- Last 7 days
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filestore.aqa.org.uk filestore.aqa.org.uk
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• si te gustaría visitar un festival en España en el futuro.
If you would like to visit spain in the past.
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ué haces con el ordenador
What you do on the computer.
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ué hiciste con tu familia durante un día divertido en el pasado
What you did on a fun day in the past.
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- Apr 2024
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pmt.physicsandmathstutor.com pmt.physicsandmathstutor.com
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What is it exactly that I want, Harry?’
Back in those times, she isn't able to think for herself - a man has to think for her, make all of the decisions for her. Doesn't want anything for herself, only to please the husband.
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a girl with beautiful red hair and a white skin and eyes thecolour of that green ribbon shot with gold they had got from Paris last week. Rosabel hadseen her carriage at the door; a man had come in with her, quite a young man, and so welldressed
Maybe jealousy - stated in the prologue that she is lower class; this new girl arrives in a wealthy carriage.
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Rosabel thought shewould have sacrificed her soul for a good dinner, something hot and strong and filling.
Shows how hard she's been working; emphasises using the quote: "sacrificed her soul for a good dinner"; How unfortunate she is - can't get a good dinner as easily as now.
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filestore.aqa.org.uk filestore.aqa.org.uk
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Complete the equation for the reaction of potassium with water.You should balance the equation.[2 marks]K + H 2O → +
2K + 2H2O ---->2KOH +H2
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Give two observations you could make when a small piece of potassium is addedto water.
- effervescence
- lilac flame
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Evaluate the three possible methods for extracting tungsten from tungsten oxide.
Extraction with carbon isn't effective as you don't get pure tungsten; you only get tungsten carbide. Extraction with hydrogen in the most effective, as you get pure tungsten - no need for further extraction. Extraction by iron is also effective; you get 2 solids - pure tungsten and iron oxide.
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arbon is used to extract tin (Sn) from tin oxide (SnO2).The equation for the reaction is:SnO2 + C → Sn + CO2Calculate the percentage atom economy for extracting tin in this reaction.Relative atomic masses (Ar ): C = 12 O = 16 Sn = 119
atom economy formula: Total Mr of desired products / Total Mr of all reactants Mr of Tin:119 (desired product) Mr of SnO2 + C = 119+32+12 = 163 (all reactants) 119/163 = 0.73 As a percentage:73%
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Identify element R.You should use:• your answer to question 03.1• the periodic table.[1 mark]Identity of R =
ruthenium
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The sum of the relative formula masses (Mr ) of the reactants (3 H2 + RO3) is 150Calculate the relative atomic mass (Ar ) of R.Relative atomic masses (Ar ): H = 1 O = 16
2+48+x=150 50+x=150 x=100
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Gallium was discovered six years after Mendeleev published his periodic table.Give two reasons why the discovery of gallium helped Mendeleev’s periodic table tobecome accepted.
reason one: Gallium fit into the gaps that Mendeleev left in the periodic table. reason two: It fit into its group with similar properties.
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What is the most likely formula of a gallium ion?
Ga3+
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Gallium (Ga) is in Group 3 of the modern periodic table.0 2 . 3 Give the numbers of electrons and neutrons in an atom of the isotope Ga
Electrons: 31 Neutrons: 38
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Calculate the relative atomic mass (Ar ) of gallium.Give your answer to 1 decimal place.[2 marks]Relative atomic mass (1 decimal place) =
(6960)+(7140), all divided by 100, which equals: 69.8.
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Give the meaning of ‘isotopes’.You should answer in terms of subatomic particles.
When two atoms of the same element have different numbers of neutrons.
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Explain why graphite is:• a good electrical conductor• soft and slippery.You should answer in terms of structure and bonding.[6 marks]
Each carbon atom in graphite only makes 3 covalent bonds, meaning that it has delocalised electrons available to carry the charge throughout the structure. It is soft and slippery due to the layers sliding over eachother due to weak intermolecular bonds.
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Why does propanone have a low boiling point?
The covalent bonds are weak
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Molecular formula =
C3H6O
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Give one use of a fullerene
Transport drugs around the body accurately
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What shape is a Buckminsterfullerene molecule?
A sphere
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