Planned Activities
I. Organization moment:
Greeting
2. Тапсырма «Модельдеу» Молекулалардың модельдерін құрастыруға арналған жиынтықтарды пайдаланып келесі қосылыстардың формулаларымен молекула модельдерін құрастырыңдар I. мыс пен оттегінің II. мырыш пен хлор III. калий мен иод IV. магний мен күкірт Жұмыс аяқталған соң топтағы бір оқушы тапсырманы орындағаны жөнінде есеп береді және сынып оқушыларымен бірге қателерді талдайды
3.Additional examples
NaCl sodium chloride
KI potassium iodide
RbBr à rubidium bromide
MgS à magnesium sulfide
Mg3N2 à magnesium nitride
Sodium fluoride à NaF
Strontium oxide à SrO
Beryllium chloride à BeCl2
Cesium sulfide à Ce2S
Potassium phophide à K3P
II. Introduction of new topic:
While there are many thousands of different chemical compounds there is a very definite system of nomenclature whereby we can name or write chemical formulas for most compounds. We divide the compounds into two main types – binary compounds and ternary compounds.
Name the compound CaO.
·Ca is the chemical symbol for calcium.
·O is the symbol for oxygen, whose root is “ox.” Add the “ide” ending to get oxide.
·Put the pieces together to get the name calcium oxide.
Name the compound Li3N.
·Li is the chemical symbol for lithium.
·N is the chemical symbol for nitrogen, whose root is “nitr.” Add the “ide” ending to get nitride.
·Put the pieces together to get the name lithium nitride.
Write the formula for potassium sulfide.
·The chemical symbol of potassium is K. K is in the 1st column of the periodic table, therefore, its oxidation state is +1.
· Sulfide is derived from sulfur, whose symbol is S. Its oxidation state is -2.
+1 -2
·So far we have… K S.
·The total positive charge must balance the total negative charge. Therefore, we need 2 K atoms to give a total positive charge of +2. This balances the -2 charge on the sulfur.
· Putting it all together we have K2S. Additional examples
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