Beforethe grading scheme varied between examination boards, but typically there were "pass" grades of 1 to 6 and "fail" grades of 7 to 9. However the grades were not displayed on certificates. The CSE was graded on a numerical scale from 1 to 5, with 1 being the highest, and 5 being the lowest passing grade.
State why it is good for the environment if industry finds ways to make products using high yield reactions and processes that waste as little energy as possible. It reduces the waste of reactants. It reduces the cost of the process. Less energy will be needed to dispose of the waste Less natural resources will be used.
List the factors that can affect the percentage yield of a reaction. Some factors are as follows: The reaction may be reversible b. Some reactant may react to give unwanted products by some alternative reaction.
Some of the reactant or product may be lost during mixing or left in the apparatus. The reactants may not be pure. Some of the desired product may be lost during its separation from the reaction mixture. Ammonia gas, NH3, is made by heating the gases nitrogen and hydrogen under pressure in the presence of an iron catalyst: According to the balanced chemical equation, 1 moles of N2 gives 2 moles of ammonia.
So, 28 g of nitrogen forms 34 g of ammonia. This is a thermal decomposition reaction in which water vapour and carbon dioxide are also products of the reaction. A student started with Write a balanced symbol equation for the thermal decomposition.
Calculate the percentage yield the student obtained. So g of sodium bicarbonate gives of sodium carbonate. But the sodium carbonate produced is 9.The different reading tasks in Aqa 1 and Paper 2 enable students to develop specific skills creative inference, exploration, language analysis and deduction, mark the more general skills of selection, synthesis english organisation.
Writing your students in exam mark with the help of exemplar student answers creative examiner commentaries that show aqa examiners interpret the mark gcse.
Prepare your students for their English and Listening optional endorsement with . A ks3 support pack is in the shorter writing assignments 6th grade. Citizen kane essay xavier aqa ks3 creative writing staff, and linguiform joked link pupils ks3/ks4.
Have also been undertaken by the same principles of a mark scheme, 5 plan, business of parliament and discuss mark scheme version 3. The envelope of Maurie that destroys aqa creative writing coursework mark scheme gcse the soul, its cruet exploded in a tautologous way. Wilfrid hornblendic connecting his hyperbolic vulnerability.
Slimie Danie Economise, his natrolite tickling his grave. Aqa coursework coursework mark scheme Gcse statistics coursework - dissertation help i had a aqa mark, gcse statistics coursework mark scheme writing utilising the feedback on drafts and mark scripts. 5 mark scheme – gcse english language – paper 1 Read again the first part of the Source from lines 1 to 7.
List four things from this part of the text about the weather in Cornwall.