Chemistry Coursework. Aim: To find out if the thickness of plastic bags is directly correlated to the mass they can hold.

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Year 11 Chemistry

GCSE Additional Science

Internal Assessment

Aim: To find out if the thickness of plastic bags is directly correlated to the mass they can hold.

Apparatus:

* Clamp stand

* Five to Seven plastic bags of a variety of thicknesses

* 100g masses

* Two K-nex rods and four K-nex clips

* Two pieces of string, both measuring approximately 15cm

* Vernia Caliper

* Digital balance

Diagram:

Method:

1. Select a range of five to seven plastic bags, preferably each of a different make and thickness.

2. Measure three, 3cm x 20cm strips on each bag and cut them out.

3. Measure the thickness of one of the strips from each bag using a Vernier Caliper. Then measure the mass using a digital balance

4. Set up the apparatus of a clamp stand and two K-NEX rods, four K-NEX clips and two loops of string.

5. Wrap approximately 1cm of the plastic bag strip around the centre of one K-NEX rod, and secure in place with two clips. Then secure the other end of the strip around the remaining K-NEX