Question

Selenium and sulfur are in Group VI. They have similar properties.
(a) One of the main uses of selenium is in photoelectric cells. These cells can change light
(i)Name a process which can change light into chemical energy.
(ii) Name a device which can change chemical energy into electrical energy .
(b) The electron distribution of a selenium atom is 2 + 8 + 18 + 6.
Selenium forms an ionic compound with potassium. Draw a diagram which shows
the formula of this ionic compound, the charges on the ions and the arrangement of
the valency electrons around the negative ion.
Use o to represent an electron from an atom of potassium.
Use x to represent an electron from an atom of selenium.

Answer 1

Answer:

a) (i) Photosynthesis is the process by which organisms that contain pigment chlorophyll convert light into chemical energy which can be stored in the molecular bonds of organic molecules. (eg. - sugars)

(ii) A battery is a device that converts chemical energy contained within its active materials directly into electric energy by means of an electrochemical oxidation- reduction (redox) reaction. This type of reaction involves the transfer of electrons from one material to another via and electric circuit.

b) DON'T KNOW HOW TO DRAW A DIAGRAM ON BRAINLY ......______________....... SORRRRYYYY!!!!!!