Explain the process of spontaneous combustion?
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when we covert any substance into vapour state from solid state, is it ionized or not?
When a glass rod is heated gradually and suddenly dipped in cold water, it cracks. What is the reason?? When a cool glass rod is suddenly heated, it cracks. Why?
What is Evaporation ?
How is the accuracy of the method determined?
Why is eriochrome black t indicator cannot be used in this experiment?
which metal is found abundantly in the earths crust??
What is Filtration ?
Acid value defination is numbber milligrams of KOH required to nuetralise the acid present in one gram oil & fats but why not use NaOH for nuetralisation?
What is Atomic number?
Why would we all suffocate, if all the green plants were killed ?
What is positive testing in relation to chemistry? For example, the sentence reads "Sample solutions are solutions known to contain one of each of the following ions, silver ion, Ag+(aq), barium ion, Ba2+(aq), and iron (III) ion, Fe3+(aq). Testing solutions are the solutions containing a polyatomic ion that can react with one of the metal ions to give a positive test." I am then asked to define what a "positive test" is. I am currently a student who is pretty new to chemistry, please try and make your answer as simply as possible. Thanks for the help.
Why a hot day in Calcutta causes more discomfort than are equally hot day in Delhi ?