Category Archives: chemistry 9

More about ions

   1.  All elements form ions during reactions. Agree or disagree? 2.  Elements of Groups I & II form __________ ions. 3.  Elements of Group VI & VII form ________ ions. 4.  Why are the elements of Group IV & … Continue reading

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The ionic bond

      1.  Give a diagrammatic representation of the reaction  Na + Cl  à  NaCl 2.  What is an ionic bond? 3.  In an ionic bond the force of attraction between the ions is ________ (weak/strong). 4.  Describe the … Continue reading

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Why do atoms form bonds?

  1.  Describe the reaction between sodium and chlorine in the lab. 2.  Why do atoms of most elements form bonds? 3.  Why is welding often carried out in an atmosphere of argon? 4.  Give a diagrammatic representation of the … Continue reading

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Compounds, Mixtures and Chemical change

  1.  A  ____________ contains only one kind of atom. 2.  How is a compound formed? 3. There are millions of compounds. True or False? 4.  Write the formulae for the following compounds: a. water          b. carbondioxide       c. ethanol 5.  … Continue reading

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Group O : the noble gases

  1.  Name the noble gases. 2.  Why are they called noble gases? 3.  Write the four physical properties of noble gases. 4.  Why are noble gases unreactive? 5.  Although Helium is the second most abundant gas in the universe, … Continue reading

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