Which statement explains why there is a change in energy during a chemical reaction? a Chemical bonds are formed and broken, which absorbs energy. b Chemical bonds are formed and broken, which releases energy. c Energy is released when bonds are broken, and energy is absorbed when bonds are formed. d Energy is absorbed when bonds are broken, and energy is released when bonds are formed.
a
An endothermic reaction is a reaction in which heat is released from the system to the surroundings.
b
An endothermic reaction is a reaction in which heat is absorbed into the system from the surroundings.
c
In an endothermic reaction, the stored energy of the products is greater than the stored energy of the reactants.
d
In an endothermic reaction, the stored energy of the products is less than the stored energy of the reactants.
e
In an endothermic reaction, energy is written as a product in the chemical equation.
f
In an endothermic reaction, energy is written as a reactant in the chemical equation.
g
An endothermic reaction does NOT need a continuous supply of energy from the surroundings to keep it going.
h
An endothermic reaction requires a continuous supply of energy from the surroundings to keep it going.
i
In an endothermic reaction, the change in energy is always a positive value.
j
In an endothermic reaction, the change in energy is always a negative value.
k
Lighting a match is an example of an endothermic reaction.
l
Baking bread is an example of an endothermic reaction.
c Energy is released when bonds are broken, and energy is absorbed when bonds are formed.
b An endothermic reaction is a reaction in which heat is absorbed into the system from the surroundings.
c In an endothermic reaction, the stored energy of the products is greater than the stored energy of the reactants.
h An endothermic reaction requires a continuous supply of energy from the surroundings to keep it going.
i In an endothermic reaction, the change in energy is always a positive value.