11.3 Reactions With Oxygen Flashcards
(19 cards)
What happens when group 2 elements react with oxygen?
The metals form white solid oxide
Why does barium metal need to be kept under oil?
To keep it out of contact with the air
How is flame test carried out?
A nichrome wire cleaned with hydrochloric acid dipped into the sample of salt to be tested
What is the positive result for calcium in a flame test?
Brick red colour
What is the positive result for strontium in a flame test?
Scarlett/red colour
What is the positive result for barium in a flame test?
Apple green colour
The basic oxides of the group 2 metals can be neutralised by
Dilute acid
Magnesium can react with steam. What about calcium
It can react with water at room temperature
Describe the reaction of calcium with the water
The reaction gives of a steady stream of hydrogen gas and forms a cloudy white suspension of slightly soluble calcium hydroxide. the calcium hydroxide that does dissolve forms the solution that we call lime water
What happens when group 2 hydroxide are dissolved in water?
They form ions of metals and hydroxide
The solutions formed from the reactions of group 2 metal oxides with water
gets more alkaline going down the group
The solubility of group 2 hydroxides
Increases going down group 2
What is saturated solution?
A solution which can dissolve no more solute at a particular temperature
What is the colour of barium sulphate?
White precipitate
What is the colour of barium sulphate?
White precipitate
What happens when metal carbonate reacts with acid?
Salts are formed along with water and carbon dioxide
The metal carbonates of group 2 decompose when heated
In order to give metal oxide and carbon dioxide
The nitrate breakdown to give
Metal Oxide nitrogen(IV) oxide and oxygen
A higher temperature is needed to decompose group 2 carbonate and nitrates when
Going down the group
