Year 8 holiday work

Year 8 - You sat some important exams, this term. These papers may have identified a few weaknesses and rusty areas. If you need to brush up on any topics do use the resources here: http://bramblesci.blogspot.co.uk/p/science-at-brambletye.html
on the Science blog page to help.
Make sure you have a good rest, give lots of lovely presents and are helpful around the house.
IRP

Year 7 are on fire!

One Year 7 Science class have finished their work for the term and spent our last lesson looking at hydrocarbons. We first revisited the conditions required for combustion and then looked into hydrocarbons. Our first experiment involved testing our prediction that water and carbon dioxide would be produced when a hydrocarbon combusts. 

Then we did one of our favourite experiments - the methane mamba! We are able to capture the methane in bubbles which we can set alight in the palm of our hands.

They represented all they had learnt in the form of a poster.

Last expt of term

Year 7 calculated the density of oxygen in the lab today.

Snack time

Year 8 are doing am experiement to see how much energy they can collect from certain snack foods like crisps, wotsits and pringles

 The amount of water was measured

 its temperature before and after were noted

Carful measuring gives accuracy 

 The burning food gives the water energy

The snack needs to be weighed 

 The burning snack raises the temperature of the water

so the temperature needs to be taken before and after the experiment 

 Reading the scale very carefully

and resetting the equipment in between 

Setting it all very carefully 

Then choose a new snack food 

 and repeat the process

 until all of them have been done

Which snack food contains the most energy 

 trying to catch all of the heat

and resetting the equipment each time

 The snack with the most energy is ...................

6S decompose!

Today 6S investigated the thermal decomposition of zinc carbonate

 Zinc carbonate splits up when heated

 and gives off a gas

 this gas is carbondioxide

it can be tested for using limewater 

 which turns from clear to milky.

The mass before and after was taken  

 so that a graph can be plotted.

Year 7 Concentrate

Year 7 were set the task of working out which of two acids was the most concentrated



They measured the acid carefully

then added universal indicator

 then they used a burette to add alkali

and kept adding it a bit at a time

until it turned neutral

which shows green with universal indicator

 whihc ever acid uses most alkali is the most concentrated

accurate work is important

7C concentrate

7C learned the difference between strength and concentration today.

They had to find which acid was more concentrated 



 So they took 10ml of the acid and added universal indicator

 They then used an alkali to neutralise it

The alkali was sodium hydroxide

 They added alkali until the solution in the conical flask turned green
and then saw which acid used the most alkali.

That one was the most concentrated.

Hydrochloric acid + sodium hydroxide => sodium chloride + water

Preprep Science club are on fire

The Preprep Science club came to the lab today to learn all about fire.

We saw how oxygen from the air was needed.

The candle in a jar over water experiment proves that.  

Then we saw the gas taps and lit the Bunsen burner

Not so exciting perhaps 

but then we saw how you can put soapy bubbles full of methane  on our hands

and then you can set it alight as long as your arm is stretched out and the bubbles are on top

Brave scientists had a go themselves 

 Always remembering that fire is dangerous

small bits first 

 But Mr Purcell has done it before so he showed you could use a lot of bubbles if you were careful

It just feels a bit warm 

but can be a bit of a shock 

but does not hurt you 

as long as you do as you are told 

and wear the proper safety equipment 

its all safe 

 and rather exciting

completing the fire triangle

and seeing big flames 

appearing to come out of your hand 

magic or science 

science or magic