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Topics: Atom, Chemistry, Molecule Pages: 6 (1269 words) Published: October 20, 2013
 Edexcel Level 3 BTEC Nationals in Applied Science (Forensic Science) Unit 01 – Fundamentals of Science
Assignment 01-01, Volumetric Analysis

Date set:Sept 2010
Date due:Oct 2010

This assignment addresses the following Criteria…

Unit 1 – Fundamentals of Science
Assessment and grading criteria
To achieve a pass grade the evidence must show that the learner is able to: To achieve a merit grade the evidence must show that, in addition to the pass criteria, the learner is able to: To achieve a distinction grade the evidence must show that, in addition to the pass and merit criteria, the learner is able to: P1

outline the key features of the periodic table, atomic structure and chemical bonding M1
relate the key features of the periodic table to the conclusions drawn from the practical activities D1
explain how standard solutions and titrations are prepared in industry P2
demonstrate practically the ability to prepare chemical solutions and test their accuracy

Scenario:
You are working as a scientist for ‘Edvisprog’ – a company producing visual aids for education. The team is currently working on a web-based program to help students understand the key features of the periodic table and information to guide students to help the teaching and understanding of the use of titrations. You have to produce word documents or powerpoint presentations that will provide the information for the web-based software.

Remember:
During this (and other assignments) credit cannot be given for a diagram copied from the internet unless, (1) It is referenced and (2) You have interpreted the diagram in some way, for example, added your own labels or further described the concept conveyed in the diagram. Task 1 – Chemical Bonding and the Periodic Table

In this task you have to describe atomic structure, outline the key features of the periodic table and describe chemical bonding

Draw a diagram of a Calcium atom, label the key components of the atom. P1i

The periodic table contains over 100 different elements in a specific order. Describe how the atoms in the periodic table are arranged. You will need to make reference to (a) groups, (b) periods, (c) metals and non-metals, (d) solids/liquids/gases. Choose three different elements and explain why each is in a particular group / period P1ii

Ionic, covalent and hydrogen are the three main types of chemical bonding. Draw a series of diagrams, with explanations to outline the process involved in each type. P1iii

Task 2 – Volumetric Analysis
This task will require you to make a ‘Standard Solution’, this is a solution of known strength. You will make a solution of sodium carbonate. The strength of sodium carbonate (Na2CO3) is usually measured in moles. A one molar (1M) solution means one mole of substance (solute) per litre of solution. A mole is the molecular mass of a substance in grams. To calculate the molecular mass, the atomic masses of all the atoms in the molecule need to be added together. For example, the sodium carbonate molecule consists of one atom each of sodium (Na), carbon (C), and oxygen (O). Their respective atomic weights are: Na - 23,C - 12 and O - 16, so the molecular weight, is 23 + 23+ 12 + 16 + 16 + 16 = 106. Thus 106 grams of Na2CO3 equals one mole of Na2CO3, and a 1 molar solution of Na2CO3will contain 106 grams of Na2CO3chemical, per litre of water.

Using all the safety measures required, make a ‘Standard Solution’ of sodium carbonate. It can be any strength you like (within reason!) but you must know the strength exactly.

This part of the task will be assessed by the teacher.
P2i

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

Procedure…
1. Rinse all equipment with distilled water
2. Using a pipette add 25 cm3 of Na2CO3 to a conical flask
3. Add 3 or 4 drops of phenolphthalein. The solution will turn pink. 4. Fill the burette with Hydrochloric acid....
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