Anything in red is the question

Explanation:

Question 19.

The three the chemical formulae in red, C₂H₂, HF, and H₂O₂, represent compounds because a compound is the chemical union of two or more atoms of different kind.

The chemical union is done either by ionic bonds or covalent bonds.

C, H, F, and O are all non-metal elements. Non-metals combine each other through covalent bonds, which is the bond in which electrons are shared to complete the valence shell. Ionic bonds are formed by the electrostatic atraction between ions of different charge and is typical of the bond between a metal and a non-metal.

Thus, all the bonds are covalent and the compounds are molecular compounds.

Question 20.

You can determine the chemical formula using the molar masses of both Copper(II) sulfate and water.

Call n the number of water molecules in the molecular formula:

The ratio of water to copper(II) sulfate is:

Therefore, the formula of the hydrate contains 5 molecules of water and it is CuSO₄.5H₂O.

the answer is option a.

it would be b. 6co2 + 6h2o --> c6h12o6 + 6o2