Chapter 7 Electro Chemistry

Question 1

How is chlorine identified

Answer 1

First take a moistened piece of blue litmus paper to the mouth of test tube obtaining chlorine gas

Result : the blue litmus paper first turns red and is then bleached by chlorine

Question 2

Write half reaction L- and M+

Answer 2

L= L+ + e-

M+ + e- = M

Question 3

What precaution should u take note when doing electrolysis of Bromide II

Answer 3

Should be carried at a free water space

Question 4

Electrolysis of aqueous sodium chloride is used to manufacture important chemical in an industry

Name major product of electrolysis

Answer 4

Hydrogen

Question 5

What chemical changes occur in electrolysis cell

Answer 5

Chemical changes to electrical changes to light

Question 6

What can be used in place electrical bulb to measure electricity produced

Answer 6

Voltmeter

Question 7

Why do pure water do not decompose when used in an electrolysis reaction

Answer 7

Because it’s a poor conductor of electricity

Question 8

What can occur in an electro in a simple cell when the silver rod is replaced by a copper rod in a magnesium road

Answer 8

Magnesium is more electro positive than both so be the same whether silver nor copper

Question 9

How reactive is platinum foil when connected to electricity

Answer 9

Un reactive

Question 10

How is electricity produced in an electrochemical cell which has L- and M+ metals

Answer 10

Metal L ionizes by electrons passing the electron to M through wire . This cause electronic flow producing chemical energy then coveted into electric energy