Question 1

the energy needed to decompose water would be greater than 483.6 KJ if we started with ice

Accepted Answer

because extra energy would be needed to go from ice to liquid and then to 
vapor

Question 2

the physical states of reactants and products must always be included in thermochemical equation

Accepted Answer

because they influence the overall amount of energy as heat gained or lost

Question 3

the energy that is released comes from the reactants as they form products, the reaction is exothermic

Accepted Answer

because the energy that is released comes from the reactants as they form 
products so because the energy is released the reaction is exothermic

Question 4

the data collected from the calorimeter are temperature changes

Accepted Answer

because energy cannot be measured directly but temperature which is affected by the transfer of energy as heat is directly measured

Question 5

the formation of sodium ions illustrates an oxidation process

Accepted Answer

because each sodium atom loses an electron to become a sodium ion

Question 6

water is considered as amphoteric

Accepted Answer

because when it reacts with acids it acts as base and when it reacts with bases it acts as acid

Chemistry 3