Question

Q1. What happens when we forget to keep milk inside
the refrigerator for long time in summers? Are we
able to get back the same quality of milk again?
Q2.
What happens to the iron nail when it is left
exposed to humid atmosphere for a long time?
Q3.
Quote certain examples of chemical reactions from
the daily life.
Q4.
Is fermentation of grapes a chemical change? If yes
then how?
Q5.
Q6.
Q7.
Cooking of food is a chemical change. Explain.
Give two examples of the chemical reactions which
take place in our body.
Chemical reaction is a process in which the
chemical identity of initial substance gets changed.
Explain the statement with the help of examples.
Can we say that chemical reaction occurs when a
substance undergoes chemical changes?
Burning of magnesium ribbon is a chemical
change. Why?​

Answer 1

Answer:

No we haven't carry the milk

Answer 2

When the milk is left in open for a long time, bacteria named Lactobacillus grows in the milk. These bacteria converts the lactose present in the milk into lactic acid. Due to the presence of lactic acid the taste of the milk changes to sour. No, we do not get back the same quality of milk.