Question

choose two facts about organic compounds.
□ organic compounds are often associated with life.
□ organic compounds contain the element carbon.
□ organic compounds cannot include metalloids.
□ organic compounds are rare on the earth.

1. choose the best answer using the table.

chemical compounds
compound | chemical formula | elements
sand | sio₂ | silicon and oxygen
sugar | c₁₂h₂₂o₁₁ | carbon, hydrogen, and oxygen
lime | cao | calcium and oxygen
salt | nacl | sodium and chlorine
hydrogen peroxide | h₂o₂ | hydrogen and oxygen
carbon dioxide | co₂ | carbon and oxygen

what is the chemical formula for the compound of lime?
∘ h₂o₂
∘ cao
∘ co₂
∘ sio₂

Explanation:

Part 1: Choose TWO facts about organic compounds

• Fact 1: Organic compounds are often associated with life. Organic compounds are the basis of life processes, like in biological molecules (carbohydrates, proteins, etc.).
• Fact 2: Organic compounds contain the element carbon. By definition, organic compounds are carbon - containing compounds (with some exceptions like CO₂, but in general, carbon is a key element).
• The statement "Organic compounds cannot include metalloids" is wrong. Some organic compounds can have metalloids (e.g., organosilicon compounds).
• The statement "Organic compounds are rare on the earth" is wrong. Organic compounds are abundant, especially in living organisms and fossil fuels.

We refer to the table of chemical compounds. In the table, the row for the compound "lime" has the chemical formula $\text{CaO}$.

Answer:

• $\square$ Organic compounds are often associated with life. (checked)
• $\square$ Organic compounds contain the element carbon. (checked)

Part 2: What is the chemical formula for the compound of lime?