It depends. If you want to then you can, but your teacher has to approve first. Also your sentences, paragraphs, and basically the whole thing have to make sense if you put in lots of scientific words.
Its how the British write colors. They write lots of words like that.
To save writing out very large numbers or very small numbers that have lots and lots of noughts.
Yes, she has sang lots of holiday songs.
because you get lots of presents because you get lots of presents
Some electronic values are very large or very small, so it is more convenient to use scientific notation than to write out lots of zeros.
Halloween is a great holiday and many people have it as their favorite holiday.
There is no such law. "Scientific notation" is a convention (not a law), that lets you write very large or very small numbers in a brief way (without writing lots of zeros). You can find details, and examples, in the Wikipedia article on "Scientific notation".
writing about your views or even anything you like or enjoy doing, you can write about your friends , music , anythng!
The only limit is the size of the space. You can write very small & use lots of words.
Canada's national holiday would be Canada Day and lots of people celibrate it, it's not a religious holiday.
The holiday mode is if you have made lots of food for the holiday and it makes the food to the right coolness for reheating.
Lots of inventions use the scientific method.