Science - Combined - 0653 CIE

Simple Molecules And Covalent Bonds

Bayani Gaba-gaba

The oxygen you breathe, the water you drink and the methane that heats your food are all held together not by transferring electrons but by sharing them. This sharing creates the covalent bond, the glue of most non-metal compounds and the basis of all living matter.

In this lesson you will learn how a covalent bond forms when atoms share a pair of electrons, how to show this with simple diagrams, and how shared pairs build up familiar molecules such as hydrogen, water, methane and carbon dioxide.

Manufura

  1. [Core] State that a covalent bond is formed when a pair of electrons is shared between two atoms leading to noble gas electronic configurations
  2. [Core] Describe the formation of covalent bonds in simple molecules, including H , Cl , 2 2 H O, CH , NH and HCl. Use dot-and- 2 4 3 cross diagrams to show the electronic configurations in these molecules
  3. [Core] Describe the properties of simple molecular compounds: (a) low melting points and boiling points (b) poor electrical conductivity
  4. [Supplement] Describe the formation of covalent bonds in simple molecules, including CH OH, C H , 3 2 4 O , CO and N . Use dot-and-cross diagrams 2 2 2 to show the electronic configurations in these molecules

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Takardar Darasi

Covalent bonding holds together the molecules of life and of countless everyday materials. Once you understand electron sharing, you can explain the structures of gases, liquids and plastics, and predict how non-metal atoms combine.

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Za ka gamu da haɗe-haɗen nau'ikan tambayoyi, ciki har da tambayoyin zaɓi da yawa, tambayoyin gajeren amsa, da tambayoyin rubutu. Kowace tambaya an ƙirƙira ta da kyau don auna fannoni daban-daban na iliminka da ƙwarewar tunani mai zurfi.

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  1. A covalent bond is formed when atoms: A. Transfer electrons B. Share a pair of electrons C. Lose protons D. Gain neutrons Answer: B
  2. Covalent bonds usually form between: A. Two metals B. A metal and a non-metal C. Two non-metals D. Two ions Answer: C
  3. How many covalent bonds does carbon form in methane, CH4? A. 1 B. 2 C. 3 D. 4 Answer: D
  4. Simple molecular substances have low melting points because: A. The covalent bonds are weak B. The forces between molecules are weak C. They contain ions D. They have free electrons Answer: B
  5. Carbon dioxide, CO2, contains: A. Two single bonds B. Two double bonds C. One single bond D. Ionic bonds Answer: B

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