Lab 5B

Types of Chemical Reactions
There are examples of Synthesis, decomposition, single replacement, and double replacement in this lab and from the results, we can figure out the chemical reactions.

Purpose of this lab:
To observe a variety of chemical reactions, to interpret and explan observations with balanced chemical equation, and to classify each reactions as one of the four main types.

There are 7 reactions

1. copper reacts with oxygen gas

• shiny, hard copper turns into multicoloured
• 2Cu + O2 -> 2CuO    
• it's Synthesis

2. shiny, silver nail is put in a  blue CuSo4 solution

• nail under the colution becomes copper and it's white 
• Fe + CuSo4 -> FeSo4 + Cu
• Single Replacement

3. buring blue crystal - CuSO4 ˙ 5H2O

• whitish grey colour appears on the outside
• CuSO4 ˙ 5H2O -> CuSo4 + H2O
• Decomposition

4. add water into the product of reaction3

• crystal turns blue again
• CuSo4 + H2O -> CuSO4 ˙ 5H2O
• Synthesis

5. putting CaCl2 solution and Na2CO3 together

• white precipitate settled under a layer of clear liquid as they are added together
• CaCl2 + Na2Co3 -> 2NaCl + CaCO3
• Double replacement

6. put solid zinc into HCl solution

• bubbles forming when zinc in the solution
• Zn + HCl -> ZnCl + H2
• Single replacement

7. observe H2O2

• tiny bubbles traveling toward surface
• H2O2 -> O2 +H2
• Decomposition

What did i learn??

In this lab, I learnt the differences between each types of reactions and able to identify each.  I can write the chemical equation for each reaction and balance them correctly