat from the surroundings
What happens to the temperature of the surroundings in an exothermic reaction?
The temperature goes up
What happens to the temperature of the surroundings in an endothermic reaction?
The temperature goes down
What observations might you make during an exothermic reaction
Light and/or heat given off
Is combustion (burning) an exothermic or endothermic reaction?
Exothermic
Give a use for endothermic reactions
Self-cooling sports injury packs
Give a use for exothermic reactions
Self-heating food containers, hand warmers
What is a reversible reaction?
A reaction that can go in the forward and reverse directions
A reversible reaction is exothermic in the forward direction. Will the reverse reaction be exothermic or endothermic?
Endothermic
A reversible reaction is endothermic in the forward direction. Will the reverse reaction be exothermic or endothermic?
Exothermic
If a reversible reaction absorbs 100J of energy in the forward reaction, what will happen in the reverse direction?
The reverse reaction will release 100J of energy
When metal X is added to acid, the temperature rises by 5 degrees C. When metal Y is added to acid, the temperature rises by 20 degrees C. Which metal is more reactive?
Y
300 J of energy are taken in when hydrated copper(II) sulfate crystals are heated. What is the energy change when water is added to the anhydrous copper(II) sulfate produced?
300J are released
A student wants to measure the temperature rise when an acid is added to an alkali. How is this done accurately?
Add the acid and alkali to a beaker that is insulated and has a lid to reduce heat loss.
