Question

Write the formula of three compounds which you know and name the elements in them​

Answer 1

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Step-by-step explanation:

Compound definition:

A compound is a chemical substance formed by two or more chemically bonded elements.

Three compounds:

Water is a compound with the formula
`\sf H_2O`.

Two hydrogen atoms and one oxygen atom is present in one molecule of water.

Sodium chloride or table salt is a compound with the formula
`\sf NaCl`.

One sodium atom and one chlorine atom is present in one molecule of sodium chloride.

Ammonia is a compound with the formula
`\sf NH_3`.

In one molecule of ammonia, one nitrogen atom and three hydrogen atoms are present.

Answer 2

See below

Step-by-step explanation:

Three compounds are:

1)
`\mathrm {H_(2)SO{4}}` [Sulfuric acid]

The elements in this compound are hydrogen (H) , Sulfur (S) and Oxygen (O).

2)
`\mathrm {NaOH}` [Sodium hydroxide]

The elements in this compound are Sodium (Na) , Oxygen (O) and Hydrogen (H).

3)
`\mathrm {HCl}` [Hydrochloric acid]

The elements are Hydrogen (H) and Chlorine (Cl).