Chemistry

Intro - This week we are focusing on diffusion and particle theory.
Aim - Investigate if particles diffuse faster in hot or cold water.
Hypothesis- I think they will diffuse faster In hot water because on the video it says they move fast when the particles are heated whereas they slow down when cooled.
Results- My hypothesis was right, the hot water made it spread faster.
Discussion- It happened because the heat makes particles move faster than the cold.

Evaporation

We have been learning  about evaporation, what evaporation means is when a liquid of some sort by which water changes from a liquid to a gas or vapour. Evaporation is the primary pathway water moves from the liquid state back into the water cycle as atmospheric water vapour.

Aim: Evaporate copper sulfate ( blue liquid) = Solution.

Hypothesis: Gas formed, something will be left behind, 

Equipment: Copper sulfate solution, 250mL Beaker, heat proof mat, evaporating basin, element. 

Method: 

1. Set up element

2. Add 100mL of hot water to the beaker and place on the element.

3. Add copper sulfate to the evaporating basin until it is quarter full.

4. Carefully, place the the evaporating basin on top of the beaker. 

5. Turn on the element to 4.

6. Heat the solution until most of the solvent has been evaporated and crystals of solute are forming. 

7. Turn off the element- careful not to touch as will be hot for a long time.

Oberservations: It slowly started to heat up, there was steam, started to make a powder.

Conclusion: Yes.

Discussion: What happened and why… using your scientific keywords (Evaporating, Solvent, solute, solution, mixture, heat, boil)

Evaluation: This was fun but next time I would only have one thing on the element at a time to make sure it boiled.

Dilution expierament.

Intro: we were learning about dilution, we had to dilute potassium permanganate with water.

Aim: To dilute potassium permanganate to see how dilution works.

Method: we had to put 10 mls of water in the first test tube then a little bit of potassium permanganate.

Then we had to take 5 mils of that and add it to the 5 mls of water in the next test tube then do the same until it got to the end and it was barely coloured anymore.

Equipment: 

1.potassium permanganate.

2. water.

3. test tubes and racks.

4. Pipette.

Results:

Discussion: They slowly got lighter and more dilute, you could clearly see the colour change. 

Filtration Experiment

We are doing an experiment to separate two chemicals from a mixture that we make.

Aim: To separate a solution from a precipitate ( Precipitate is the name for a solid that forms into a liquid during a chemical reaction.

Hypothesis: I think that the small particles will pass through the filter and the larger particles won't.

Method: 

1. Pour approximately 50 ml of copper sulphate solution into a beaker.

2. Add the same volume of sodium carbonate solution. A reaction will happen, you should see a cloudy blue precipitate form. Called copper carbonate. 

3. Watch demo then fold filter paper to fit inside the funnel

4. Place the funnel with the filter paper inside of it, into the mouth of a conical flask. 

5. Stir the mixture in the beaker, then carefully pour it into the funnel. 

6. Observe what happened.

Equipment:
Copper sulphate
Conical flask
Stiring rod
200ml beaker
Funnel
Filter paper

Observations:
when the two chemicals mixed it turned blue and bubbled
then when ot went through the filter paper it was completely clear.