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Conservation of Mass

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===About Conservation of Mass===
: In a [[Chemical Reaction|chemical reaction]] law of '''conservation of mass''' indicates that the total [[mass]] of the [[product]]s is the same as the total [[mass]] of the [[reactant]]s.
: '''Conservation of mass''' can be [[observed]] in [[Closed System|closed system]]s in which none of the [[product]]s can escape and no other [[chemical]]s enter the [[system]].
: In an [[Open System|open system]] any [[Chemical Reaction|chemical reaction]] which [[product|produces]] a [[gas]] will appear to decrease in [[mass]] but only because the [[mass]] has moved to a different location. The [[particle]]s of [[gas]] escape the container.
===Examples===
{| class="wikitable"
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Find the [[mass]] of [[Calcium OxideOxygen]] needed to completely [[product|producedoxidise]] in all of the following [[Chemical Reaction|reactionMagnesium]]:
CaCO<sub>3</sub> → CaO 2Mg + COO<sub>2</sub>→ 2MgO
25g 48g + x = x + 11gy
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Find the [[mass]] of [[Carbon DioxideOxygen]] needed for the [[productComplete Combustion|producedcomplete combustion]] in the following of [[Chemical Reaction|reactionMethane]]:.
CH<sub>4</sub> + 2O<sub>2</sub> → 2H<sub>2</sub>O + CO<sub>2</sub>
4g 32g + 16g x = 9g + xy
| style="height:20px; width:200px; text-align:center;" |
Find the [[mass]] of [[Hydrochloric Acid]] needed in to completely [[Neutralise (Chemistry)|neutralise]] all of the following [[Chemical Reaction|reactionSodium Hydroxide]]:.
NaOH + HCl → NaCl + H<sub>2</sub>O
160g 20g + x = 234g y + 72gz|-| style="height:20px; width:200px; text-align:center;" |Find the [[Relative Formula Mass]] of the [[reactant]]s. M<sub>r</sub> of Mg = 24g M<sub>r</sub> of O<sub>2</sub> = 16x2 M<sub>r</sub> of O<sub>2</sub> = 32g | style="height:20px; width:200px; text-align:center;" |Find the [[Relative Formula Mass]] of the [[reactant]]s. M<sub>r</sub> of CH<sub>4</sub> = 16g M<sub>r</sub> of O<sub>2</sub> = 16x2 M<sub>r</sub> of O<sub>2</sub> = 32g | style="height:20px; width:200px; text-align:center;" |Find the [[Relative Formula Mass]] of the [[reactant]]s. M<sub>r</sub> of NaOH = 40g M<sub>r</sub> of HCl = 36.5g |-| style="height:20px; width:200px; text-align:center;" |State the [[ratio]] of [[mole]]s of each [[chemical]] needed. 2 [[mole]]s of Mg are needed for every 1 [[mole]] of O<sub>2</sub> | style="height:20px; width:200px; text-align:center;" |State the [[ratio]] of [[mole]]s of each [[chemical]] needed. 1 [[mole]] of CH<sub>4</sub> is needed for every 2 [[mole]]s of O<sub>2</sub> | style="height:20px; width:200px; text-align:center;" |State the [[ratio]] of [[mole]]s of each [[chemical]] needed. 1 [[mole]] of HCl are needed for every 1 [[mole]] of NaOH 
|-
 
| style="height:20px; width:200px; text-align:center;" |
x Find the number of [[mole]]s supplied of the known [[mass]]. No. [[Mole]]s = 25g - 11g<math>\frac{Mass}{M_r}</math> No. [[Mole]]s = <math>\frac{48}{24}</math> No. [[Mole]]s = 2 Mole Therefore 1 [[mole]] of O<sub>2</sub> is needed. 1 [[mole]] of O<sub>2</sub> = 32g
x = 14g
| style="height:20px; width:200px; text-align:center;" |
20g Find the number of [[mole]]s supplied of the known [[mass]]. No. [[Mole]]s = 9g + x<math>\frac{Mass}{M_r}</math> No. [[Mole]]s = <math>\frac{32}{16}</math> No. [[Mole]]s = 2 Mole
x = 20g - 9gTherefore 4 [[mole]]s of O<sub>2</sub> are needed.
x 4 [[mole]]s of O<sub>2</sub> = 11g128g
| style="height:20px; width:200px; text-align:center;" |
160g + x Find the number of [[mole]]s supplied of the known [[mass]]. No. [[Mole]]s = 306g<math>\frac{Mass}{M_r}</math> No. [[Mole]]s = <math>\frac{20}{40}</math> No. [[Mole]]s = 0.5 Mole Therefore 0.5 [[mole]] of HCl is needed.
x 0.5 [[mole]] of HCl = 306g - 160g18.25g
x = 146g
|}
 
==Beyond the Curriculum==
{{#ev:youtube|https://www.youtube.com/watch?v=2S6e11NBwiw}}
 
===References===
====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 ''Conservation of mass, page 181, GCSE Combined Science Trilogy 1, Hodder, AQA '']
:[https://www.amazon.co.uk/gp/product/1782945571/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945571&linkCode=as2&tag=nrjc-21&linkId=9e29fad914244909903e5e93f8a01d91 ''Conservation of mass, page 43, GCSE Chemistry; The Revision Guide, CGP, AQA '']
:[https://www.amazon.co.uk/gp/product/0198359381/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=0198359381&linkCode=as2&tag=nrjc-21&linkId=47c8d1ae58d8b3a5e2094cd447154558 ''Conservation of mass, page 6, GCSE Chemistry; Third Edition, Oxford University Press, AQA '']
:[https://www.amazon.co.uk/gp/product/1471851346/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1471851346&linkCode=as2&tag=nrjc-21&linkId=3ac654f4b0da781c49c855a1af4c92ea ''Conservation of mass, page 68, GCSE Chemistry, Hodder, AQA '']
:[https://www.amazon.co.uk/gp/product/019835939X/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=019835939X&linkCode=as2&tag=nrjc-21&linkId=57e96876985fc39b1a3d8a3e3dc238b6 ''Conservation of mass, page 78, GCSE Physics; Third Edition, Oxford University Press, AQA '']
:[https://www.amazon.co.uk/gp/product/178294639X/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=178294639X&linkCode=as2&tag=nrjc-21&linkId=51599bb45a2bfaf7c1b6a978b2ca2616 ''Conservation of mass, pages 108-110, GCSE Combined Science Trilogy; Chemistry, CGP, AQA '']
:[https://www.amazon.co.uk/gp/product/1782945962/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945962&linkCode=as2&tag=nrjc-21&linkId=476bb5c8d1dfb5c08ac81b6d4d1c98d8 ''Conservation of mass, pages 114- 116, GCSE Chemistry, CGP, 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=ad276ad49df77ab4b40ab4fd0fe09801 ''Conservation of mass, pages 124, 125, 195, GCSE Combined Science; The Revision Guide, CGP, AQA '']
:[https://www.amazon.co.uk/gp/product/0008158770/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=0008158770&linkCode=as2&tag=nrjc-21&linkId=ec31595e720e1529e49876c3866fff6e ''Conservation; of mass, pages 88, 116-17, GCSE Physics; Student Book, Collins, AQA '']
 
====Edexcel====
 
:[https://www.amazon.co.uk/gp/product/1782945725/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945725&linkCode=as2&tag=nrjc-21&linkId=694be7494de75af3349537d34e13f7f0 ''Conservation of mass, apge 26, GCSE Chemistry; 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 ''Conservation of mass, law of, pages 218-219, GCSE Combined Science, Pearson Edexcel '']
:[https://www.amazon.co.uk/gp/product/1292120215/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1292120215&linkCode=as2&tag=nrjc-21&linkId=8f96ddb76196848bafdb124354e4cf77 ''Conservation of mass, law of, pages 74-75, GCSE Chemistry, Pearson, 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 ''Conservation of mass, page 89, GCSE Combined Science; The Revision Guide, CGP, Edexcel '']
:[https://www.amazon.co.uk/gp/product/1782948147/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782948147&linkCode=as2&tag=nrjc-21&linkId=f63dcd8345f4e49c717b39a228a36c7c ''Conservation of mass, pages 74-76, GCSE Chemistry, CGP, Edexcel '']
:[https://www.amazon.co.uk/gp/product/1292120215/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1292120215&linkCode=as2&tag=nrjc-21&linkId=8f96ddb76196848bafdb124354e4cf77 ''Mass conservation, pages 74-75, GCSE Chemistry, Pearson, Edexcel '']
 
====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 ''Conservation of mass, page 107, Gateway GCSE Combined Science; The Revision Guide, CGP, OCR '']
:[https://www.amazon.co.uk/gp/product/1782945679/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945679&linkCode=as2&tag=nrjc-21&linkId=a2db42f7b4bdf10cafaafa3bb9120940 ''Conservation of mass, page 34, GCSE Chemistry; The Revision Guide, CGP, OCR Gateway '']
:[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 ''Law of conservation of mass, pages 90-91, Gateway GCSE Chemistry, Oxford, OCR '']
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