Question

F. GIVE REASONS FOR THE FOLLOWING :
1. Practicals are very important in chemistry.
2. Chemistry is essential for human life.
3. Dishes used for evaporating substances are made of porcelain.
4. Test tubes are made of glass.​

Answer 1

Ans 1)


These 'hands-on' activities support the development of practical skills, and help to shape students' understanding of scientific concepts and phenomena. ... A further consequence of experiencing practical work, particularly in chemistry, is the acquisition of an understanding of hazard, risk and safe working.



Ans 2)

Chemistry is important because it helps you identify toxic or dangerous substances. Of course, labeling your chemicals helps a lot too. Chemistry [has] great importance in our daily life... In our [bodies,] chemical reactions are going on.




Ans 3)

Evaporating dishes are used to evaporate excess solvents – most commonly water – to produce a concentrated solution or a solid precipitate of the dissolved substance. Most are made of porcelain or borosilicate glass.


Ans 4)


Test tubes intended for general chemical work are usually made of glass, for its relative resistance to heat. Tubes made from expansion-resistant glasses, mostly borosilicate glass or fused quartz, can withstand high temperatures up to several hundred degrees Celsius.





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Answer 2

I only know about 3 one :

Evaporating dishes are used to evaporate excess solvents – most commonly water – to produce a concentrated solution or a solid precipitate of the dissolved substance. Most are made of porcelain or borosilicate glass.