Reduction with fron. Reduction with iron,
rock melt
sodium chloride
Nact
Electrolysis
Sodium is in group of the periodic Table
(1)
State one physical property of group i elements
Thein dort anko in lam that they
...and
Sodium metat reacts readily with cold water.
Write a balanced equation for this reaction.
24CM
12)
In an experiment, on found to displace copper from its compound
Cuso, (aq) Fe (al Feso, (mg) Outs)
Explain what this experiment shows about the reactivity of iron and copper,
11
Zinc is found to be more reactive than iron
Table in order of reactivity. Start from the most​

scattering of light by tiny particles in air to produce the colors we see on sky, is dependent on the following factors:

(i) wavelength of light

(ii) size of the scattering particle  

(iii) distance traveled by light through the atmosphere.

according to rayleigh's law of scattering, the amount of scattering is inversely proportional to the fourth power of its wavelength. shorter the wavelength, greater is its scattering. hence violet/blue light is scattered more than red.

sun's light is a composite light ( visible light) with wavelengths in the range 400 nm (violet) to 700 nm (red). as sunlight passes through our atmosphere, the molecules of air scatter light according to their wavelengths. during sunrise and sunset, the sun's position is below the horizon. hence light from the sun travels a greater distance in the atmosphere when compared to its position a noon.

as sunlight enters the earth's atmosphere, blue light is scattered away and at the end of its journey in the sky, only red and orange wavelengths remain in the beam.

hence at sunrise and sunset, the sky appears reddish orange.

one person pulls 90n one way and the other has 100n pulling the other way.

so the net force = 90 - 100 = -10n,

or the ans can be 10n if the picture shows -90n and 100n instead.