Home
Class 9
PHYSICS
Give reasons for the following observati...

Give reasons for the following observation. The smell of hot sizzling food reaches you several matters away but to get the smell from cold food you have to go close.

Text Solution

Verified by Experts

Rate of evaporation depends upon temperature.
Promotional Banner

Similar Questions

Explore conceptually related problems

Give reason for the following observations. We can get the smell of perfume sitting several metres away.

Give reasons for the following observation: (a)The element carbon forms a very large number of compounds. (b)Air holes of a gas burner have to be adjusted when the heated vessels get blackened by the flame. c)Use of synthetic detergents causes pollution of water.

Write equations for the following statements: If you take away 6 from 6 times y, you get 60.

Give reasons for the following: a. Ionic compounds in general have high melting and boiling points. b. Highly reactive metals cannot be obained from their oxides by heating them with carbon. c. Copper vessel get a green coat when left exposed to air in the rainy season.

(i) Give an example for an a combination reaction which is exothermic . (ii) Identify the oxidising agen, reducing agent in the following reaction : H_(2)S+Clrarr2HCl+S (iii) Name the phenomenon due to which the taste and smell of oily food changes when kept for a long time in open. Suggest one method to prevent it.

(i) Identify the acid and the base whose combination forms the common salt that you use in your food. Write its formula and chemical name of this salt. Name the source from where it is obtained. (ii) What is rock salt? Mention its colour and the reason due to which it has this colour. (iii) What happens when electricity is passed through brine? Write the chemical equation for it.

State whether the Or' used in the following statements is exclusive or " inclusive Give reason for your answer. (i) All intergers are positive or negative (ii) To apply for a driving licence , you should have a ration card or a passport .

Many microbial pathogens enter the gut of humans along with food.What are the preventive barriers to protect the body from such pathogens?What type of immunity do you observe in this case?