June 2022 Paper 2 Flashcards
(15 cards)
What is the effect on the yield of increasing the temperature of a Kc equilibrium reaction?
–Yield increases
-the reaction opposes the increase in temperature
-equilibrium shifts in opposite direction
What environmental problem can chlorodiflouromethane cause?
-causes ozone depletion/ damages ozone
Why would refrigerators use pentane as a refrigerant instead of chlorodiflouromethane?
-Pentane does not contain flourine
Units of Kc (can change)
-moldm-3
Why is a minor product formed?
How many carbons does hexane have?
-6
Why are disulfide bonds stronger than H bonds?
-bc disulfide bonds are covalent, covalent stronger than H bonds
Why would you wear gloves when dealing with conc phosphoric acid?
-conc phosphoric acid is corrosive
Give an equation for the overall reaction when benzene reacts with methanoyl chloride
-C6H6 + HCOCl → C6H5CHO + HCl
What is the name of the organic product when benzene reacts with methanoyl chloride?
-Benzaldehyde
Identify the catalyst when when benzene reacts with methanoyl chloride
-AlCl3
Give an equation to show how the catalyst is used to form the electrophile, [HCO]+
-HCOCl + AlCl3 → [HCO]+
+ [AlCl4]
Why might a smaller titre not be appropriate
-smaller titre will increase uncertainty
State the reason for inverting the flask several times.
-To ensure the solution is homogeneous
What is z in m/z
-the charge of a hydrogen ion?
