Common Mistakes Flashcards
What is the burette looking piece of apparatus with a tap called ?
Separating funnel
How would the first sample of gas collected be different from the samples collected later
It contains air
What is the chemical equation for the reaction between sulphur dioxide and water
SO2 + H2O ~> H2SO3
When talking about the curve graph , which point should never be forgotten?
Whether the curve is steeper or less steep
I.e the steepness!
What are the two other raw materials minus iron ore used in the blast furnace ?
Limestone and coke
What is the chemical reaction between haematite and carbon monoxide
Fe2O3 + 3CO ~> 2Fe + 3CO2
Suggest two reasons why the volume calculated from the experiment is less than the correct values
The bung was not on tightly so some of the gas might have diffused away
The sodium carbonate is not pure
When talking about equilibrium , one should ?
Write about the side the equilibrium has moved to
- right hand side
Or
-left hand side
What is bond making ?
Exothermic
What effect would adding more sulfur of acid have on the temperature change
The temperature would be less because there is a larger volume of solution to be heated
What gas is 71.5%bif the mixture of gases in the exhaust fumes of a car?
Nitrogen
On the graph where does it show the maximum temperature rise?
Where the two lines cross
Give two features of a reaction that is in dynamic equilibrium
The forward rate equals the reverse rate
The concentrating of reactants remain constant
Why the mass of the flask and contents decreases with time ?
Carbon dioxide is given off
