https://padlet.com/eidlan_roslee/h8gty7rs5nfu padlet project en-us 2019-06-16 13:23:52 UTC 2025-10-09 05:15:45 UTC hello@padlet.com eidlan_roslee https://padlet.com/eidlan_roslee/h8gty7rs5nfu/wish/367770996 Padlet project]]> 2019-06-16 13:28:36 UTC https://padlet.com/eidlan_roslee/h8gty7rs5nfu/wish/367770996 eidlan_roslee https://padlet.com/eidlan_roslee/h8gty7rs5nfu/wish/367771329 The word acid comes from the latin word, acidus which means sour.
The word alkali comes from the arabic word, alqali which means ashes of plants]]> 2019-06-16 13:35:07 UTC https://padlet.com/eidlan_roslee/h8gty7rs5nfu/wish/367771329 eidlan_roslee https://padlet.com/eidlan_roslee/h8gty7rs5nfu/wish/367773192 Vinegar, lemon juice, oranges ]]> 2019-06-16 14:04:18 UTC https://padlet.com/eidlan_roslee/h8gty7rs5nfu/wish/367773192 eidlan_roslee https://padlet.com/eidlan_roslee/h8gty7rs5nfu/wish/367773964 Soap, toothpaste, baking soda ]]> 2019-06-16 14:15:12 UTC https://padlet.com/eidlan_roslee/h8gty7rs5nfu/wish/367773964 eidlan_roslee https://padlet.com/eidlan_roslee/h8gty7rs5nfu/wish/367774324 An indicator is a coloring or mixture of different colorings that change colour based on the substance used]]> 2019-06-16 14:21:25 UTC https://padlet.com/eidlan_roslee/h8gty7rs5nfu/wish/367774324 eidlan_roslee https://padlet.com/eidlan_roslee/h8gty7rs5nfu/wish/367774639 Acid:colourless 
Neutral:colourless 
Alkali:pink]]> 2019-06-16 14:25:00 UTC https://padlet.com/eidlan_roslee/h8gty7rs5nfu/wish/367774639 eidlan_roslee https://padlet.com/eidlan_roslee/h8gty7rs5nfu/wish/367857970 Acid:red
Neutral:green 
Blue:blue]]> 2019-06-17 06:36:27 UTC https://padlet.com/eidlan_roslee/h8gty7rs5nfu/wish/367857970 eidlan_roslee https://padlet.com/eidlan_roslee/h8gty7rs5nfu/wish/367858527 Acid:red
Neutral:yellow 
Alkali:yellow]]> 2019-06-17 06:40:53 UTC https://padlet.com/eidlan_roslee/h8gty7rs5nfu/wish/367858527 eidlan_roslee https://padlet.com/eidlan_roslee/h8gty7rs5nfu/wish/367858911 Acid:red
Neutral:blue
Alkali:blue]]> 2019-06-17 06:43:14 UTC https://padlet.com/eidlan_roslee/h8gty7rs5nfu/wish/367858911 eidlan_roslee https://padlet.com/eidlan_roslee/h8gty7rs5nfu/wish/367859113 Acid:red
Neutral:red
Alkali:blue]]> 2019-06-17 06:44:49 UTC https://padlet.com/eidlan_roslee/h8gty7rs5nfu/wish/367859113 eidlan_roslee https://padlet.com/eidlan_roslee/h8gty7rs5nfu/wish/367859330 acids and alkalis will only show their properties in the presence of water ]]> 2019-06-17 06:46:48 UTC https://padlet.com/eidlan_roslee/h8gty7rs5nfu/wish/367859330 eidlan_roslee https://padlet.com/eidlan_roslee/h8gty7rs5nfu/wish/367860442 A pH scale is used to show the strength of acids or alkalis.
7 is the neutral level.
Any number below 7 is acidic. The lower the number, the more acidic the substance is.
Any number above 7 is alkalic. The higher the number, the stronger the alkali]]> 2019-06-17 06:55:32 UTC https://padlet.com/eidlan_roslee/h8gty7rs5nfu/wish/367860442 eidlan_roslee https://padlet.com/eidlan_roslee/h8gty7rs5nfu/wish/367861194 Acids and alkalis are always used in our daily lives. They are also used in sectors like agriculture and industry ]]> 2019-06-17 07:02:22 UTC https://padlet.com/eidlan_roslee/h8gty7rs5nfu/wish/367861194 eidlan_roslee https://padlet.com/eidlan_roslee/h8gty7rs5nfu/wish/367861700 Here are some instances of acids and alkalis used in our daily lives:

Acid: vinegar -> food flavouring/preservative

Alkali: detergent -> washing clothes ]]> 2019-06-17 07:06:37 UTC https://padlet.com/eidlan_roslee/h8gty7rs5nfu/wish/367861700 eidlan_roslee https://padlet.com/eidlan_roslee/h8gty7rs5nfu/wish/367862574 Acids and alkalis are also used in sectors like agriculture and industry.

Examples:
Farmers use slaked lime (alkali) to neutralise acidic soil for their crops.

Industries use acidic substances to dissolve certain things depending on what they produce ]]> 2019-06-17 07:13:48 UTC https://padlet.com/eidlan_roslee/h8gty7rs5nfu/wish/367862574 eidlan_roslee https://padlet.com/eidlan_roslee/h8gty7rs5nfu/wish/367863344 Neutralisation occurs when an acidic substance is mixed with an alkaline substance and vice versa.

The equation for neutralisation is:

Acid +Alkali= salt + water ]]> 2019-06-17 07:18:52 UTC https://padlet.com/eidlan_roslee/h8gty7rs5nfu/wish/367863344 eidlan_roslee https://padlet.com/eidlan_roslee/h8gty7rs5nfu/wish/367864556 Different acids and alkalis produce different salts. Examples:

Hydrochloric acid + sodium hydroxide (alkali) = sodium chloride
Sulphuric acid + potassium hydroxide (alkali) = potassium sulphate 
Nitric acid + sodium hydroxide (alkali) = sodium nitrate ]]> 2019-06-17 07:26:37 UTC https://padlet.com/eidlan_roslee/h8gty7rs5nfu/wish/367864556 eidlan_roslee https://padlet.com/eidlan_roslee/h8gty7rs5nfu/wish/367866950 Properties:
-pH value 
-effects on indicators
-role of water 
-corrosive 
-reaction to metal 

Indicator:
-blue/red litmus paper 
-universal indicator 
-methyl orange 
-phenolphthalein 
-pH meter

Uses:
-daily 
-business

Neutralisation:
-titration 

]]> 2019-06-17 07:41:34 UTC https://padlet.com/eidlan_roslee/h8gty7rs5nfu/wish/367866950 eidlan_roslee https://padlet.com/eidlan_roslee/h8gty7rs5nfu/wish/368010209 A little something to do with your knowledge of acids and alkalis ]]> 2019-06-18 00:15:20 UTC https://padlet.com/eidlan_roslee/h8gty7rs5nfu/wish/368010209 eidlan_roslee https://padlet.com/eidlan_roslee/h8gty7rs5nfu/wish/368010681 2019-06-18 00:19:01 UTC https://padlet.com/eidlan_roslee/h8gty7rs5nfu/wish/368010681 eidlan_roslee https://padlet.com/eidlan_roslee/h8gty7rs5nfu/wish/368011028 2019-06-18 00:21:56 UTC https://padlet.com/eidlan_roslee/h8gty7rs5nfu/wish/368011028 eidlan_roslee https://padlet.com/eidlan_roslee/h8gty7rs5nfu/wish/368012155 Enough boring science! Let’s do fun science!]]> 2019-06-18 00:32:25 UTC https://padlet.com/eidlan_roslee/h8gty7rs5nfu/wish/368012155 eidlan_roslee https://padlet.com/eidlan_roslee/h8gty7rs5nfu/wish/368012743 Red: new topic
Blue: info
Green: interesting facts 
Purple: extra info
Yellow: summary 
White: video/experiment ]]> 2019-06-18 00:36:58 UTC https://padlet.com/eidlan_roslee/h8gty7rs5nfu/wish/368012743 eidlan_roslee https://padlet.com/eidlan_roslee/h8gty7rs5nfu/wish/368017279 2019-06-18 01:16:11 UTC https://padlet.com/eidlan_roslee/h8gty7rs5nfu/wish/368017279 eidlan_roslee https://padlet.com/eidlan_roslee/h8gty7rs5nfu/wish/368020565 Which of the following maybe has a pH value of 1
A) strong acid 
B) strong alkali 
C) weak acid 
D) weak alkali 
E) neutral solution ]]> 2019-06-18 01:47:26 UTC https://padlet.com/eidlan_roslee/h8gty7rs5nfu/wish/368020565 eidlan_roslee https://padlet.com/eidlan_roslee/h8gty7rs5nfu/wish/368022511 Corrosive!

Put one drop of hydrochloric acid (concentrated) on a filter paper placed on a white tile 

Record your observation 

Repeat with sodium hydroxide (concentrated)

Have fun! ;)]]> 2019-06-18 02:06:02 UTC https://padlet.com/eidlan_roslee/h8gty7rs5nfu/wish/368022511 eidlan_roslee https://padlet.com/eidlan_roslee/h8gty7rs5nfu/wish/368024800 Some more fun awaits ]]> 2019-06-18 02:20:36 UTC https://padlet.com/eidlan_roslee/h8gty7rs5nfu/wish/368024800 eidlan_roslee https://padlet.com/eidlan_roslee/h8gty7rs5nfu/wish/368054852 Both acid and alkali have characteristics that differentiate between the two.]]> 2019-06-18 06:56:45 UTC https://padlet.com/eidlan_roslee/h8gty7rs5nfu/wish/368054852 eidlan_roslee https://padlet.com/eidlan_roslee/h8gty7rs5nfu/wish/368055160 - pH value of less than 7
- tastes sour
- corrosive 
- turns blue litmus paper red
- react with metals to produce hydrogen gas ]]> 2019-06-18 06:59:11 UTC https://padlet.com/eidlan_roslee/h8gty7rs5nfu/wish/368055160 eidlan_roslee https://padlet.com/eidlan_roslee/h8gty7rs5nfu/wish/368055571 - pH value of more than 7
- tastes bitter 
- corrosive 
- turns red litmus paper to blue
- doesn’t react to metals ]]> 2019-06-18 07:02:42 UTC https://padlet.com/eidlan_roslee/h8gty7rs5nfu/wish/368055571 eidlan_roslee https://padlet.com/eidlan_roslee/h8gty7rs5nfu/wish/368120619 2019-06-18 13:42:34 UTC https://padlet.com/eidlan_roslee/h8gty7rs5nfu/wish/368120619