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Science Report

746 words - 3 pages

Science Assessment task
Water as a solvent
Part 1:
Definitions
A
Amalgam- Amalgam is a substance formed by the reaction of mercury with another metal. 
Aqueous- Aqueous means "In a solution of water". An Aqueous solution is a solution in which water is the solvent.
C
Colloid- A colloid is a substance dispersed evenly throughout another substance.
Concentrated- A large quantity of substance present in a unit amount of mixture.
D
Dilute- To dilute a liquid is to make it thinner or weaker by adding water or another solvent to it.
E
Eutectic- Eutectic point is the lowest temperature at which the eutectic mixture can exist in liquid phase.
I
Immiscible- Not forming a homogeneous ...view middle of the document...

Most non-polar molecules are water insoluble, they are hydrophobic at room temperature.
Substance | Soluble/insoluble | Reason |
Salt (NaCl) | Soluble | Polar substance (Na+Cl-) |
Sugar | Soluble | Polar nature |
Oil | Insoluble | Oil is non-polar, water is a polar solvent. |
Nicotine | Soluble | Nicotine is a polar molecule. |
Baking Soda(NaHCO3) | Soluble | Baking Soda is an ionic compound; polar water molecules have a strong attraction to charged ions. |
Calcium carbonate(CaCO3) | Insoluble |  Calcium Carbonate is extremely stable as a solid and water doesn't have enough solvating capability to cause the ions to separate and come into the solution. |
Aluminium | Insoluble | Aluminium is a metal and metals are insoluble unless they react with water. |
Paraffin wax | Insoluble | Non-polar molecular. |
Ethanol | Soluble | Polar molecular, Ethanol contains a (polar) hydroxyl group. |

Part 3
Title: Solubility of 3 common substances in water.
Aim: To determine which of the 3 substances (sugar, table salt and oil) tested are soluble or insoluble in water.
Hypothesis: The salt and sugar will be soluble and the oil will be insoluble.
Equipment:
- Teacups (1 metric cup)
-Water
-Teaspoons
-Sugar
-Table Salt
-Oil
Method:
1. Fill 3 Teacups with water
2. Add one teaspoon of salt to one...

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