Monday, July 4, 2011

(Viva Voce) Chap 9 Exercise 9 Question 4

video




Question 4:
Alcohol and water are mixed in the ratio 1:4 by volume. If the volume of the solution is 600cm^3
(a) Find the volume of alcohol in the solution
600 ÷ 5=120
120cm^3
(b) Find the volume of water in the solution
120 X 4 = 480
480cm^3
(c) how much alcohol must be added to the solution so that the ratio of alcohol to water in the solution becomes 1:3 by volume?



Alcohol (cm^3)
Water (cm^3)
Total (cm^3)
Ratio

120                        
480                           
600                              
1:4
240
480 
720
1:2
160
480
640
1:3
 

We need to add 40cm^3 of alcohol

1 comment:

  1. well done Denzel.
    Just point to note for improvement
    .1 increase screen / picture resolution
    .2 use clear screen to avoid distraction

    Good intonation and delivery

    ReplyDelete