mole determination Flashcards
delete ts now !!!
what is the value of gas constant
8.31
what is rtp in cm3
24000
what is the ideal gas equasion and lable the units involved
PV=cRT
volume m3
pressure Pa
temprature K
why would there be no co2 left in the delivery tube
co2 displaces the air in the delivery tube
Peion wants to measure how much carbon dioxide gas is produced when magnesium carbonate (MgCO₃) reacts with nitric acid (HNO₃).
Describe how he should set up the apparatus
[5]
Get a conical flash, place a bung with a hole in it, put a delivery tube in the hole. Get a trough of water and place the delivery tube in it and then place it in an upside-down water filled measuring cylinder or syringe to collect the gas.
whats the basic equasion to convert degrees into kelvin
x degrees +273
Nolo has set up his apparatus to collect hydrogen gas produced from the reaction between magnesium and sulfuric acid.
(a) Describe how Nolo should use the apparatus to collect the hydrogen gas.
[3]
(b) Nolo notices that some magnesium remains unreacted at the end of the experiment.
What should he do to ensure all the magnesium reacts next time?
a
Weigh 10 cm3 of sulphuric acid into a connical flask and then place 0.15g of magnnesium to the connical flask place bung into the flask immediately. Gas produced will collect in measuring cylinder
Record the final volume of hydrogen in the measuring cylinder
Weigh a dry evaporating basin then place conical flask content into it . use distilled water to rinse the conical flask 3 times and place washings in the evaporating basin.
Place evaporating basin in water bath till theres only dry solid in it
If this takes too long a bunsen burner flame under a sand bath can be used instead.
b
add more sulphuric acid in excess
what equasion links moles, concentrationa and volume
mole
concentration volume
what is rtp in dm3
24dm3
what is 25 degrees in kelvin
298
A student reacts a solid sample of basic copper carbonate (chemical formula: CuCO₃·Cu(OH)₂) with dilute sulfuric acid. A gas is produced during the reaction.
The student wants to measure the volume of gas produced.
Describe how the student could set up the apparatus to collect and measure the volume of gas displaced in this reaction.
[4]
Weigh 1.5g of cuso3.cuOH2 and add it to a conical flask
Measure 50 cm³ of H2so4 in a 50cm3 measuring cylinder, add it to a conical flask immediately add the stopper so no gas escapes. The gas will collect in the measuring cylinder
Record the final volume of co2 in the measuring cylinder
Jool has a wet sample of magnesium sulfate (MgSO₄) and wants to obtain a pure, dry sample.
Describe how Jool could do this.
he should put mixture over a sand bath in an evaporating basin till dry sample emergerges to drive off more water use a water bath
Pohs sets up his equipment to collect gas from a chemical reaction using a measuring cylinder filled with water.
State two things that could go wrong during this experiment and explain how each would affect the results.
hole in delivery tube can cause the gas to leak
gas can dissolve in water
some reactant may not react making findings less accurate
what is 95 degrees in kelvin
368
what is the ideal gas equasion and lable the units involved
PV=cRT
volume m3
pressure Pa
temprature K
