Question

Fill in the blank spaces by choosing the correct words from the list given below:
List: atom, analysis, formula, molecule, ferrous sulphide, air, physical, energy, heterogeneous, compound, dissolved

When two or more elements react chemically a ……………… is formed.

Answer 1

• Compounds are formed when two or more elements combine chemically to generate a new material known as a compound.
• Chemical compounds are a frequent word for compounds.
• Compounds like water $\left({\mathrm{H}}_2\mathrm{O}\right)$ is formed by the chemical combination of hydrogen and oxygen at appropriate reaction conditions.
• $2{\mathrm{H}}_2\left(\mathrm{g}\right)+{\mathrm{O}}_2\left(\mathrm{g}\right)\to 2{\mathrm{H}}_2\mathrm{O}\left(\mathrm{l}\right)$

Conclusion: When two or more elements react chemically a compound is formed.