a) Describe the process of making silk.
b) (i) Distinguish between physical and chemical changes.
Answers
Explanation:
if a substance or matter we can measure or observed without changing their properties is called physical change...
one the other hand, if a substance or matter we can not measure or observed without changing their properties is called chemical change...
chemical change example are milk
physical change example are water
Explanation:
a) 1. Sericulture
This is the term used to describe the process of gathering the silkworms and harvesting the cocoon to collect the materials.
2. Thread extraction
Once the silkworms have spun their cocoon, they will eventually enclose themselves inside it and then it’s time to extract the silk threads.
3. Dyeing
When the silk threads have been washed and degummed, they will be bleached and dried before the dyeing process commences.
4. Spinning
The traditional spinning wheel has always, and will always be an integral part of the silk production process. Although updated industrial processes are now able to spin silk threads much quicker, it simply mimics the functions of the classic spinning wheel.
5. Weaving
Weaving is the process in which the final piece of silk comes together. There are many different ways in which silk can be woven – satin weave, plain weave and open weave are most common, and the finish of the silk will depend on the type of weave.
6.Printing
Should a piece of silk require a special pattern or design, it will need to be printed after pre-treatment. This can be done in two different ways: Digital Printing or Screen Printing.
. Finishing
In order to be deemed ready for use, silks must be finished. Finishing a piece of silk gives it that highly lustrous sheen that it is so commonly known for, and is the reason that the desired look and feel can be achieved.
hope it helps you...