Question

Classify the following substances as element mixture or compound.(1) limestone (2) diamond (3) sand (4) urine (5) air(6) neon(7) gold.

Answer 1

Answer:

Element: neon, gold

Mixture: diamond, sand, urine, air

Compound: Limestone

Explanation:

element: Pure substance having only atoms with the same number of protons in their nuclei.

Mixture: Mixture is made by combining two or more substances. But they are not combined chemically.

Compound: Compound is a chemical substance with many identical molecules having atoms from more than one element combined by a chemical bond.

From the given substances

Element: neon, gold

Mixture: diamond, sand, urine, air,

Compound: Limestone

Answer 2

Answer:

Limestone ⇒ Calcium Carbonate ⇒ CaCO3 (it is made up more than one element and is a compound)

Diamond ⇒ Allotrope of carbon ⇒ element

sand ⇒ mixture of elements like silicon

Urine ⇒ uric acid + urea + ammonia + water (mixture)

air ⇒ mixture of gasses

Neon ⇒ element (Ne)

Gold ⇒ Element (Au)