Question

Short answer questions
D. Answer in brief.
1.What is an element?
2. Define an atom and a molecule.
(3.) What is the formula of nitric acid? Name the
atoms present in one molecule of nitric acid,
4.compoundA reacts with another compound B to form a compound c . what kind of change does this represent
5. What compounds do these formulae
represent? H,O, CO,, CuSO4, NaHCO,.
6. What is crystallisation? What is it used for?
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Answer 1

Explanation:

एनिमल्स नेम्स ऑफ मॉलिक्यूल एंड एग्जाम इन हाउस ऑफ स्टोंस मॉलिक्यूल एंड एलिमेंट्स आल्सो राइट हाउ ऑक्सीजन इंसाइड एंड गिव सम ऐक्स ऐन ऐक्स ऐन ऐक्स

Answer 2

an element is a simple and pure form of matter which cannot be decomposed into simpler substances.

an atom is the smallest particle of an element which may or may not exist independently but can take part in a chemical reaction.

a molecule is the smallest particle that has the capability to exist independently.