Curriculum
Course: Alhussan Chemistry — Stage 7
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Curriculum

Alhussan Chemistry — Stage 7

Chapter 1: The Particle Model and States of Matter

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Chapter 2: Elements, Compounds and Mixtures

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Chapter 3: Metals and Non-Metals

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Chapter 4: Chemical Reactions 1

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Chapter 5: Acids and Alkalis

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Chapter 6: The Earth and Plate Tectonics

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Quiz

1.4 Changes of state — Visual & Photo Quiz

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  • Questions count: 4
  • Passing grade: B+
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1.
Look at the photograph of the burning candle. What sequential changes of state take place in the candle wax?
Dr Dabour Hub Academy - figure 1
Solid wax melts to liquid wax, which then evaporates into wax gas that burns
Solid wax sublimates directly to flame without melting
Liquid wax freezes into gas bubbles that produce heat
The wick burns while the wax remains unchanged as a solid
2.
Look at the photograph showing wet clothes drying outdoors. Why does water evaporate from clothes even on cool days below 100°C?
Dr Dabour Hub Academy - figure 2
Evaporation occurs at the liquid surface at any temperature when faster-moving particles escape
Clothes can only dry if the air temperature reaches the boiling point (100°C)
Water in clothes changes into solid crystals that fall to the ground
Wind destroys the water particles so they no longer exist
3.
Look at the photograph showing eggs boiling in a pot of water. What are the bubbles forming throughout the boiling water made of?
Dr Dabour Hub Academy - figure 3
Water vapor (steam) formed throughout the liquid when water reaches 100°C
Air trapped inside the egg shells escaping into the water
Hydrogen gas produced by the decomposition of water
Carbon dioxide gas released from the bottom of the pot
4.
Look at the visual diagram showing particles during evaporation. Which particles are able to escape from the liquid?
Dr Dabour Hub Academy - figure 4
The fastest-moving particles near the liquid surface that overcome attractive forces
The slowest particles that settle at the bottom of the container
All particles simultaneously at a single instant
Only particles that have broken down into single atoms
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Part of Chapter 1: The Particle Model and States of Matter — see every lesson and quiz in this unit.
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