Section A: Answer ALL questions in this Section. Write your answers in the spaces provided. 1.
(a)
An experiment was carried out in the laboratory during a Chemistry lesson. A
drop of bromine was added to gas jar A. Immediately, another gas jar B was
placed above it as shown in the diagram below.
Comment on:
The concentration of bromine in gas jar A and gas jar B at the start of the
experiment.

Answer(d) unstable compounds that convert to acetals in the presence of alcohol and an acid; (b) semiacetals produced by alcohol subtraction from ketone;

The answer is 3.

Polyethylene is a strong synthetic polymer that can be used to make toys and bottles. this makes plastics which are important also to people but sometimes it lead to harmful environmental effects such as global warming if these plastics are burned.

For lesson: cameras, plant presses, newspaper, paper towels, clip boards, pencils, calculators, field guides, metric measuring tapes, paper, transect squares, colored pencils, ph meters, light meters, computers, etc.for extension: baggies for soil samples collecting, distilled water, hand shovels, beakers, boiled rice, microscopes, well microscope slides or regular microscope slides with cover slips