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2. What does this symbol mean

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2. What does this symbol mean Powered By Docstoc
					1. What does this symbol mean?

                           corrosive




2. Sodium has this hazard symbol -
what precautions should you take
when using it?     Goggles, pick up
                   with tweezers, use a
                   safety screen
3. What does this mean?




     toxic
4. What element does this
represent? sodium


               Na
5. Which group is it in?    1


                            3
6. Which period is it in?
7. Which of these is the flame
 colour for sodium chloride?




            The yellow one
 8. What can you say about the
  spectrum for each element?




Each element has a different spectrum, it can be used to identify
the element.
9. How did they know that there was
an undiscovered element in the sun?


   I’ve never seen
   that yellow line
  before when I’ve    There must be
   been looking at     an element on
       spectra.          the sun we
                           haven’t
There were               discovered
lines that             yet. Let’s call
                      it helium after
hadn’t been
                         the Greek
seen                   name for the
before in                   sun.
other
spectra.
10. What is the name of the group
which this element belong to?
                          The Halogens (Group 7)



                     Cl
11. What does Cl2 tell you? 2 atoms in a
chlorine molecule.


 12. Why am I added to water at
 the swimming pool? To kill bacteria.
13. What do these alkali metals
have in common? Soft, silvery, one electron in outer
shell, react with water to make hydrogen and an alkaline solution, all
end in ium, metals ….

Li          14. Do they become more or
Na          less reactive as you go down
            the group? more
K
               15. Name the two
Rb             products:
Cs                Sodium + water  sodium
                  hydroxide + hydrogen
16. Inside an atom there are
neutrons. What else are there?
   Protons and electrons
17. What word do we use to
describe a charged particle like
Na+? ions
18. Element or compound?
Compound because the atoms aren’t all the same.
19. Atom, molecule or ion? It is a
molecule – a group of atoms joined together.




                             H2
20. Atom, molecule or ion? Ion
because it has a charge.




                           Cl-
21. If my electron configuration is
2,8,1; what group am I in? 1 because there
is one electron in the outer shell.


             22. What period am I in? Period
             3 because 3 shells are used.
23. Why does sodium chloride
have a high melting point? There is a strong
attraction between the + and – ions and a lot of energy is needed to pull
them apart.

                                  24. Why are salt
                                  crystals cubic? The
                                  ions are arranged in a regular way –
                                  in a lattice.

                                25. Why don’t salt
                                crystals conduct
                                electricity? The ions are
                                fixed in position and can’t move
                                around.
26. Why does melted salt or salt
  solution conduct electricity?




                      The ions can move
                      around and carry
                      current.
        27. What’s the formula?
•   Water
•   Sodium chloride
•   Hydrogen
•   Chlorine
•   Sodium hydroxide
    H2O, NaCl, H2, Cl2, NaOH
           28. Give any trends.

 Name             Hardness         Density         Melting point
                                   g/cm3           oC

 Lithium          Fairly hard      0.53            180
                  to cut
 Sodium           Easy to cut      0.97            98
 Potassium        Very easy to     0.86            64
                  cut


As you go down the group, the elements get softer, there is no
pattern in density, the melting point decreases.
         29. What do they mean?
•   H2O (l)
•   Na (s)
•   Cl2 (g)
•   NaCl (s)
•   NaCl (aq)
Water is a liquid, sodium is a solid, chlorine is a gas, sodium chloride
solid and sodium chloride solution.
30. What happens to a chlorine
     atom when it reacts?




           Cl   2.8.7


 The atom will gain an electron to get a full outer
 shell. It will become Cl-
31. What happens to a sodium
     atom when it reacts?
               Na   2.8.1




 The atom will lose an electron to get a full outer
 shell. It will become Na+
         32. Give the ion for:
•   Sodium         Na+ (Group1)
•   Magnesium      Mg2+ (Group 2)
•   Aluminium      Al3+ (Group 3)
•   Fluorine       F- (Group 7)
•   Oxygen         O2- (Group 6)
              33. Which are salts?
•   Sodium
•   Chlorine
•   Sodium chloride
•   Potassium bromide
•   Magnesium
•   iodine

    Salts are made when you react a metal with a non-metal.

				
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