19,879
edits
Changes
no edit summary
==Key Stage 3==
===Meaning===
[[Lipid]]s are molecules [[molecule]]s found in fats and oils.
===About Lipids===
| style="height:20px; width:200px; text-align:center;" |Butter is full of fat and we shouldn't eat too much. Butter is found in cakes and cookies.
| style="height:20px; width:200px; text-align:center;" |Cooking oil is used to fry our food causing it to have a lot of oil inside it. A small amount is healthy but too much is bad for us.
|}
===Testing For Lipids===
: Adding [[lipid]]s to paper can turn the paper [[translucent]].
=====The Paper Test Method=====
: 1. Take a small sample of food.
: 2. Wipe it on a piece of paper.
: 3. Hold the paper up to the light.
: 4. If the paper has turned [[translucent]] the food contained [[lipid]]s.
{| class="wikitable"
|-
|[[File:FatTest.png|center|600px]]
|-
| style="height:20px; width:600px; text-align:center;" |There are two patches where fat has been asborbed by the paper.
|}
=====The Alcohol Emulsion Test Method=====
: 1. Take a small sample of food.
: 2. Place the food in [[ethanol]] and mix by shaking or stirring.
: 3. [[Filter]] the [[mixture]].
: 4. Add the clear [[solution]] to some water.
: 5. If lipids are present then a white [[emulsion]] will appear.
{| class="wikitable"
|-
|[[File:AlcoholEmulsionTest.png|center|600px]]
|-
| style="height:20px; width:600px; text-align:center;" |The mixture on the right shows the presence of [[lipid]]s.
|}
==Key Stage 4==
===Meaning===
[[Lipid]]s are [[molecule]]s, made of a [[glycerol]] head and 3 [[Fatty Acid|fatty acid]] tails, that is found in fats and oils.
===About Lipids===
: [[Lipid]]s are an essential [[nutrient]] in our [[diet]] that is used in our [[Nervous System|nervous system]].
: [[Lipid]]s store [[Chemical Potential Energy Store|chemical energy]] at a higher [[energy]] density than [[carbohydrate]]s so the body stores extra [[energy]] in [[Fatty Tissue|fatty tissue]] made of [[lipid]]s.
: If there are too much [[lipid]]s in our [[diet]] then we can become [[Obesity|obese]].
: [[Lipid]]s are broken down by our [[Digestive System|digestive system]] into a [[glycerol]] head and 3 [[Fatty Acid|fatty acid]] tails.
: The [[Fatty Acid|fatty acids]] in [[lipid]]s can be many different lengths.
{| class="wikitable"
|-
|[[File:LipidDiagram.png|center|500px]]
|-
| style="height:20px; width:600px; text-align:center;" |This [[diagram]] shows a simple representation of a [[lipid]].
|}