Synthesis Reactions by tmV8HuPA

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									High School Science                                                Reactants and Products
Chemistry                                                               Student Resource
Name:

                               Synthesis Reactions
What happens when chemicals are mixed? Sometimes they combine. Here are some examples.

A Demonstration: Watch the demonstration by the teacher and then describe it in your own
words.




March 16, 2005                                               SCoPE SC100403 Page 1 of 3
High School Science                                                    Reactants and Products
Chemistry                                                                   Student Resource
                         Reactants
                     Formula of Reactants
                 Picture of Model of Reactants



                           Products

                 Picture of Model of Products



                                      Balanced Equation




1. What were the reactants?
2. What was (were) the product(s)?
3. What was left over?


Watch another demonstration. Do not look directly at the burning magnesium.
4. What was the product when magnesium was burned?
5. Is this the same as the ribbon we burned (the reactant)?




March 16, 2005                                                  SCoPE SC100403 Page 2 of 3
High School Science                                                       Reactants and Products
Chemistry                                                                      Student Resource


Constructing Knowledge
Examine the balanced chemical equations for two common chemical reactions below.

      You have aluminum lawn furniture. It has been sitting outside for a long
       time. You notice that a whitish powdery coating has formed on the arms.
       4Al (s) + 3O2 (g)  2Al2O3 (s)



      Calcium oxide (CaO) is called “quicklime.” When it comes in contact with
       water, a strong reaction occurs that releases heat. The product is more than twice the
       volume of the reactants. It is called calcium hydroxide. CaO (s) + H2O (l)  Ca (OH)2
       (aq)

6. Do you notice any patterns in all these reactions?




Going Further
Have you ever generated hydrogen gas? You might have put a tiny bit of zinc metal into an acid,
and watched the bubbles rise from the test tube. To check that this is really hydrogen gas, a
chemist places a glowing splint in the gas (not in the liquid). There is a sharp “pop” when you do
this. Think of the reaction between the hydrogen and the air (not what happened in the acid).

7. How is the “pop” of hydrogen in oxygen like other reactions in this lesson?




8. We call all these reactions synthesis. Can you think of any other synthesis reactions?




March 16, 2005                                                     SCoPE SC100403 Page 3 of 3

								
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