Give reasons why -
1) Gases diffuse easily.
2) Solids are incompressible.
3) Mass remains constant everywhere.
4) Cooking of food is an endothermic process.
5) Swinging of a pendulum clock is a periodic change.
Answers
1) Gaseous particles tend to undergo diffusion because they have kinetic energy. Diffusion is faster at higher temperatures because the gas molecules have greater kinetic energy. ... Graham's Law states that the effusion rate of a gas is inversely proportional to the square root of the mass of its particles.
2) The constituent particles of a solid are very closely packed. ... The inter-particle distances are so small that if we try to bring them closer, repulsions start between their electron clouds. Hence, they are incompressible .
3) mass is constant as it is the quantity of matter contained in a body which doesn't change from place to place whereas weight is the force with which the earth attracts the body abd it changes with 'g'.
4) Cooking food is endothermic since food receives heat energy through cooking. It will not release energy while cooking. The heat is distributed through the food while it's cooking, and that's the reason we get our food ready. ... Thus cooking is an endothermic process.
5) A pendulum consists of a weight suspended on a rod, string or wire. When the weight or bob is moved and let go, the pendulum will swing back and forth in a regular periodic motion. The effect of gravity on the bob results in the periodic motion, and the length of the wire determines the frequency of its swing.