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

2.8 Chemical formulae — Visual & Photo Quiz

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  • Questions count: 2
  • Passing grade: B+
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1.
Look at the space-filling molecular model of water (H₂O). What does the subscript '2' in the chemical formula tell you?
Dr Dabour Hub Academy - figure 1
There are 2 hydrogen atoms bonded to every 1 oxygen atom in a water molecule
There are 2 oxygen atoms for every 1 hydrogen atom
Water can only exist in 2 states of matter
The molecule has a molecular mass of 2 grams
2.
Look at the molecular model of carbon dioxide (CO₂). How many total atoms are present in a single molecule of carbon dioxide?
Dr Dabour Hub Academy - figure 2
3 atoms (1 carbon atom and 2 oxygen atoms)
2 atoms (1 carbon and 1 oxygen)
4 atoms (2 carbons and 2 oxygens)
6 atoms
  • 1
  • 2
Part of Chapter 2: Elements, Compounds and Mixtures — see every lesson and quiz in this unit.
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