exothermic and endothermic (2.1)

Question 1

law of conservation of energy

Answer 1

energy cannot be created or destroyed. It can change forms and the total amount of energy stays the same.

Question 2

systems

Answer 2

• system refers to the chemical reaction.
  so when energy is released or absorbed by the system, we refer to energy changes that occur as bonds are broken and formed between the atoms

Question 3

surroundings

Answer 3

usually everything other than tthe system. energy leaves the system and enters the surroundings or vice versa

Question 4

energy changes during chemical reactions

Answer 4

the product that form as a result of the rearrangement of particles during the chemical reaction have different bonds and so have different amount of chemical energy

Question 5

exothermic

Answer 5

• when the total amount of energy of products is less than the total amount of energy of reactants.
• excess energy is released into the surrounding environment

Question 6

endothermic

Answer 6

• when the total amount of energy of productor is greater than the total amount of energy of reactant
• energy is absorbed from the surrounding environemnt
• requires a constant input of energy