Question

please answer all the questions​

Answer 1

14). Adaptive features of polar bear

• thick layers of fat and fur - for insulation against the cold.
• Small surface area- to minimise heat loss.

15). Mercury is the only one in liquid state at room temperature. It's used in thermometers because it has high coefficient of expansion. Hence, the slightest change in temperature is notable when it's used in a thermometer.

16). Turmeric is an indicator that turns into red with a base. Since, soap is basic in nature, the turmeric stain converts into red colour.

17). The essential component for rusting is the contact of metal with oxygen and moisture. When the iron gate is painted, it protects the iron to get in contact with oxygen, hence prevents it from rusting.

18). China rose indicator:

• converts acidic solution to dark pink.
• converts basic solution to green colour.