A) heating a pot of water on a stove
Salt, sugar, baking soda, etc. Some also consider honey, tap water, and vegetable oil as pure substances.
2 is the number as you need to balance the equation
Plagiarism is when you just copy exactly what someone else says, without their permission, or without citing where you got it from.
Common knowledge should be your own words. unless you take it from somewhere else, it doesnt need anything.
