acid and alkali
What is the definition of an acid ?
A chemical compound that releases hydrogen ions when DISSOLVES in WATER
Acid will turn universal indicator to ____?
State the colour change.
Ie: From ___ to ____
Green to Red, Orange or Yellow
Give 3 properties that ALL metals have
good electrical conductor
malleable
ductile
Definition of decomposition
breaking down of compound to simpler substances
Name 3 amphoteric oxides
Lead oxide
Aluminium oxide
Zinc oxide
What is the definition of an alkali?
Thymolphathalein was dripped in potassium hydroxide.
Name the colour change.
blue
What is the definition of an alloy ?
It is a mixture of more than one element to enhance the metal's properties.
calcium oxide is also known as ______
quicklime
Name the acidic oxide(s) that causes acid rain.
sulfur dioxide
nitrogen dioxide
All alkali are bases , but not all bases are alkali. Explain this statement
Alkali are bases that are soluble in water
Other bases that are not alkali are insoluble in water
Definition of indicator
A substance that is made up of dyes that changes colour when an acid/ an alkali is added to it
Name 3 alloys containing copper
brass, bronze, duralumin/sterling silver
Quick lime is added with a little water to produce ________.
The chemical name is also known as _____.
slaked lime
calcium hydroxide
Copper carbonate was heated strongly.
This reaction produces a black solid, and a gas that forms white precipitate when bubbled through limewater.
NAME the TYPE of reaction and the GAS produced.
Type of reaction : thermal decomposition
Gas produced: carbon dioxide
Ammonium chloride reacts with solution X to produce a gas that is pungent and turns damp red litmus paper blue.
Name solution X , and name the gas produced.
sodium hydroxide/ other alkali
ammonia gas
You have collected rain water to test with universal indicator. You realised that it is a weak acid
Name the colour change
yellow
what is the constituent of stainless steel?
Give the unique property of stainless steel .
iron , chromium , nickel , carbon
corrosion resistant
the common name of calcium carbonate is known as ________
When calcium carbonate is heated strongly, it breaks down to produce ________ and ___________.
lime stone
calcium oxide , carbon dioxide
silver nitrate+ potassium chloride--> ??
What are the products ? ; and what type of reaction is this ?
silver chloride+ potassium nitrate
precipitation
What is the purpose of performing titration in the lab?
Name ALL apparatuses required for this process
To perform neutralisation and obtain salt.
burette, pipette, conical flask, white tile, retort stand
Solution X turns methyl orange to red and turns universal indicator to red.
It also reacts with metal to product hydrogen gas
What is solution X?
An acid
Name the constituent of the following alloys:
sterling silver
solder
brass
duralumin
silver + copper
tin + lead
copper + zinc
aluminium + copper
Name 4 different decomposition reactions to break down compound.
thermal decomposition
hydrolysis
electrolysis
photolysis
Silver chloride turns black when exposed to sunlight. What type of reaction is happening here?
Complete the equation below:
silver chloride --> ______ + ________
photolysis
silver , chlorine