Answer:
40mL of glycerol are needed to make a 20% v/v solution
Explanation:
This problem can be solved with a simple rule of three:
20% v/v is a sort of concentration. In this case, 20 mL of solute are contained in 100 mL of solution.
Therefore, in 100 mL of solution you have 20 mL of solvent (glycerol)
In 200 mL, you would have, (200 .20)/ 100 = 40 mL
Answer:
5.6
= 3.4 X 
Explanation:
the correct answer to it is 3.4 instead of 3.2. I got 3.4 from rounding it from 3.37.
An A horizon is a mineral horizon, It forms at the surface as topsoil. O horizon turns eventually into topsoil
Answer:Iron is extracted from iron ore in a huge container called a blast furnace. Iron ores such as haematite contain iron(III) oxide, Fe 2O 3. The oxygen must be removed from the iron(III) oxide in order to leave the iron behind. Reactions in which oxygen is removed are called reduction reactions.
