D. mixture in which its components retain their identity
In a heterogeneous mixture, multiple substances are mixed, but they don't chemically react and they remain chemically the same.
The sand on the beach cools down at night then the ocean is because the sand is on dry land.
Answer:

Explanation:
Hello,
In this case, the undergoing balanced chemical reaction is:

Thus, as 5.22 grams of aluminium oxide reacts, the required yielded amount of aluminium sulfate results:

Moreover, the percent yield is:

Best regards.
D
Boiling and melting are both physical changes so do not involve the formation or breakage of chemical bonds.
Answer:
The given reaction is type of burning of methane.
Explanation:
Chemical equation:
CH₄ + O₂ → CO₂ + H₂O
Balanced chemical equation:
CH₄ + 2O₂ → CO₂ + 2H₂O
The given reaction is the burning of methane. When oxygen react with methane it produces carbon dioxide and water.
There are equal number of atoms of carbon, oxygen and hydrogen on both side of equation thus this reaction completely follow the law of conservation of mass.
According to the law of conservation mass, mass can neither be created nor destroyed in a chemical equation.
This law was given by french chemist Antoine Lavoisier in 1789. According to this law mass of reactant and mass of product must be equal, because masses are not created or destroyed in a chemical reaction.