Chemical Reactions. 8 th Science. Vocabulary. molecule – combination of 2 or more atoms bonded together compounds – substance made of 2 or more elements chemically combined synthesis – 2 or more substances combined to make a more complex substance
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Once energy available atoms begin forming new bonds
Minimum amt. needed is activation energy
If exothermic -additional energy not needed to keep going as energy is being given off
If endothermic -need constant supply of energy to keep going as energy is being absorbed
Reaction in which 2 or more substances combine to form a single product, reactants may be elements or compounds, but product is always a single compound
Example – sulfur trioxide and water to form sulfuric acid
Decomposition Reaction single product, reactants may be elements or compounds, but product is always a single compound
Single Replacement single product, reactants may be elements or compounds, but product is always a single compound
Zn + 2HCl ZnCl2 + H2
Double - Replacement single product, reactants may be elements or compounds, but product is always a single compound
AgNO3 + NaCl AgCl + NaNO3
Combustion Reactions single product, reactants may be elements or compounds, but product is always a single compound
Question: How can you identify a chemical reaction?
Materials: well plate HCl magnesium silver nitrate baking soda sodium hydroxide copperII sulfate mossy zinc distilled water pipettes paper towels laminated template goggles aprons
Safety: Goggles must be worn at all times. Do NOT eat or drink anything during this lab. Wash your hands well before leaving class.
Procedure:1. Notice the laminated reaction template taped to your lab table. This is where you will complete all chemical reactions.
2. Using the prepared and labeled pipet, add 2- 4 drops of HCl in the boxes identified on the template. Return the pipet to the holder. Make observations in Data Table 1.
3.Place another 2-4 drops of HCl on the X in each box indicated where HCl is a reactant.
4. Repeat with 2-4 drops of copperII sulfate (CuSO4) in the box indicated on the template.
5. For each row that has a second reactant, add that reactant to the second column. Write your observations in Data Table 1.
6. Beginning with the first reaction, add the two reactants to the column marked “product” and observe what happens. Do only one reaction at a time, so you do not miss seeing any reaction that takes place. Record your observations in Data Table 1.
7. Continue combining reactants as indicated in the product column and write your observations for each set of chemicals.
8. When you have completed all combinations wipe the laminated template with a dry paper towel and through the paper towel in the trash can.
9. After you have cleaned the template and straightened the table be sure to wash your hands.
Vocabulary cont. single product, reactants may be elements or compounds, but product is always a single compound