Science Experiments

On The Surface1. Four options were tested.2. A paper towel is made from wood pulp.3. A cotton reel can be reused 70-130 times.4. Hot-air dryers dry your hands by evaporating the water with heated air.5. Cold-air blade dryers were considered greener.
Discovering Techniques1. a. An example of alliteration is "pulp and paper process".    b. An example of a comparative adjective is "by far the greenest".    c. An example of a superlative adjective is "2. Three different fill colours are used in this table, because one is for the advantages, one is for the disadvantages, and one is neutral.3. The sources of information are given in the fine print on the bottom left.
Search And Think1. This article uses photos instead of illustrations, because it is sharing information about certain objects.2. Another visual text this article uses is the bold and colourful title, which draws readers in.3. Paper towels have one good point: they are made from recycled materials.4. The cool-air blade dryer is greener than the hot-air dryer, as it doesn't let out as much carbon dioxide.
Hidden Depths1. If using paper towels you should pick ones with a FSC, PEFC, or ECNZ certification, because these are all corporations that support sustainable foresting and environment friendly products.2. I would prefer to use the cool-air blade dryer, as it drys quickly and is good for the environment, and I would least prefer to use cotton reels, as other peoples hands have been dried on them, and they get wet quickly.

Acids and Bases



Green and Rainbow challengesA: Green challenge:
Take a test tube and fill with "two fingers" of the base. Now see the teacher for three drops of universal indicator. Now add the acid
Observations:1. When we added the universal indicator to the base the colour changed to ___Blue____.2. When the solution was neutralised the colour changed to _____Red or Green_____
The most difficult thing about this challenge was (Complete this)was trying to get a "rainbow" colorInclude a photo of the final green solution.
B: Rainbow challenge:
Take a test tube, the base and the acid and universal indicator and create a the best rainbow in a test tube you can manage.
Put a photo of your rainbow in a test tube here: 









For the experiment chemicals this is what happen when we used different colored paper, and acid, sodium deoxide. first we halfed the papers into 3 peices and put them in 3 by 4 tray and put 2 drops of liquid chemicals. And it changes colors





Year 10Practical Assessment – Chemistry – Acids and BasesAim:To measure the pH of several solids and liquids using universal indicator solution and a pH penEquipment:Spotting tileUniversal indicator solutionSamples of several solids and liquidspH penMethod:1.       Take two samples of each solid/liquid to be tested and arrange on your spotting tile. (If you are testing a solid add a drop of water and mix it before adding indicator)2.       Place one drop of universal indicator on ONE of each sample.3.       Use the pH pen to measure the pH of the other sample of each substanceResults:

Substance	Colour with pH	Description	pH Meter reading	Description
Eg. Substance A	Pale blue	Weak base	8.3	Weak base
Sugar	Blue	Weak	6.3
Lux flakes	Blue	Weak	9.0
Detergent	Green	Neutral	69
Toothpaste	Blue	Weak	57
Fruit juice	Pale Red	Neutral / Acid	1.8
Window cleaner	Blue	Weak	6.6
Citric acid	Red	Acid	90
Cheesels	Orange	Acid / Weak	12

Chemical Reactions Experiments
1. Magnesium reacting with oxygen...
Method:Hold the strip of magnesium metal in the hottest part of the Bunsen burner flame until it catch fire.Do not look directly at the reaction because it will shine very brightly, and you could damage your eyes.
Observations:

The magnesium metal was
small, silver, and shiny.

The magnesium burned
with a bright, white glow.

After it burned, the magnesium
turned to a white powdery consistency.

The word equation is: Magnesium + Oxygen ---> Magnesium Oxide.The balanced chemical equation is: Mg2- + O2-  --->  MgO.