Tuesday, 5 December 2017

science lab experiments

The Pop Test

The pop test is used to conclude whether there is hydrogen (H2) present.
The pop sound is the sound of the hydrogen combusting with oxygen.
2Mg + 2HCl -> 2MgCl + H2
We mix together Magnesium and Hydrochloric acid to react, which forms Magnesium Chloride and Hydrogen gas.

2 test tubes
Hydrochloric acid  
Bunsen burner

  1. Put Mg in test tube
  2. HCl in test tube
  3. Put another test tube over top to capture H2 gas
  4. Light it on fire.

Observation: when we added the acid to the Mg, it started to bubble and it was giving off gas.
Once we trapped the gas we lit it on fire resulting in a high pitched pop. This indicated that the gas was hydrogen.

Tollens’ Test

Tollens reagent is used to distinguish if something is a sugar
Tollens will only react with a sugar and will create a silver mirror
C2H4O + 2Ag+ + 2OH- -> C2H4O2 + 2Ag + H2O

Test tube

1.  Add sugar to test tube
2. Add tollens to the test tube
3. Swirl it around

Observation When we added the reagent we expected to see silver mirror form on the inside of the test tube. Instead of it going silver shiny it was more a dull silver and wasn't very shiny.

Nickel Amine Complex
Adding ethylenediamine to nickel replaces two waters with one ethylenediamine.
We can do this three times to form tris ethylenediamine nickel II
We can do this using just NH2 instead to form [Ni(NH2)6]

[Ni(H2O)6] + NH2CH2CH2NH2 -> [Ni(H2O)4(en)] + 2H2O
[Ni(H2O)4(en)] + en -> [Ni(H2O)2(en)2] + 2H2O
[Ni(H2O)2(en)2] + en -> [Ni(en)3] + 2H2O

3 Test tubes
We need a b
We need the ethylenediamine
We also need the nickel.

Observation:  we started with a nickel water complex we started adding ethylenediamine to the complex as we added more en the colour started to change from teal to blue then to pink. This is because as we add more en, it replaces the water molecules on the complex. The picture below is the hexammine complex we also made with some of the other complex on top.

Tuesday, 20 September 2016

life cycle of a frog

a frog starts at a egg and turns into a tadpole then it grows back legs and turns into a frog 

Friday, 9 September 2016

wk 7 reflections

this week i learnt how to add fractions and divide fractions and i learnt about china

Tuesday, 6 September 2016

Me and my friend get interviewed about the water fountain we asked for at the skate park

On Saturday I was interviewed by Tania Gibson about the water fountain at the skate park that me and my friends asked for.

Friday, 1 July 2016

week 9 reflections

This week I expanded my knowledge on mesurment and calculating distance and calculating time i'm pleased with myself.

Sunday, 12 June 2016

week 6 reflections

This week I made a tie die shirt and I made 3D shapes. 

Friday, 3 June 2016

weekly revision

this week i learnt how to tell the area of a triangle and now i know all of my nine times tables