science

10 may 2018

Making Salt

AIM- to produce sodium chloride salt by carring out neutralisation reaction.  

EQUIPMENT- 50 mL beakers,dilute HCI (hydrchloric acid),dilute NaOH (sodim hydrxiode),25 mL measuring cylinder,a glass stirring rod,spotting tile,universal indicator solution,tripod,gauze mat,bunsen burner,evapourating basin.

METHOD-

1. using the mesuring cylinder measure 10 mL of HCI and pour it into your 50 mL beaker

2. every 10-15 drops stop adding the NaHO and use the glasss stirring rod to transfer a drop of the solution to a spotting tile.Test its pH using universal indicator.

3. keep adding NaHO and testing the solution by repeating step 2.As you get closer to neutral you may need to tes the solution after every drop.

4. pour the neutral solution into an evapourating basin and evaporate the water out of the solution using the equipment set up shonwn above.

observation-

The vapour from the water turned the neutral solution to small particles of salt

May 24, 2018 

Testing for Hydrogen Gas
Metals and Acid 

AIM- to show the hydrogen gas is produced when metal reacts with acid 

EQUIPMENT- A test tube, Bunsen burner, wooden splint, a bottle o acid, a piece of metal, safety glasses.

METHOD-

1. light your bunsen burner 
2. add your sample of metal to your test tube. Add 2mL of acid 
3. carefully invert the boiling tube above the test tube containing the metal and acid.
4. hold the test tubes together  for a few minutes, allowing time for the invert boiling tube to fill with gas.
5. when you think the tube is full, your lab partner should light a wooden splint .
6. carefully,but quickly tilt the boiling tube full of gas upwards and insert the burning splint into the mouth of the test tube.

OBSERVATION-we poured acid in a test tube approximately 2mL  and magnesium metal.We lit the wooden splint and



MAY 25,2018

metals and oxygen

making a metal oxide

AIM- to make a metal oxide and observe the difference in properties of the product compared to the reactants.
EQUIPMENT-  a piece of magnesium, bunsen burner, safety glasses, metal scissors tongs.
light your bunsen burner
hold your piece magnesium in the scissors tongs. Ensure your holding onto the very tip of the magnesium
place the other end of the magnesium into the bunsen flame(at the top of the blue flame).
when the magnesium begins to burn, do not look directly at it, as the light emitted can permanently damage your eyes
OBSERVATIONS-
                              before                                           after
magnesium-          metallic luster                                 bright white light
iron -                     metallic luster                                 black
copper-                  bronze                                           dark purple/black

Metal carbonates and acid

AIM-to show that carbon dioxide gas is produced when a metal Carbonate reacts with acid

EQUIPMENT-two boiling tubes,delivery tube and bung,bBunse burner,test tube rack,wooden splint,a bottle of acid,small amount of metal Carbonate,test tube tongs, safety glasses.

METHOD-

1. Light your bunsen burner
2. Add pea sized amount of the metal Carbonate into one of the boiling tubes
3. Place this boiling tube into a test tube rack. Ensure you have the bung and the delivery tube ready
4. Add 5ml of acid to the boiling tube and quickly insert the bung and delivery  tube into the mouth of the boiling tube 
5. holding the boiling tube with your tongs, capture the gas produced as shown in the diagram

6. when 

Observation

It got extinguished,Co2 was present and the Lime water + calcium Hydroxide Solution turned from colour less to cloudy

MAY 31st 2018

HOW TO MAKE HOKEY POKEY

AIM-to make hokey pokey and eat it

you will need

50g of sugar

1 tsp of water

1 table spoon of golden syrup

1/2 tsp of bicarbonate of soda

METHOD

1. put of the ingredient except the bicarbonate of soda into a saucepan and place on low heat 
2. stir until all the sugar has dissolved.raise the heat slightly so that it bubbles, and stir occasionally until you cannot feel any sugar at the bottom of the pan 
3. take off the heat 
4. add the bicarbonate of soda and stir
5. watch what happens - it should all froth up with bubbles in the pan 
6. pour out into your tinfoil sheet 
7. allow to cool 

OBSERVATIONS -it froth up with bubbles in the pan. carbonate reacted with carbon dioxide we tracked that in the golden syrup

01 June 2018

corrosion

Investigating rusting

AIM- to investigate the factors that cause rusting iron

EQUIPMENT- six test tubes,test tube rack, a bung, four iron nails, boiled water, tap water, salty water,cooking oil , calcium chloride.

METHOD-

1. label four test tubes A-D and place in a test tube rack 
2. test tube contents: A= iron nail and tap water                                                                                                               B= iron nail and salty water                                                                                                             C=iron nail ,boiled water + oil                                                                                                         D=iron  nail and calcium chloride. sealed with a bung                                                                     E= Mg ribbon wrapped around it                                                                                                     F=nail polish 
3. leave the test tubes undisturbed for at least three days 

BEFORE  

OBSERVATION-

Test tube	Conditions present or absent	Observation
A	Tap water	Rusting
B	Salt water	Slightly rusty
C	Calcium chloride	No rust
D	Oil and water	No rust
E	Nail polish	No rust
F	Mg ribbon wrapped around	Slightly rusty

AFTER  

CONCLUSION- 
rusting of iron requires water and oxygen. when either of these are removed, no rusting occurs.salt speeds up the process of rusting.