Reminder
for the sake of pea brains
Events,
•
Battlefield Trip; 19th May
•
GetClassTee; 25th May
•
Sports Fest; 27th May
•June Holidays; 28th May~27th June
Updated on: 28th May 2010
In class
the trouble makers
We Are,
Girls
1.Adelyn• 2.Azirah• 3.Bibiana• 4.KhaiLing• 5.Camellia• 6.JunXian• 7.XinYu• 8.Elaine• 9.ShuQi• 10.Jannie• 11.Kimberly• 12.Hweezhi• 13.JiaLing• 14.Sammi• 15.Nicole• 16.Aliah• 17.Fithriyanni• 18.Ain• 19.Khalidah• 20.Aisyah• 21.Hazel• 22.Tiffany• 23.JiaYu•
Guys
24.Ahmad• 25.Bhagatjit• 26.Edwin• 27.ShaoMing• 28.Aaron• 29.Lewis• 30.WenJie• 31.Fikri• 32.Basir• 33.Bazil• 34.Fadzlan• 35.Nicholas• 36.Richie• 37.Kenneth• 38.WeiShin• 39.JiaFu• 40.ZiWei• 41.YungKit•
Teachers
our guidance
Teachers,
•English // Mdm Loh
•Maths // Mr Chen
•Science // Mrs Yeoh
•History // Mrs Ng
•Geography // Ms Suba
•Home Econs// Ms Lee & Mrs Kaur
•DnT // Ms Rabia&Mr Liew
•Art // Ms Shirley
•Lit. // Mrs George
•Music // Mr Leong
•PE // Mr Lok
blast
miscellaneous
You Are My Friend And I Hope.
You Know That's True.
No Matter What Happens
I Will Stand Right By You.
In Times Of Grief.
I Will Give You Belief.
I'll Be There For You.
Whenever You Are In Need.
To Lend You A Hand.
To Do A Good Deed.
So Just Call On Me When.
You Need Me, My Friend!
I Will Always Be There For You.
Right To The End!
Best Friends Forever!"
Science; Acids and Alkali
(PROPERTIES OF ACIDS )
Corrosive ('burns' your skin)
Sour taste (e.g. lemons, vinegar)
Contains hydrogen ions (H+) when dissolved in water
Has a pH less than 7
Turns blue litmus paper to a red colour
Reacts with bases to form salt and water
Reacts with metals to form hydrogen gas
Reacts with carbonates to form carbon dioxide, water and a salt \
Hydrochloric Acid: Also known as Muriatic Acid,
this is a highly corrosive acid and is often used to clean calcium carbonate
build up from the inside of kettles or from around water faucets and from
shower heads;
Sulphuric Acid: This is a common acid in both the laboratory and industry. I
t is both highly corrosive and economical to manufacture, which makes it the
reagent of choice for many applications;
Nitric Acid: This is another common laboratory acid used as a
reagent in many chemical tests and experiments due to the fact that
almost all of its products (salts) are soluble in water;
EXAMPLES OF ACIDS
Hydrochloric acid (HCl) in gastric juice
Sulphuric acid (H2SO4)
Nitric acid (HNO3)
Carbonic acid in softdrink (H2CO3)
Ascorbic acid (Vitamin C) in fruit
Citric acid in oranges and lemons
(PROPERTIES OF BASES AND ALKALIS )
Corrosive ('burns' your skin)
Soapy feel
Has a pH more than 7
Turns red litmus paper to a blue colour
Many alkalis (soluble bases) contain hydroxyl ions (OH-)
Reacts with acids to form salt and water
EXAMPLES OF BASES AND ALKALIS
Sodium hydroxide (NaOH) or caustic soda
Calcium hydroxide ( Ca(OH)2 ) or limewater
Ammonium hydroxide (NH4OH) or ammonia water
Magnesium hydroxide ( Mg(OH)2 ) or milk of magnesia
Many bleaches, soaps, toothpastes and cleaning agents
(INDICATORS )
An indicator, when added to an acid, a neutral substance or a base, will change different colours.
INDICATOR COLOUR IN ACID COLOUR IN NEUTRAL SOLUTION COLOUR IN BASE
Litmus red purple blue
Bromothymol Blue yellow blue blue
Phenolphthalein clear clear purple
Universal Indicator red Yellow-green purple
(REACTIONS WITH ACIDS )
ACID + BASE SALT + WATER
Hydrochloric Acid + Sodium Hydroxide Sodium Chloride + Water
HCl + NaOH NaCl + H2O
ACID + METAL SALT + HYDROGEN GAS
Hydrochloric Acid + Magnesium Magnesium Chloride + Hydrogen
HCl + Mg MgCl2 + H2
ACID + CARBONATE SALT + WATER + CARBON DIOXIDE GAS
Hydrochloric Acid + Calcium Carbonate Calcium Chloride + Water + Carbon Dioxide
HCl + CaCO3 CaCl2 + H2O + CO2
; Hope it Helps?
Posting for the fun of it ^^
A BLOCK OF CHEESE:)
Labels: Science