Science

This week we did an on experiment on distillation 

Aim: To separate a water from a coke in a solution using  distillation.

Equipment: A solution of saltwater,conical flask heatproof mat, a delivery tube and bung,bung burner,tripod,gauze mat,retort stand ,boss head and clamp, boiling tube.

Method: 1. Set up the equipment as shown in the diagram.

              2. Add approximately 50 ml of saltwater to your conical flask.

              3. Light your Bunsen burner. Open the air hole and gently push the Bunsen burner the tripod.

       

              4.Heat the solution until most of the solvent has been evaporated.Turn off your Bunsen burner.

Result: The result is vapor was being collected from the conical flask and transferred in to test tube and condenses back into a liquid.

1.  Heating one liquid till it evaporated

2. Evaporation / condensation 

3. crude oil is a mixture of a large number of compounds (mainly hydrocarbons). Thethick, gooey liquid is of little use to anyone in this form. At an oil refinery, the various hydrocarbons are separated into mixtures of compounds with similar boiling points. This is done by a process called fractional distillation.

 

Crystal

Introduction:In science yesterday we made sugar crystals from homemade syrup, we put sugar on the sticks to make a surface for the crystals grow. 

Aim: The aim is to make sugar crystal to grow from the Popsicle stick and to see what they taste like when they are finished and eat it.

   

 Method 

In a beaker ,heat at lest 250 g of sugar together with 50 ml of water.

1. Dissolve the sugar in the boiling water.
2. Allow the solution to cool a bit before pouring it into your jar. 
3. Pour the sugar mixture  into a jar. Place a wooden skewer into the jar or else hang a string into the middle of the jar, tied to a pencil or butter knife.
4. Place the container somewhere it won’t be disturbed.Cover the jar with a paper towel or coffee filter to allow evaporation.
5. It may take a few days for the crystals to start to grow  If you see crystals forming on the top of the jar, you can remove them and eat them. If you leave them, these crystals will compete with your stick or string for sugar and will reduce the size of your crystals.
6. Remove the crystals and enjoy them! If you want to store the crystals before eating them, keep them in an airtight container so humidity in the air won’t make the rock candy sticky

3. the mixture is separating by sugar forming on the string or the stick leaving the liquid in the jar. 

Discussion: Making crystal can septet a solid from a liquid  hawere a highly concentrated solution way needed (  satiated solution in order to grow ays  tong.

HEC1

Last week we make a scones and we in group.


Scones are the easiest British teatime treat. Feel free to customise yours with dried fruit or a pinch of spice to make this basic scones recipe your own.

Each serving provides 150 kcal, 3.5g protein, 20g carbohydrates (of which 3.5g sugars), 6g fat (of which 3.5g saturates), 1g fibre and 0.4g salt.

Ingredients

• 225g/8oz self raising flour
• pinch of salt
• 55g/2oz butter
• 25g/1oz caster sugar
• 150ml/5fl oz milk
• 1 free-range egg, beaten, to glaze (alternatively use a little milk)

1. Mix together the flour and salt and rub in the butter.
2. Stir in the sugar and then the milk to get a soft dough.
3. Turn on to a floured work surface and knead very lightly. Pat out to a round 2cm/¾in thick. Use a 5cm/2in cutter to stamp out rounds and place on a baking sheet. Lightly knead together the rest of the dough and stamp out more scones to use it all up.
4. Brush the tops of the scones with the beaten egg. Bake for 12-15 minutes until well risen and golden.
5. Cool on a wire rack and serve with butter and good jam and maybe some clotted cream.

Science

Yesterday we did a Experiment to science.

Aim:To make a dilution series to investigate concentration.

Equipment:a potassium permanganate crystal,six large test tubes,tweezers,a plastic tranfer pipette a test tube rank,10 ml measuring cylinder

Method:1. place the six test tubes in a test tubes rack.Label the rack with numbers 1- 6.
2. Using the measuring cylinder fill the test tubes 1 with 10 ml of water.Fill the remaining test tubes with 5 ml of water.
3.then use the tweezers add a single crystal of potassium permanent to test tube 1.
4. Gently shake the test tubes until th crystal has dissolved.
5.Using the transfer pipette,carefully remove exactly 5 ml from test tube 1 and pour in into test tubes 2.
6.Rinse the transfer pipette thoroughly to ensure that no purple solution remains.
7.gently shake test tube 2 and repeat the transfer process, transferring exactly 5 ml of solution from test tube 2 to test tube 3.