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Casharo Chemistry Form 4

Casharo Chemistry (Kimistari) Form 4 oo aad telefoonkaaga ku barato: The periodic table, Chemical reactions. Waxaa la socda tusaalooyin tallaabo-tallaabo ah, suʼaalo tababar iyo imtixaannadii hore ee qaranka, dhammaan internet laʼaan.

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Casharo Chemistry

Xalal tallaabo-tallaabo ah

Tusaalooyin app-ka laga soo qaaday:

Balance the equation: H₂ + O₂ → H₂O 6 marks

  1. Count the atoms on each side - 2 H and 2 O on the left
  2. Put a 2 in front of water: H₂ + O₂ → 2H₂O
  3. Hydrogen is now 4, so put a 2 in front of H₂

Jawaab: 2H₂ + O₂ → 2H₂O

What is the atomic number of carbon, and how is it found? 4 marks

  1. The atomic number is the number of protons in the nucleus
  2. Carbon has 6 protons
  3. In a neutral atom the electrons number 6 as well

Jawaab: Z = 6

Suʼaalo tababar

3 ka mid ah 6-ka suʼaalood ee tababarka Chemistry ee app-ka:

The chemical formula for water is?

  • H₂O₂
  • H₂O
  • HO
  • H₃O
  1. Two hydrogen atoms, one oxygen
  2. H₂O

The atomic number of carbon is?

  • 4
  • 6
  • 12
  • 8
  1. Number of protons = 6
  2. Z = 6

Balanced reaction: 2H₂ + O₂ → ?

  • H₂O
  • 2H₂O
  • H₂O₂
  • 2HO
  1. 4 H and 2 O on the left
  2. 2H₂O balances it

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