D) refracted
because , the light changes direction.. causing the penny to look bigger than it is.
A should be the products and D should be the reactants. So D should be the answer.
Combustion=heat and light
decomposition=taking something away
single means one element changes
and double means two elements change l.
Exothermic reaction is where there is release of energy during a reaction
The enthalpy of exothermic reaction is negative
The relation between energy of products, reactants and enthalpy of reaction is
Enthalpy of reaction = sum of enthalpy of formation of products - sum of enthalpy of formation of reactants
.
As enthalpy of reaction is negative, it means the enthalpy of products is less than the enthalpy of reactants so answer is
:
In an exothermic reaction the energy of the product is less than the energy of the reactants.
