Question

(i)____________is always taken in or given out.If it is given out then heat or (ii)____________may be produced during chemical change.A chemical reaction involves the change of substances called (iii)____________ to a new a new substance called (iv)____________.This chemical change occurs as the atoms in the reaction undergo (v)____________.

• A. i) Energy ii) Light iii) Reactants
• B. iv) Products v) Rearrangement

Answer 1

• During a chemical reaction it is found that energy is always taken in or given out during the reaction
• When energy is given out in a reaction (exothermic), it is seen as heat and light are evolved
• The substances which react with each other and are found on the left-hand side of a chemical reaction are known as reactants
• And the ones which are formed in the process and found on the right-hand side of the reaction are called products.
• The bonds of the reactants breaks and are reformed and rearrangement occurs to form new bonds for the product.
  
• Hence, (i)___Energy__is always taken in or given out.If it is given out then heat or (ii)____light ________may be produced during chemical change.A chemical reaction involves the change of substances called (iii)____reactants ________ to a new a new substance called (iv)___products_________.This chemical change occurs as the atoms in the reaction undergo (v)____rearrangement ________.