Question

pure substances and mixtures (worksheet)
q.1. use the words in the box below to label pure substances and mixtures.

• compound • heterogeneous
• homogeneous • element

q.2. fill in the blanks with suitable words.
a) ______________ is a pure substance containing only one type of atoms.
b) ______________ is a pure substance containing two or more elements chemically bonded together.
c) ______________ is a mixture in which the composition is not uniform throughout the mixture.
d) ______________ is a mixture in which the composition is uniform throughout the mixture.

Explanation:

• For Q1: Pure substances are either elements (simplest form with only one type of atom) or compounds (elements chemically bonded). Mixtures can be homogeneous (uniform composition) or heterogeneous (non - uniform composition).
• For Q2:
• a) An element is a pure substance with only one type of atom.
• b) A compound is a pure substance with two or more elements chemically bonded.
• c) A heterogeneous mixture has a non - uniform composition.
• d) A homogeneous mixture has a uniform composition.

Answer:

Q1:

• Pure Substances: Element, Compound
• Mixtures: Homogeneous, Heterogeneous

Q2:
a) Element
b) Compound
c) Heterogeneous mixture
d) Homogeneous mixture