Group 2 Flashcards
State one method the student could use for removing soluble impurities from the sample of magnesium hydroxide that has been separated
Add a small amount of cold water
If there is only one product what is the percentage yield
100 percent
What element from mg to ba is the most soluble in water
Barium hydroxide
2 observations when magnesium reacts with steam
White light formed
And white precipitate formed
You are given a sample of saturated calcium hydroxide solution, outline the practical steps that you would take to determine the solubility of calcium hydroxide in this solution
Take a known volume of the saturated solution evaporate the filter to dryness and weigh the residue.
Write an ionic equation to show how calcium reacts w excess water
Ca(s)+2h20(l)—>ca2+(aq) +2OH-(aq)+ H2(g)
Magnesium burns with a bright white light, why should water not be used to put out a fire where magnesium is burning
As hydrogen is produced and hydrogen is flammable. As when it reacts w water hydrogen is produced innit alaynah… mg0h+h2
What is calcium hydroxide used for
Neutralising acidic soils to help farmers grow plant so like agriculture but also LIME( used for the removal of sulfur dioxide from flue gases)
Give the formula of the hydroxide of the element in group 2 that is the most soluble in water
Ba(OH)2
Explain why different observations are made when aqueous barium chloride is added separately to aqueous magnesium sulfate and to aq magnesium nitrate
As bas04 is insoluble and no reaction occurs in the second case as barium nitrate remains in a solution so the reactions differ.
The equation for extracting titanium using magnesium
TiCl4(l)+Mg(s)—>2MgCl2(g)+Ti(s)
Identify a sodium halide that does not undergo a redox reaction when added as a solid to concentrated sulfuric acid
NaF or NaCl
Chlorine gas reacts with cold dilute sodium hydroxide to form sodium chloride and another chlorine which one
NaClO
Why is it important to clean the surface of magnesium ribbon when investigating its rate of reaction
Bc the mg is coated with an oxide so it has to be removed before it reacts
You are given a sample of saturated calcium hydroxide. Outline the practical steps that you would take to determine solubility of calcium hydroxide in this solution
Take a known volume of the saturated solution, evaporate the filtrate to dryness and weigh the residue.
Equation for the thermal decomposition of zinc carbonate to zinc oxide
ZnCO3—> ZnO+CO2
Magnesium sulfate test w h2so4 and naoh
No visible change w h2so4 and gives white ppt with NaOH
Barium carbonate w h2so4
Carbonate ion releases co2 bur baso4 formed highly insoluble
The method the scientists used could not detect one type of halide ion. Identify this halide ion
Silver fluoride which is soluble therefore no ppt would for, so no observable change
Why is drinking magnesium sulfate effective in the treatment of barium poisoning
Bc it forms insoluble barium sulfate
give a medical use for the magnesium compouhnd formed in the reac of magnesium and cold water
magnesium hydroxide, used for treatment of indigestion
give the formula of the substance responsible for the orange colour when chlorine is bubbled through an aqueuous solution of sodium bromide
br2
solid sodium iodide undergoes a redox reaction with conc sulfuric acid, give the formula of each of the following in this reac. the formula of the solid reduction and oxidation product
s2 red. ox- i2
state why sulfuric acid should not be used to acidify bacl when testing for sulfate ions
bc it contains sulfate ions, this would form a white precipitate, false pos
pure mg reacts completely with an excess of dilute sulfuric acid, the reaciton of pure calcium with an excess of dilute sulfuric acid is very rapid initially. this reaction slows down and stops before all teh calcium has reacted. why are the reactions different
magnesium sulfate is soluble and calcium sulfate is insoluble so coats the calcium preventing it to react further
identify what precipitate does not dissolve in conc ir dilute ammonia
SILVER iodide AgI. not just iodine
how to distinguish between silver nitrate and aqueous sodium nitrate
use hcl of course, bc silver nitrate so it will form a white ppt
how to distinguish aq magnesium chloride and aq barium chloride
in this case, bc barium chloride. use naso4 or whatever sulfate, and it would form a white ppt with barium chloride
what would magnesium sulfate form with NaOH
white precipitate
if a hydroxide reacts with a sulfate or sulfuric acid what will form
a sulfate compound which means a white ppt will be observed
state one way of removing an aq solution from another one
fractional distillation
why would nitric acid be replaced by barium sulfate in a reaction
because barium sulfate is insoluble so easier to remove
explain how metals conduct elec
delocalised electrons FLOW in a GIVEN direction
if ycl2 forms w white ppt with NaOH what is y
magnesium. bc magnesium turns white w naoh
if ycl2 has no ppt what can y be now w naoh
barium bc that wouldnt do anything right bacl
why can carbonates not be present in a reac that has been reacted w hno3
bc the carbonates have reacted w the acid
what state is mg(oh)2
solid
