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c. Celluloid

d. Colloid

e. Heterogeneous Mixture

24. The following is an appropriate statement of polymer properties in

the nanotechnology chemical industry …
a. PVC is more fire resistant than PE

b. PE is more fire resistant than PVC
c. PVC has weak tensile strength compared to PE

d. PVC is more transparent than PE

e. PE is more heat resistant than PVC

25. Lexan has a high resistance to heat and weather so it is widely used

for …
a. eye contact lenses, LCD screens and coatings

b. upholstery, iron and plastic
c. safety glasses, window frames and helmets

d. yarn material, ceramic coating, plastic material
e. LCD, glass and CD coating materials

26. In research the first step that must be done is …
a. Observation
b. Doing experiments

c. Designing experiments

d. Problem identification
e. Data analysis

27. Consider the following steps of the scientific method.

1) Formulation of hypothesis
2) Data collection

3) Experiment