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.

Explain why the aperture of the spherical mirror should be small compared to the radius of curvature of the mirror.

Which of the following elements is in the same period as phosphorus? a. carbon c. nitrogen b. magnesium d. oxygen select the best answer from the choices provided a b c d

Mass (kg) force (n) 5 25 10 50 15 75 20 100 a student was trying to find the relationship between mass and force. he placed four different masses on a table and pulled them using a spring scale. the table shows the different masses used in the experiment and the force required to pull each mass. the student concluded that more force was required to pull heavier objects. what comment would you make regarding his conclusion? a) no clear relation can be observed between mass and force from the data. b) there is a direct proportion between the mass and force listed in the table. c) gravity should have been taken into account while performing the experiment. d) there is an inverse proportion between the mass and force listed in the table.