Reactions Flashcards
What happens when reactants reverse themselves and what is it called?
Reactants reverse themselves and the products change back to being reactants again, this is called a reversible reaction
What is the calculation to work out the percentage of yield?
Yield
(divided by) x100
expected yield
What is an example of an exothermic reaction?
Hand warmers using oxidation of iron
What is an example of an endothermic reaction?
An instant cold pack
What are the 3 ways you can measure a reaction?
Mass
Volume
Light transmitted
What factors speed up reactions?
Increased temperature Increased concentration of dissolved reactants Increased pressure of gaseous reactants Increased surface area Use of a catalyst
What does the rate of a reaction depend on?
The frequency of collisions between particles
The energy with which particles collide
What are catalysts?
Catalysts are substances that change the rate of a reaction without being used up in a reaction
How do catalysts work?
By lowering the activation energy of a reaction
What is an exothermic reaction?
A reaction or process accompanied by the release of heat and an increase of outside temperature
What is an endothermic reaction?
A reaction or process accompanied by the absorption of heat and a decrease in surrounding temperature
Finish the sentence… Exothermic is where…
Heat is let out
Finish … Endothermic is where…
Heat is taken in
What does breaking bonds mean?
Energy is being used
What does making bonds mean?
Energy is lost
