Lesson 3: Ionic compounds Flashcards

1
Q

How do you write an ionic compound when given the ions?

A
  • You have to make sure the charge cancels out to 0 by increasing atoms.
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2
Q

What is the chemical formula for Magnesium Hydroxide:
Mg²⁺ OH⁻

A
  • You have 2 positives
  • You need 2 negatives
    So you write: Mg(OH)₂
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3
Q

What is the chemical formula for Aluminium carbonate:
Al³⁺ + CO₃²⁻

A
  • You need 6p’s and 6n’s
  • So, you write: Al₂(CO₃)₃
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4
Q

What is the difference between: (CO₃)₃ and CO₉?

A
  • (CO₃)₃ means three lots of CO₃. 3 carb, 9 oxygen
  • Whereas, CO₉ is a different compound. 1 carb, 9 oxygen
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