Which of the following indicates that an exothermic reaction has taken place?
A. a change in color
B. release of heat and/or light energy
C. cooling of the surroundings
D. absorption of heat by the reaction

Question

Which of the following indicates that an exothermic reaction has taken place?
A. a change in color	
B. release of heat and/or light energy	
C. cooling of the surroundings	
D. absorption of heat by the reaction

anonymous · Answer

B

anonymous · Answer

Combustion of coal is a(n) ___________ reaction.
A. endothermic	
B. physical	
C. heat-absorbing	
D. exothermic
will you help me finish this test? i'm like begging :(

anonymous · Answer

D

anonymous · Answer

Since exothermic reactions give off heat, they are exceptions to the law of conservation of energy and they are able to create new energy.
True	 
False

anonymous · Answer

Remember there is a net release of energy in exothermic reactions - like the heat released when coal is burnt. Whereas endothermic reactions absorb energy from their surroundings

anonymous · Answer

False, no new energy is created. Stored energy is released.

anonymous · Answer

ah okay :) 
Photosynthesis is ___________ reaction, because it needs sunlight to proceed.
A. an exothermic	B. an electric	C. an endothermic	D. a combustion

anonymous · Answer

c. an endothermic (because it takes in energy to complete reaction)