Question

please answer my questions please
and my classes 9 all lessons please reply my answer very fast and right answer​

Answer 1

Explanation:

Ans 1 =Diffusion is the net movement of anything from a region of higher concentration to a region of lower concentration. Diffusion is driven by a gradient in concentration. The concept of diffusion is widely used in many fields, including physics, chemistry, biology, sociology, economics, and finance.

Ans 2

The latent heat of fusion implies the transformation of a liquid to a solid. The latent heat of vaporization implies the change from a liquid to a gas. The latent heat of sublimation implies the change from a solid to a gas.

Ans 3

Sublimation is the transition of a substance directly from the solid to the gas state, without passing through the liquid state

Ans4

Dry ice, carbon dioxide in its solid form, a dense, snowlike substance that sublimes (passes directly into the vapour without melting) at −78.5 °C (−109.3 °F), used as a refrigerant, especially during shipping of perishable products such as meats or ice cream.

Ans5

A gas exerts pressure on the walls of the container. Reason: They have high kinetic energy and negligible force of attraction to move constantly moving with high speed in all directions. Due to this intense random motion of particles, the particles hit each other and hit the container walls with force.

Ans 6

Substitute the given value in the equation and then calculate the other unknown value.

To change a temperature on the Kelvin scale to the Celsius scale we have to subtract 273 from the given temperature

a) 292 K = (292 – 273)

= 21 °C

b) 470 K = (470 – 273)

= 197 °C

Ans 7

) 25° C

25° C = (25 + 273) K

= 298 K

b) 373° C

373° C = (373 + 273) K

= 646 K