MEDIUM
Upper Secondary: IGCSE
IMPORTANT
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A compound melts at 20 °C. Will it conduct electricity at 25 °C? Give a reason.

Important Questions on Atoms Combining

HARD
Upper Secondary: IGCSE
IMPORTANT
Complete Chemistry for Cambridge IGCSE® Second Edition>Chapter 4 - Atoms Combining>Q>Q 5
Describe the arrangement of particles in ice. How will the arrangement change as the ice warms up?
HARD
Upper Secondary: IGCSE
IMPORTANT
Complete Chemistry for Cambridge IGCSE® Second Edition>Chapter 4 - Atoms Combining>Q>Q 1
The covalent compound ethanol melts at -114 °C. Is it a molecular compound, or a giant structure? Explain.
EASY
Upper Secondary: IGCSE
IMPORTANT
Complete Chemistry for Cambridge IGCSE® Second Edition>Chapter 4 - Atoms Combining>Q>Q 2
Diamond and graphite are allotropes of carbon. What does that mean?
MEDIUM
Upper Secondary: IGCSE
IMPORTANT
Complete Chemistry for Cambridge IGCSE® Second Edition>Chapter 4 - Atoms Combining>Q>Q 3
Why is diamond so hard?
HARD
Upper Secondary: IGCSE
IMPORTANT
Complete Chemistry for Cambridge IGCSE® Second Edition>Chapter 4 - Atoms Combining>Q>Q 4
Why diamond and graphite have such very different properties? Draw diagrams to explain.
MEDIUM
Upper Secondary: IGCSE
IMPORTANT
Complete Chemistry for Cambridge IGCSE® Second Edition>Chapter 4 - Atoms Combining>Q>Q 5
Explain why silica has high melting point.
HARD
Upper Secondary: IGCSE
IMPORTANT
Complete Chemistry for Cambridge IGCSE® Second Edition>Chapter 4 - Atoms Combining>Q>Q 5
Suggest a reason why the melting point of silica is lower than that of diamond.
MEDIUM
Upper Secondary: IGCSE
IMPORTANT
Complete Chemistry for Cambridge IGCSE® Second Edition>Chapter 4 - Atoms Combining>Exercise 12>Q ▲

Question Image 

What uses of metals can you see in this picture?