Assessment and grading criteria Essay

Unit of measurement 1 – Fundamentalss of Science
Appraisal and scaling standards
To accomplish a base on balls grade the grounds must demo that the scholar is able to: To accomplish a virtue grade the grounds must demo that. in add-on to the base on balls standard. the scholar is able to: To accomplish a differentiation grade the grounds must demo that. in add-on to the base on balls and virtue standards. the scholar is able to: P1

outline the cardinal characteristics of the periodic tabular array. atomic construction and chemical bonding M1brelate the cardinal characteristics of the periodic tabular array to the decisions drawn from the practical activities D1vexplain how standard solutions and titrations are prepared in industry P2vdemonstrate practically the ability to fix chemical solutions and prove their truth

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Scenario:
You are working as a scientist for ‘Edvisprog’ – a company bring forthing ocular AIDSs for instruction. The squad is presently working on a web-based plan to assist pupils understand the cardinal characteristics of the periodic tabular array and information to steer pupils to assist the instruction and apprehension of the usage of titrations. You have to bring forth word paperss or powerpoint presentations that will supply the information for the web-based package.

Remember:
During this ( and other assignments ) recognition can non be given for a diagram copied from the cyberspace unless. ( 1 ) It is referenced and ( 2 ) You have interpreted the diagram in some manner. for illustration. added your ain labels or farther described the construct conveyed in the diagram. Task 1 – Chemical Bonding and the Periodic Table

In this undertaking you have to depict atomic construction. sketch the cardinal characteristics of the periodic tabular array and depict chemical bonding

Pull a diagram of a Calcium atom. label the cardinal constituents of the atom. P1i

The periodic tabular array contains over 100 different elements in a specific order. Describe how the atoms in the periodic tabular array are arranged. You will necessitate to do mention to ( a ) groups. ( B ) periods. ( degree Celsius ) metals and non-metals. ( vitamin D ) solids/liquids/gases. Choose three different elements and explicate why each is in a peculiar group / period P1ii

Ionic. covalent and H are the three chief types of chemical bonding. Pull a series of diagrams. with accounts to sketch the procedure involved in each type. P1iii

Undertaking 2 – Volumetric Analysis
This undertaking will necessitate you to do a ‘Standard Solution’ . this is a solution of known strength. You will do a solution of Na carbonate. The strength of Na carbonate ( Na2CO3 ) is normally measured in moles. A one grinder ( 1M ) solution means one mole of substance ( solute ) per liter of solution. A mole is the molecular mass of a substance in gms.

To cipher the molecular mass. the atomic multitudes of all the atoms in the molecule demand to be added together. For illustration. the Na carbonate molecule consists of one atom each of Na ( Na ) . C ( C ) . and O ( O ) . Their several atomic weights are: Na – 23. C – 12 and O – 16. so the molecular weight. is 23 + 23+ 12 + 16 + 16 + 16 = 106. Therefore 106 gms of Na2CO3 peers one mole of Na2CO3. and a 1 molar solution of Na2CO3will contain 106 gms of Na2CO3chemical. per liter of H2O.

Using all the safety steps required. do a ‘Standard Solution’ of Na
carbonate. It can be any strength you like ( within ground! ) but you must cognize the strength precisely.

This portion of the undertaking will be assessed by the instructor.
P2i

You will now utilize your standard solution to cipher the strength of a sample of HCl ( Hydrochloric Acid ) .

Procedure…
1. Rinse all equipment with distilled H2O
2. Using a pipette add 25 cm3 of Na2CO3 to a conelike flask
3. Add 3 or 4 beads of phenolphthalein. The solution will turn pink. 4. Fill the burette with Hydrochloric acid.
5. Add acid to the base. observe how much acid is needed to neutralize the Na carbonate. the solution will turn clear ( to the nearest 1cm3 ) 6. Repeat the experiment a farther three times. this clip being accurate to 0. 1 cm3 7. Take the norm of the acid needed ( from the three experiments in the old measure ) .

P2ii
Calculate the strength of the acid utilizing the undermentioned information…

Na2CO3 + HCl ? NaHCO3 + NaCl
At equilibrium: Gram molecules of Na2CO3 = Moles of HCl ( as they react in a 1:1 ratio )

Molarity of HCl ( moles per liter ) ten Volume of HCl ( liters ) = Molarity of Na2CO3 ( moles per liter ) ten Volume of Na2CO3 ( liters )

Molarity of HCl ( moles per liter ) = Molarity of Na2CO3 ( moles per liter ) ten Volume of Na2CO3 ( litres or milliliter )
Volume of HCl ( litres or milliliter )
P2iii
M1i

Undertaking 3 – Further Calculations

This undertaking requires you to farther understand and depict the molecular alterations from the old experiment. The experiment reacted Na2CO3 with HCl to do NaCl and H2O. 1. Explain what makes HCl an acid/

2. Explain what makes Na2CO3 an base. when dissolved in H2O? The diagram of Sodium carbonate may assist you to explicate this

3. Why does the H ( H ) form a positive ion in a hydrochloric acid solution? 4. When acids and bases react they form a salt. explicate why a salt ( in this instance NaCl ) is a really stable compound? 5. Explain why Sodium is in group 1. period 3 and Chlorine is in group 7. period 3. M1ii

Explain in item how you prepared your base solution. including the computations. D1i

Undertaking 4 – Titrations in Industry
Standard solutions are used in the chemical industry to step and look into the strength of chemicals. One peculiar illustration is the transition of WVO ( waste vegetable oil ) into biofuel for Diesel engines. The pH of WVO needs to be altered so it is about 8. 5. which is the same as normal Diesel.

Explain how the pH of WVO is measured in an industrial scene and why the pH must be accurately determined. The undermentioned web sites may be utile:
hypertext transfer protocol: //en. wikipedia. org/wiki/Titration
hypertext transfer protocol: //alternativefuels. about. com/od/biodiesel/a/bdtitration. htm D1ii
Edexcel Level 3 BTEC Nationals in Applied Science ( Forensic Science ) Name………………………… . Unit 01 – Fundamentalss of Science
Assignment 01-01. Volumetric Analysis

Unit of measurement 1 – Fundamentalss of Science
Appraisal and rating standards To accomplish a base on balls grade the grounds must demo that the scholar is able to: To accomplish a virtue grade the grounds must demo that. in add-on to the base on balls standard. the scholar is able to: To accomplish a differentiation grade the grounds must demo that. in add-on to the base on balls and virtue standards. the scholar is able to: P1

outline the cardinal characteristics of the periodic tabular array. atomic construction and chemical bonding M1 relate the cardinal characteristics of the periodic tabular array to the decisions drawn from the practical activities D1 explicate how standard solutions and titrations are prepared in industry P2 demonstrate practically the ability to fix chemical solutions and prove their truth

Taging Grid:
Undertaking 1 – Chemical Bonding and the Periodic Table
P1i
Labelled diagram of atom
Yes / No

P1ii
Key characteristics of periodic tabular array
Yes / No

P1iii
Key characteristics of chemical bonding
Yes / No
Feedback:

Undertaking 2 – Volumetric Analysis
P2i
Experiment conducted safely
Yes / No

P2ii
Basic consequences from experiment obtained
Yes / No

P2iii/M1i
Molarity of HCl calculated
Yes / No
Feedback:

Undertaking 3 – Further Calculations
M1ii
Questions answered about acids. bases and the periodic table Yes / No

D1i
Explained how standard solution was made. including computations Yes / No
Feedback:

Undertaking 4 – Titrations in Industry
D1ii
Describe the titration of WVO and the subsequent deductions Yes / No
Feedback:

Standards Awarded:
P1
P2
M1
D1
Date:

Student Response to Feedback: Date:

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