Question

q.3. fill in the blanks using the following word bank.

• compound
• homogeneous
• heterogeneous
• element

q.4. which of the diagrams below represent a compound made of two elements?
a)
b)
c)
d)

Explanation:

Q.3 - Answer-Explanation Format

1. Pure substances are made of only one type of particle, split into elements (single type of atom) and compounds (multiple bonded atoms). The first circular diagram shows identical single atoms, so it is an element. The second circular diagram shows identical molecules of bonded different atoms, so it is a compound.
2. Mixtures have two or more types of particles, split into homogeneous (uniform composition) and heterogeneous (non-uniform composition). The third circular diagram has a non-uniform mix of different particles, so it is heterogeneous. The fourth circular diagram has a uniform mix of different particles, so it is homogeneous.

A compound made of two elements consists of identical molecules where each molecule has atoms of two different elements bonded together.

• a) Shows only single identical atoms (element)
• b) Shows a mixture of single atoms and molecules (not a pure compound)
• c) Shows identical molecules made of two different bonded atoms (matches the definition)
• d) Shows a mixture of two different diatomic elements (not a compound)

Answer:

Top blank (above first circle): element
Second top blank (above second circle): compound
Bottom left blank (above third circle): heterogeneous
Bottom right blank (above fourth circle): homogeneous

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Q.4 - Answer-Explanation Format