Chemistry November Mock Flashcards
Why does adding a catalyst affect rate of reaction? (Collision Theory)
- Increases rate of reaction.
-Provides Alternate route
-Lower Activation energy
-higher proportion of particles that have sufficient energy to react
Suitable name and formula for a catalyst
Manganese (IV) Oxide. MnO2
Formula for Rf (Chromatography)
Distance moved by Dye / Distance moved by the Solvent.
How to carry out chromatography experiment?
Draw start line in Pencil.
-Place food colourings along a start line.
-Place paper in beaker with start line above solvent.
-Mark solvent front.
-Remove paper and allow to dry.
Why is Xe unreactive? (Noble Gas)
As Xe has a full outer shell of electrons.
Define the Term Isotopes.
Atoms of the same element with number of protons but different number of neutrons.
Why is it better to use a pipette than a measuring cylinder?
Measurement is more precise
State the colour of methyl orange in barium hydroxide solution.
Yellow
Why is universal indicator not suitable in titration
The colour change is gradual.
State 2 observations seen when burning magnesium to form Magnesium oxide
Bright White light and a white powder.
Explain how Magnesium conducts electricity
Magnesium conducts as it has delocalized electrons, the electrons are free to move.
Explain how magnesium chloride conducts electricity
Magnesium chloride can only conduct in a molten state, as the ions are free to move.
State the name of a fraction whose Viscosity is greater than Fuel oil
Bitumen
State the name of a fraction whose Boiling point range is lower than fuel oil
Diesel,Gasoline,Refinery gases
Why is Carbon Monoxide toxic?
As it prevents oxygen transport throughout the body
What are the conditions needed for Ethane to react with Bromine and why
The reaction requires UV light as it provides energy
State the type of reaction between Ethane and Bromine
Substitution Reaction
What is the Alkane with the formula CH4?
Methane
What is the Alkane with the formula C2H6?
Ethane
What is the Alkane with the formula C3H8
Propane
What is the Alkane with the formula C4H10
Butane
What is the Alkane with the formula C5H12
Pentane
What is the Alkene with the formula C2H4
Ethene
What is the Alkene with the formula C3H6
Propene
What is the Alkene with the formula C4H8
Butene
What is the Alkene with the formula C5H10
Pentene
Reaction for Ethane with Bromine
C2H6 + Br2 —-> C2H5Br + HBr
Name the polymer that is good for non stick pans.
Poly (Tetrafluoroethene)
What is the use of Poly (Ethene)
Drinks bottles and Shopping bags
What is the use of Poly (Propene)
Storage Boxes and Climbing Ropes
What is the use of Poly (Chloroethene)
Wire Insulation and Drainpipes
Why is carbon monoxide toxic
Prevents the transportation of oxygen throughout the body.
Uses of Kerosine
Aircraft Fuel
Use of Refinery gases
Cooking oil
How is the crude oil split into fractions
The oil is heated and evaporates to become a gas
Cool at the top and hot at the top
The gases rise and condense at the point where it’s boiling point matches
Bitumen at the bottom as it has the highest boiling point and refinery gases at the bottom as it has the lowest boiling point.
