science - use of fuels/thermal decomposition

Question 1

what colour flame does a complete combustion produce?

Answer 1

yellow

Question 2

what colour flame does an incomplete combustion produce?

Answer 2

blue

Question 3

a chemical reaction in which thermal energy is transferred to the surrounding

Answer 3

exothermic reaction - ex=exit=thermal enegry exits

Question 4

any chemical reaction hat absorbs heat from the environment

Answer 4

endothermic reaction - en= entry = absorbs

Question 5

what is the definition for fuel?

Answer 5

a substance that is burnt for the purpose to generate heat

Question 6

what is thermal decomposition

Answer 6

when a chemical substance is broken down by heat into two or more chemical substances. They are the same however it is just a simpler version

Question 7

thermal decomposition and combustion are the same. Explain why this statement is not correct

Answer 7

They are NOT the same as thermal decomposition means the object is being heated whilst combustion means that the object is being burned

Question 8

Is an exothermic reaction bond-making or bond-breaking?

Answer 8

bond-making

Question 9

is an endothermic reaction bond-making or bond-breaking?

Answer 9

bond-breaking