20 questions-energy changes

Question 1

what do we call reactions that transfer energy to the surroundings

Answer 1

exothermic

Question 2

A white powder dissolves in water to form a solution. The temperature falls by 2oC. State and explain the type of reaction that has taken place.​

Answer 2

endothermic since the temp falls because energy is being taken in by the surroundings

Question 3

describe an endothermic reaction profile

Answer 3

-the products have more energy than the reactants, and the arrow showing the overall change in energy points upwards.

Question 4

if you calculate a change in bond energy for exothermic reactions would it be negative or positive

Answer 4

negative

Question 5

what proterty of metals makes them suitable to use as electrodes

Answer 5

they conduct electricity

Question 6

whats activation energy

Answer 6

the minimum energy required to start a reaction

Question 7

A chemical reaction gives out more energy when new bonds are formed in the products than it takes in to break the bonds in the reactants. What sort of reaction is it?​

Answer 7

exothermic