5 The apparatus shown below was set up. from cloth stopper
white cloud
glass tube

cotton wool soaked
in concentrated
hydrochloric acid
cotton wool soaked
in concentrated
ammonia solution
Give explanations for the following observations.

a The formation of a white cloud.

b It took a few minutes before the white cloud
formed.

c The white cloud formed further from the cotton
wool soaked in ammonia.

d Cooling the concentrated ammonia andhydrochloric acid before carrying out the
experiment increased the time taken for the
white cloud to form.

the temperature in kelvin of 2.0 dm3 of an ideal gas is doubled and its pressure is increased by a factor of four. what is the final volume of the gas

the aurora is formed when charged particles emitted from the sun during a solar flare penetrate the earth's magnetic shield and collide with atoms and molecules in our atmosphere. these collisions result in countless little bursts of light, called photons, which make up the aurora.

auroras are generated by charged solar particles hitting molecules in earth's atmosphere. this usually happens in high latitudes, because our planet’s magnetic field tends to funnel these particles toward the poles. that’s why it can be experienced in northern ohio.