Stats: Chemistry A Level OCR B DF

General Stats

This quiz has been taken 15 times
The average score is 4 of 90

Answer Stats

Hint	Answer	% Correct
Catalysts can be changed ____ but not chemically - take some part in the reaction but are regenerated	Physically	38%
Molecule with a positive carbon atom	Carbocation	25%
Substance that speeds up reaction but can be recovered chemically unchanged after	Catalyst	25%
DF5 Where a larger molecule is made into smaller molecules	Cracking	25%
Boiling points ____ as number of carbons increases	Increase	25%
Double bond contains one of these, and one ____ bond	Pi	25%
When solid catalyst used, reaction occurs on ____ of solid	Surface	25%
DF6 Compound with C=C double bond	Alkene	13%
Reactants and catalyst are in the ____ state	Aqueous	13%
Positive ions/molecules with partial positive charge are ____ to this region	Attracted	13%
New ____ form between the reactants, held close together on catalyst surface	Bonds	13%
Carbocation is positive and reacts with ____ ion - pair of electrons move from it and bond to positively charged carbon	Bromide	13%
Convert them into less harmful gases like water vapour or ____ ____	Carbon dioxide	13%
Process of speeding up chemical reaction using catalyst	Catalysis	13%
General formula	CnH2n	13%
Name of this reaction	Electrophilic addition	13%
Where are the products of cracking separated	Fractionating column	13%
When reactants and catalyst are in different physical states	Heterogeneous	13%
In ____ catalysis, poison molecules adsorbed more strongly than reactants	Heterogeneous	13%
Addition of water to an alkene	Hydration	13%
Molecules with the same molecular formula but different arrangements of atoms	Isomers	13%
Br molecule becomes ____ as it approaches the alkene	Polarised	13%
Fe (3+) then ____ by the iodide, forming an I2 molecule	Reduced	13%
Catalysts need a large ____ ____. Often used in a finely divided form or as a fine mesh	Surface area	13%
An organic compound that has a double or triple bond between carbon atoms	Unsaturated	13%
Bonds in reactant molecules are therefore ____ and break	Weakened	13%
What catalyst is used	Zeolite	13%
Nickel also works. Must be finely powdered. Temperature ____C and pressure ____atm	150 5	0%
Poison molecules block ____ ____ causing the catalyst to become inactive	Active sites	0%
Reaction where this occurs with no byproducts	Addition polymerisation	0%
Reactants form bonds with atoms on catalyst surface - ____ onto surface	Adsorbed	0%
Molecule with -OH functional group	Alcohol	0%
This reaction will produce a ____ - but bromine water still decolorises	Bromoalcohol	0%
The positive bromine atom can now behave as electrophile. Bonds with alkene to form ____	Carbocation	0%
Ethene also reacts with hydrogen. Requires ____ to break strong H-H bond	Catalyst	0%
What does this happen in	Catalytic converters	0%
Same molecular formula, but the longest hydrocarbon chain is not the same	Chain isomerism	0%
Carbon from the decomposition of hydrocarbon molecules	Coke	0%
When more than one monomer is incorporated into the final polymer	Copolymerisation	0%
When ethene gas is bubbled through bromine, Br becomes ____	Decolorised	0%
The four electrons in the ethene double bond give the region between the carbon atoms a higher than normal ____ of negative charge	Density	0%
In laboratory - ethene converted to ethanol by adding sulfuric acid then ____ with water	Diluting	0%
Two highest priority groups are on opposite sides of the double bond	E isomer	0%
These ____ react by accepting a pair of electrons from the C=C double bond	Electrophiles	0%
Average bond ____ to break the bond in ethene is +270kJ/mol	Enthalpy	0%
Used in industrial manufacture of	Ethanol	0%
H-O-SO3H reacts with ethene to form	Ethyl hydrogensulfate	0%
Energy released from burning coke heats catalyst, and energy transferred to ____	Feedstock	0%
The mixture in the reactor is a moving ____ ____ where solid particles flow like a liquid	Fluidised bed	0%
Same molecular formula, different functional group	Functional group isomerism	0%
When reactants and catalysts are in same physical state	Homogenous catalysis	0%
Catalyst goes into regenerator, where the coke is burn off by ____ ____	Hot air	0%
The ____ will react with a carbon first	Hydrogen	0%
Reaction of ethene with hydrogen	Hydrogenation	0%
Ethene also readily reacts at room temperature with a solution of ____ ____	Hydrogen bromide	0%
Two electrons are arranged between the atoms in an area of ____ ____ ____	Increased electron density	0%
Catalyst in reaction between peroxidisulfate (2-) and iodide (I-) = ____ (2+)	Iron/Fe	0%
This is why ____ petrol can't be used in cars fitted with catalytic converter (lead strongly adsorbed to catalyst)	Leaded	0%
Consists of two areas of ____ ____, one above and one below the line of the atoms	Negative charge	0%
Both ions are ____ charged so the reaction takes a lot of energy	Negatively	0%
If feedstock for Haber process contains sulfur compounds, these must be removed to prevent poisoning of ____ catalyst	Nickel/Ni	0%
Can also shake alkene with bromine water. Water molecules act as ____ so compete with bromide ions	Nucleophiles	0%
It first ____ S2O8 to form 2 sulfate (2-) ions and 2 Fe (3+) ions	Oxidises	0%
Occurs at high temperature, high pressure, and in presence of catalyst (____ ____ adsorbed onto solid ____)	Phosphoric acid silica	0%
Stereoisomers exist because you can't rotate one end of the molecule due to the ____ bond	Pi	0%
If ____ catalyst used, can take place under standard laboratory conditions	Platinum	0%
When a catalyst is blocked from being able to function properly	Poison	0%
Catalytic converters help reduce toxic ____ released into air	Pollutants	0%
DF7 A long molecule made up from many small monomers	Polymer	0%
Sometimes supported on ____ material to increase SA and prevent crumbling	Porous	0%
Same molecular formula, functional group in a different place	Position isomerism	0%
Weakens bonds to catalyst surface and ____ molecules are released	Product	0%
Logically deciding movement of electrons using ideas like bond polarity and charges	Reaction mechanism	0%
The catalyst needs to be ____ when this forms on the catalyst surface	Regenerated	0%
When the surface of a catalyst is cleaned and usable again	Regeneration	0%
Electrons in bromine ____ by alkene electrons and pushed back along molecule	Repelled	0%
What is the reactor called	Riser reactor	0%
It's called this because of the overlap of ____ orbitals	S	0%
Used to ____ fats and oils	Saturate	0%
After the riser reactor, the mixture passes into a ____	Separator	0%
Single bond	Sigma	0%
What are the hot vaporised hydrocarbons and catalyst forced up by	Steam	0%
Same molecular formula, same structural formula but differ in how atoms arranged in space	Stereoisomerism	0%
Same molecular formula, atoms bonded together in different order	Structural isomerism	0%
Use expensive metals - cheaper ones more vulnerable to poisoning by trace amounts of ____ ____	Sulfur dioxide	0%
This reacts with water to form ethanol and ____ acid	Sulfuric	0%
DF9 Shape of methane	Tetrahedral	0%
Many heterogeneous catalysts are	Transition metals	0%
Cracking can occur ____ additional heating	Without	0%
Two highest priority groups are on the same side of the double bond	Z isomer	0%

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Chemistry A Level OCR B DF - Statistics