Diffusion - Revision history

Ellen References at 15:38, 4 December 2019

2019-12-04T15:38:15Z

Ellen References at 15:08, 17 November 2019

2019-11-17T15:08:14Z

Ellen References at 09:07, 4 November 2019

2019-11-04T09:07:57Z

NRJC at 08:48, 5 June 2019

2019-06-05T08:48:51Z

NRJC: /* Key Stage 4 */

2019-06-05T08:45:06Z

‎Key Stage 4

NRJC: /* Lungs */

2018-11-08T20:48:01Z

‎Lungs

NRJC at 20:46, 8 November 2018

2018-11-08T20:46:16Z

NRJC: /* Meaning */

2018-11-05T11:27:10Z

‎Meaning

NRJC: /* Small Intestine */

2018-11-05T11:26:59Z

‎Small Intestine

NRJC at 11:07, 5 November 2018

2018-11-05T11:07:59Z

← Older revision		Revision as of 15:38, 4 December 2019
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	:[https://www.amazon.co.uk/gp/product/1782946748/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782946748&linkCode=as2&tag=nrjc-21&linkId=a4f0348fc37d0ba1bb52d27f8679581f ''Diffusion; factors affecting rate, page 88, GCSE Biology; The Revision Guide, CGP, Edexcel '']		:[https://www.amazon.co.uk/gp/product/1782946748/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782946748&linkCode=as2&tag=nrjc-21&linkId=a4f0348fc37d0ba1bb52d27f8679581f ''Diffusion; factors affecting rate, page 88, GCSE Biology; The Revision Guide, CGP, Edexcel '']
	:[https://www.amazon.co.uk/gp/product/1292120207/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1292120207&linkCode=as2&tag=nrjc-21&linkId=22455ff53961978667722edaa64c0be5 ''Diffusion; factors affecting, pages 164-165, GCSE Biology, Pearson, Edexcel '']		:[https://www.amazon.co.uk/gp/product/1292120207/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1292120207&linkCode=as2&tag=nrjc-21&linkId=22455ff53961978667722edaa64c0be5 ''Diffusion; factors affecting, pages 164-165, GCSE Biology, Pearson, Edexcel '']
		+
		+	====OCR====
		+	:[https://www.amazon.co.uk/gp/product/0198359829/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=0198359829&linkCode=as2&tag=nrjc-21&linkId=90e8d7b4f039d53035238fa0320fe00b ''Diffusion, page 123, Gateway GCSE Chemistry, Oxford, OCR '']
		+	:[https://www.amazon.co.uk/gp/product/1782945695/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945695&linkCode=as2&tag=nrjc-21&linkId=ceafcc80bcad6b6754ee97a0c7ceea53 ''Diffusion, page 25, Gateway GCSE Combined Science; The Revision Guide, CGP, OCR '']
		+	:[https://www.amazon.co.uk/gp/product/1782945660/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945660&linkCode=as2&tag=nrjc-21&linkId=83aa4500ad7759e7f401a1c5ba5df758 ''Diffusion, pages 30, 33, Gateway GCSE Biology; The Revision Guide, CGP, OCR '']
		+	:[https://www.amazon.co.uk/gp/product/0198359810/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=0198359810&linkCode=as2&tag=nrjc-21&linkId=d768d99f1a06f7c12fab40e5aef85a55 ''Diffusion, pages 58-59, 72-73, Gateway GCSE Biology, Oxford, OCR '']

← Older revision		Revision as of 15:08, 17 November 2019
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	:[https://www.amazon.co.uk/gp/product/1471851354/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1471851354&linkCode=as2&tag=nrjc-21&linkId=9012a0d354024419214fb3ad5ac44ba0 ''Diffusion; in the lungs, page 30, GCSE Combined Science Trilogy 1, Hodder, AQA '']		:[https://www.amazon.co.uk/gp/product/1471851354/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1471851354&linkCode=as2&tag=nrjc-21&linkId=9012a0d354024419214fb3ad5ac44ba0 ''Diffusion; in the lungs, page 30, GCSE Combined Science Trilogy 1, Hodder, AQA '']
	:[https://www.amazon.co.uk/gp/product/1471851354/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1471851354&linkCode=as2&tag=nrjc-21&linkId=9012a0d354024419214fb3ad5ac44ba0 ''Diffusion; influencing factors, pages 32-3, GCSE Combined Science Trilogy 1, Hodder, AQA '']		:[https://www.amazon.co.uk/gp/product/1471851354/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1471851354&linkCode=as2&tag=nrjc-21&linkId=9012a0d354024419214fb3ad5ac44ba0 ''Diffusion; influencing factors, pages 32-3, GCSE Combined Science Trilogy 1, Hodder, AQA '']
		+
		+	====Edexcel====
		+
		+	:[https://www.amazon.co.uk/gp/product/1782948120/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782948120&linkCode=as2&tag=nrjc-21&linkId=dedef775c6a43dbb0a609441525adac0 ''Diffusion, factors affecting rate, page 258, GCSE Biology, CGP, Edexcel '']
		+	:[https://www.amazon.co.uk/gp/product/1782945741/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945741&linkCode=as2&tag=nrjc-21&linkId=30da4f2178da182547b62a7329d13b57 ''Diffusion, page 18, GCSE Combined Science; The Revision Guide, CGP, Edexcel '']
		+	:[https://www.amazon.co.uk/gp/product/1782946748/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782946748&linkCode=as2&tag=nrjc-21&linkId=a4f0348fc37d0ba1bb52d27f8679581f ''Diffusion, page 21, GCSE Biology; The Revision Guide, CGP, Edexcel '']
		+	:[https://www.amazon.co.uk/gp/product/1292120193/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1292120193&linkCode=as2&tag=nrjc-21&linkId=572df39392fb4200db8391d98ae6314e ''Diffusion, pages 20, 92-93, 112, GCSE Combined Science, Pearson Edexcel '']
		+	:[https://www.amazon.co.uk/gp/product/1292120207/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1292120207&linkCode=as2&tag=nrjc-21&linkId=22455ff53961978667722edaa64c0be5 ''Diffusion, pages 24, 130-131, 162, GCSE Biology, Pearson, Edexcel '']
		+	:[https://www.amazon.co.uk/gp/product/1782948120/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782948120&linkCode=as2&tag=nrjc-21&linkId=dedef775c6a43dbb0a609441525adac0 ''Diffusion, pages 48, 49, GCSE Biology, CGP, Edexcel '']
		+	:[https://www.amazon.co.uk/gp/product/1782946748/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782946748&linkCode=as2&tag=nrjc-21&linkId=a4f0348fc37d0ba1bb52d27f8679581f ''Diffusion; factors affecting rate, page 88, GCSE Biology; The Revision Guide, CGP, Edexcel '']
		+	:[https://www.amazon.co.uk/gp/product/1292120207/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1292120207&linkCode=as2&tag=nrjc-21&linkId=22455ff53961978667722edaa64c0be5 ''Diffusion; factors affecting, pages 164-165, GCSE Biology, Pearson, Edexcel '']

← Older revision		Revision as of 09:07, 4 November 2019
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	\| style="height:20px; width:600px; text-align:center;" \|This animation shows a high [[concentration]] of red [[particle]]s initially at the top. When [[diffusion]] begins the red [[particle]]s spread to the area of lower [[concentration]] at the bottom. [[Diffusion]] continues until all [[particle]]s are equally spread.		\| style="height:20px; width:600px; text-align:center;" \|This animation shows a high [[concentration]] of red [[particle]]s initially at the top. When [[diffusion]] begins the red [[particle]]s spread to the area of lower [[concentration]] at the bottom. [[Diffusion]] continues until all [[particle]]s are equally spread.
	\|}		\|}
		+
		+	===References===
		+	====AQA====
		+
		+	:[https://www.amazon.co.uk/gp/product/1782945954/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945954&linkCode=as2&tag=nrjc-21&linkId=100574c08fbbb64318256eb79ed61a76 ''Diffusion pages 51-53, GCSE Biology, CGP, AQA '']
		+	:[https://www.amazon.co.uk/gp/product/0198359373/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=0198359373&linkCode=as2&tag=nrjc-21&linkId=952a73bbb09d222ecc4b50d200679849 ''Diffusion, pages 14-15, 61, 188-189, GCSE Biology; Third Edition, Oxford University Press, AQA '']
		+	:[https://www.amazon.co.uk/gp/product/1782945598/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945598&linkCode=as2&tag=nrjc-21&linkId=ad276ad49df77ab4b40ab4fd0fe09843 ''Diffusion, pages 17, 20, 21, GCSE Combined Science; The Revision Guide, CGP, AQA '']
		+	:[https://www.amazon.co.uk/gp/product/1782945563/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945563&linkCode=as2&tag=nrjc-21&linkId=9a1d023a374038e6072f33c4f3cf808b ''Diffusion, pages 20, 21, 23-25, GCSE Biology; The Revision Guide, CGP, AQA '']
		+	:[https://www.amazon.co.uk/gp/product/0008158754/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=0008158754&linkCode=as2&tag=nrjc-21&linkId=27ad53b0283feeff7fc5ae04a9e205f221 ''Diffusion, pages 44-5, 55, 68-9, 86-7. 92, 94-5, 101, 106-7, 113, 117, 204, GCSE Biology; Student Book, Collins, AQA '']
		+	:[https://www.amazon.co.uk/gp/product/1782946381/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782946381&linkCode=as2&tag=nrjc-21&linkId=5ec5fc3f6429e30c1d9ab9bca2bccf93 ''Diffusion, pages 45-47, GCSE Combined Science Trilogy; Biology, CGP, AQA '']
		+	:[https://www.amazon.co.uk/gp/product/1471851338/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1471851338&linkCode=as2&tag=nrjc-21&linkId=425855d5890466e47189e1c21b67a1ea ''Diffusion, pages 5, 28, 29-33, GCSE Biology, Hodder, AQA '']
		+	:[https://www.amazon.co.uk/gp/product/1471851354/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1471851354&linkCode=as2&tag=nrjc-21&linkId=9012a0d354024419214fb3ad5ac44ba0 ''Diffusion, pages 5, 29, GCSE Combined Science Trilogy 1, Hodder, AQA '']
		+	:[https://www.amazon.co.uk/gp/product/1471851354/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1471851354&linkCode=as2&tag=nrjc-21&linkId=9012a0d354024419214fb3ad5ac44ba0 ''Diffusion; in other organisms, pages 31-2, GCSE Combined Science Trilogy 1, Hodder, AQA '']
		+	:[https://www.amazon.co.uk/gp/product/1471851354/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1471851354&linkCode=as2&tag=nrjc-21&linkId=9012a0d354024419214fb3ad5ac44ba0 ''Diffusion; in the lungs, page 30, GCSE Combined Science Trilogy 1, Hodder, AQA '']
		+	:[https://www.amazon.co.uk/gp/product/1471851354/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1471851354&linkCode=as2&tag=nrjc-21&linkId=9012a0d354024419214fb3ad5ac44ba0 ''Diffusion; influencing factors, pages 32-3, GCSE Combined Science Trilogy 1, Hodder, AQA '']

@@ Line 4: / Line 4: @@
 ===About Diffusion===
-: [[Diffusion]] can only happen in a [[fluid]] which means a [[liquid]] or a [[gas]] because the [[particle]]s can move past each other.
+: [[Diffusion]] can only happen in a [[fluid]] (a [[liquid]] or a [[gas]]) because the [[particle]]s can move past each other.
 : [[Diffusion]] cannot happen in a [[solid]] because the [[particle]]s are held in fixed positions.
-: In [[diffusion]] the particles always spread from a high [[concentration]] where there is lots of the substance, to a low [[concentration]] where there is less of the substance.
+: In [[diffusion]] the [[particle]]s always spread from a high [[concentration]] (where there are lots of the [[particle]]s, to a low [[concentration]] (where there are less of the [[particle]]s).
 {| class="wikitable"
@@ Line 25: / Line 24: @@
 ==Key Stage 4==
 ===Meaning===
-[[Diffusion]] is when [[substance]]s spread from a high [[concentration]] to a low [[concentration]] along the [[Concentration Gradient|concentration gradient]].
+[[Diffusion]] is when [[particle]]s spread from a region of high [[concentration]] to a region of low [[concentration]] along a [[Concentration Gradient|concentration gradient]].

← Older revision		Revision as of 08:45, 5 June 2019
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	===Meaning===		===Meaning===
	[[Diffusion]] is when [[substance]]s spread from a high [[concentration]] to a low [[concentration]] along the [[Concentration Gradient\|concentration gradient]].		[[Diffusion]] is when [[substance]]s spread from a high [[concentration]] to a low [[concentration]] along the [[Concentration Gradient\|concentration gradient]].
−
−	~~===About Diffusion across a Membrane===~~
−	~~: [[Diffusion]] in [[Cell (Biology)\|cells]] is a passive process which means it does not require [[energy]] to take place.~~
−	: When [[Cell (Biology)\|cells]] are surrounded by a high [[concentration]] of a [[nutrient]] then the [[nutrient]] will [[Diffusion\|diffuse]] through the [[Cell Membrane\|cell membrane]] and into the [[Cell (Biology)\|cells]].
−	~~: When a [[Cell (Biology)\|cell]] has filled with a large number of waste [[chemical]]s they will [[Diffusion\|diffuse]] through the [[Cell Membrane\|cell membrane]] out of the [[Cell (Biology)\|cell]].~~
−
−	~~===Factors Affecting Diffusion across a Membrane===~~
−	*[[Surface Area]] - The larger the [[Surface Area\|surface area]] the more quickly [[diffusion]] can take place across the [[membrane]].
−	*Thickness - The thinner the [[membrane]] the more quickly [[diffusion]] can take place across the [[membrane]].
−	*[[Concentration Gradient]] - The greater the difference between the [[concentration]] on each side of the [[membrane]] the more quickly [[diffusion]] can take place across the [[membrane]].
−
−	~~===Adaptations for Diffusion===~~
−	~~: The [[lung]]s and [[Small Intestine\|small intestine]] are specially [[Adaptation\|adapted]] exchange surfaces that maximise the rate of [[diffusion]].~~
−	~~====Lungs====~~
−	~~The [[lung]]s must be able to [[Absorb (Biology)\|absorb]] [[Oxygen]] into the [[blood]] and release [[Carbon Dioxide]] from the [[blood]] back into the [[lung]]s.~~
−	~~: The [[lung]]s are [[Adaptation\|adapted]] with thousands of [[alveoli]] which increase the surface area of the [[lung]]s.~~
−	~~: The walls of the [[alveoli]] separating the [[air]] from the of [[blood]] are very thin.~~
−	: The [[blood]] supply to the [[lung]]s is very good to constantly supply [[blood]] with little [[Oxygen]] and a lot of [[Carbon Dioxide]] keeping a high [[Concentration Gradient\|concentration gradient]].
−
−	~~====Small Intestine====~~
−	~~: The [[Small Intestine]] is long and folded to increase the [[Surface Area\|surface area]].~~
−	~~: The [[Small Intestine]] has structures called [[Villi]] which are extra folds in the surface to increase the [[Surface Area\|surface area]].~~
−	~~: The [[Cell (Biology)\|cells]] on the [[villi]] have [[microvilli]] which are folds on the [[Cell Membrane\|cell membrane]] to increase the [[Surface Area\|surface area]].~~
−	~~: The walls of the [[villi]] separating the food from the [[blood]] are very thin.~~
−	: The [[blood]] supply to the [[villi]]s is very good to constantly supply [[blood]] with little [[nutrients]] keeping a high [[Concentration Gradient\|concentration gradient]] between the food and the [[blood]].

@@ Line 42: / Line 42: @@
 The [[lung]]s must be able to [[Absorb (Biology)|absorb]] [[Oxygen]] into the [[blood]] and release [[Carbon Dioxide]] from the [[blood]] back into the [[lung]]s.
 : The [[lung]]s are [[Adaptation|adapted]] with thousands of [[alveoli]] which increase the surface area of the [[lung]]s.
-: The walls of the [[alveoli]] separating the [[air]] from the [[blood]] are very thin.
+: The walls of the [[alveoli]] separating the [[air]] from the of [[blood]] are very thin.
 : The [[blood]] supply to the [[lung]]s is very good to constantly supply [[blood]] with little [[Oxygen]] and a lot of [[Carbon Dioxide]] keeping a high [[Concentration Gradient|concentration gradient]].

@@ Line 1: / Line 1: @@
 ==Key Stage 3==
 ===Meaning===
-[[Diffusion]] is when [[particles]] spread from a region of high [[concentration]] to a region of low [[concentration]].
+[[Diffusion]] is when [[particle]]s spread from a region of high [[concentration]] to a region of low [[concentration]].
 ===About Diffusion===

@@ Line 49: / Line 49: @@
 : The [[Small Intestine]] has structures called [[Villi]] which are extra folds in the surface to increase the [[Surface Area|surface area]].
 : The [[Cell (Biology)|cells]] on the [[villi]] have [[microvilli]] which are folds on the [[Cell Membrane|cell membrane]] to increase the [[Surface Area|surface area]].
-: : The walls of the [[villi]] separating the food from the [[blood]] are very thin.
+: The walls of the [[villi]] separating the food from the [[blood]] are very thin.
 : The [[blood]] supply to the [[villi]]s is very good to constantly supply [[blood]] with little [[nutrients]] keeping a high [[Concentration Gradient|concentration gradient]] between the food and the [[blood]].

← Older revision		Revision as of 11:07, 5 November 2018
Line 22:		Line 22:
	\| style="height:20px; width:600px; text-align:center;" \|This animation shows a high [[concentration]] of red [[particle]]s initially at the top. When [[diffusion]] begins the red [[particle]]s spread to the area of lower [[concentration]] at the bottom. [[Diffusion]] continues until all [[particle]]s are equally spread.		\| style="height:20px; width:600px; text-align:center;" \|This animation shows a high [[concentration]] of red [[particle]]s initially at the top. When [[diffusion]] begins the red [[particle]]s spread to the area of lower [[concentration]] at the bottom. [[Diffusion]] continues until all [[particle]]s are equally spread.
	\|}		\|}
		+
		+	==Key Stage 4==
		+	===Meaning===
		+	'''[[Diffusion]] is when [[substance]]s spread from a high [[concentration]] to a low [[concentration]] along the [[Concentration Gradient\|concentration gradient]].
		+
		+	===About Diffusion across a Membrane===
		+	: [[Diffusion]] in [[Cell (Biology)\|cells]] is a passive process which means it does not require [[energy]] to take place.
		+	: When [[Cell (Biology)\|cells]] are surrounded by a high [[concentration]] of a [[nutrient]] then the [[nutrient]] will [[Diffusion\|diffuse]] through the [[Cell Membrane\|cell membrane]] and into the [[Cell (Biology)\|cells]].
		+	: When a [[Cell (Biology)\|cell]] has filled with a large number of waste [[chemical]]s they will [[Diffusion\|diffuse]] through the [[Cell Membrane\|cell membrane]] out of the [[Cell (Biology)\|cell]].
		+
		+	===Factors Affecting Diffusion across a Membrane===
		+	*[[Surface Area]] - The larger the [[Surface Area\|surface area]] the more quickly [[diffusion]] can take place across the [[membrane]].
		+	*Thickness - The thinner the [[membrane]] the more quickly [[diffusion]] can take place across the [[membrane]].
		+	*[[Concentration Gradient]] - The greater the difference between the [[concentration]] on each side of the [[membrane]] the more quickly [[diffusion]] can take place across the [[membrane]].
		+
		+	===Adaptations for Diffusion===
		+	: The [[lung]]s and [[Small Intestine\|small intestine]] are specially [[Adaptation\|adapted]] exchange surfaces that maximise the rate of [[diffusion]].
		+	====Lungs====
		+	The [[lung]]s must be able to [[Absorb (Biology)\|absorb]] [[Oxygen]] into the [[blood]] and release [[Carbon Dioxide]] from the [[blood]] back into the [[lung]]s.
		+	: The [[lung]]s are [[Adaptation\|adapted]] with thousands of [[alveoli]] which increase the surface area of the [[lung]]s.
		+	: The walls of the [[alveoli]] separating the [[air]] from the [[blood]] are very thin.
		+	: The [[blood]] supply to the [[lung]]s is very good to constantly supply [[blood]] with little [[Oxygen]] and a lot of [[Carbon Dioxide]] keeping a high [[Concentration Gradient\|concentration gradient]].
		+
		+	====Small Intestine====
		+	: The [[Small Intestine]] is long and folded to increase the [[Surface Area\|surface area]].
		+	: The [[Small Intestine]] has structures called [[Villi]] which are extra folds in the surface to increase the [[Surface Area\|surface area]].
		+	: The [[Cell (Biology)\|cells]] on the [[villi]] have [[microvilli]] which are folds on the [[Cell Membrane\|cell membrane]] to increase the [[Surface Area\|surface area]].
		+	: : The walls of the [[villi]] separating the food from the [[blood]] are very thin.
		+	: The [[blood]] supply to the [[villi]]s is very good to constantly supply [[blood]] with little [[nutrients]] keeping a high [[Concentration Gradient\|concentration gradient]] between the food and the [[blood]].