Milk. Everything else is a compound/alloy.
This problem may easily solved by applying the conservation of mass, which states that the total mass before and after a change is constant because mass can neither be created nor destroyed.
We know that water consists of only hydrogen and water, and that there are no other reactants except hydrogen and oxygen. Thus:
Mass of reactants = Mass of product
mass of hydrogen + mass of oxygen = mass of water
4 + mass of oxygen = 36
mass of oxygen = 32 grams
The atomic number is 8
Atomic number=number of proton or number of electrons
Quantitative data can be counted, measured, and expressed using numbers. Qualitative data is descriptive and conceptual.
