This is seen in the first law of Thermodynamics stating that matter and energy cannot be destroyed nor created.
2 H₂ + O₂ = 2 H₂O
Answer B only synthesis.
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Compound can be described using element symbol and numbers . it is a mixture which is result of two or more chemical element in such a way that atoms of different elements held together by chemical compound that are difficult to break . Most often a compound looks and behave like an element
for example :- Hydrogen and oxygen .. both of these elements are gaseous at room temperature and atmospheric pressure , but when both combined they both form compound water . ( H2O )
The answer is D they have 4 neutrons
