Q. 12 Explain endo thamic and exothermic are ction with examples.
Q. 13 What is the velocity of an object dropped from a height 'h'
having a mass ‘m' just before reaching the surface ?
Q. 14 Write name composition and uses of various fraction of
petroleum (Any 4)
Q. 15 Difference between compound and mixture ?
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12-On the other hand, an exothermic reaction releases energy into the surrounding of the system. A popular example of an endothermic chemical reaction is photosynthesis.
...
Exothermic Reactions.
Endothermic Reaction Exothermic Reaction
Energy in the form of heat Energy is released as heat, electricity, light or sound
13-Initial Energy of the body =K.E+P.E
KE
i
=0,PE
i
=mgh
Final Energy KE
f
+PE
f
PE
f
=0
Energy is conserved
Final Energy = Initial Energy
KE
f
=PE
i
=mgh
15--A compound is the substances that are formed by combining two are more chemical elements. A mixture is a substance created from two or more matter that can be separate with the help of physical methods. Compound substances are always homogeneous in nature.
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