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17/07/19

Retweetd From Harris Federation Classics

Roman Londinium walk with ‘s youngest Classicists. https://t.co/UleiuSSVjc

17/07/19

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A fantastic event for HACH students interested in medicine last week with - some strong stomachs needed!! Well done to all involved. https://t.co/bqCxwlEumD

17/07/19

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Some fabulous artwork on display this morning! https://t.co/FUL7CN3Gto

16/07/19

Wasn’t it just amazing 😁

16/07/19

Half way through our fantastic summer show. Time for a drink and some food 😁 🎉 https://t.co/ylcEsc5veb

14/07/19

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https://t.co/1QBLVgu2Ss

14/07/19

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YMCA! https://t.co/zmuRXZmELv

14/07/19

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End of stay disco https://t.co/Cr5PSMBZZQ

14/07/19

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Group 2 ready for activity 4! https://t.co/foBy9cQPJN

14/07/19

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Survival skills! https://t.co/DR4d8MiUhR

14/07/19

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Activity 4! https://t.co/K1E4rTSnPx

14/07/19

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This weekend is all about teamwork! https://t.co/zJ1x7uoOQm

14/07/19

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Group 1 on the Trapeze! https://t.co/czWHu97Ufp

14/07/19

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Activity number 3! https://t.co/hkM4cLBm1Q

14/07/19

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Lunchtime! https://t.co/uHavdxPP5C

14/07/19

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Activity 2! https://t.co/5FmwSCcgMM

14/07/19

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Activity 1! https://t.co/Fgaf7vhcT8

13/07/19

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Passport to the world winners! https://t.co/aBsRp5ZYB3

13/07/19

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https://t.co/890eqpNnG0

13/07/19

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We have had a busy day today! Zip wire, vertical challenge, orienteering, beach walk & Trapeze. https://t.co/VeUdZQ5YQ2

Harris Academies
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Westminster

Chemistry

Summer Work A level Chemistry

1)  a)  What is the difference between an element and a compound?                                         (2)

         

     b)  All substances are made up of three types of particle: atoms, molecules or ions.  Explain what atoms, molecules and ions are.                                                                                                      (3)

         

     c)  Identify each of the following particles as an atom, molecule or ion.                                   

            

                   NH3        O2-      SO42-       F2        O        O2        NO3-       H2O       Cl        H+         (10)

 

2)      Write the formula of the following substances.  Some are ionic, some are atomic and some are molecular.

         

     a)  lithium oxide                                              e)  ammonia

         

     b)  calcium nitrate                                           f)  nitrogen

         

     c)  methane                                                    g)  argon

         

     d)  ammonium sulphate                                 h)  iron (III) hydroxide                                        (8)

 

3)      Balance the following equations.

         

     a)  Fe  +  H2O  ®  Fe3O4  +  H2                                                                                                (1)

         

     b)  PCl3  +  H2O  ®  P(OH)3  +  HCl                                                                                        (1)

         

     c)  ammonia  +  oxygen  ®  nitrogen  +  water                                                                       (2)

         

     d)  ethane  +  oxygen  ®  carbon dioxide  +  water                                                                 (2)

 

4)      Complete the following calculations, giving your answers to three significant figures.

 

     a)  32420 + 762891  b)  12000 ÷ 1000           c)  0.06438 + 0004378  d)  180 ÷ 90                 (4)

 

5)      The following results are accurately measured values from experiments.  Complete the sum and give the answer to the most number of significant figures that you think gives an answer that is trustworthy.

 

     a)  1.4567 + 2.3        b)  10.5 - 0.145              c)  3.000 - 0.056           

     d)  8693.457 + 1.2367                                                                                                                        (4)

 

 

 

6)      Rearrange the following equations to give the letter shown as the subject.

 

      a)   What does c equal if       q = mcT ?                          d)   What does n equal if       PV = nRT ?

     

      b)   What does T equal if       G = H - TS                         e)   What does c equal if        2a = 3(b – 2c)

 

      c)   What does q equal if       E = 3pq                              f)    What does T equal if       F = mc + Rk                           (6)

                                                                2r                                                                                                   T

 

Challenge for the week

 

 

7)      Balance the following equations.

 

     a)  KMnO4  +  HCl  ®  KCl  +  MnCl2  +  Cl2  +  H2O                                                               (2)

 

     b)  As4O6  +  S2Cl2  +  Cl2  ®  AsCl2  +  SO2                                                                           (2)

 

 

Total - 47                     

 

1)      Write the formula of the following substances. 

            

     a)  strontium hydroxide                                  f)  scandium (III) chloride

            

     b)  lithium iodide                                             g)  nitrogen

            

     c)  sulphur                                                      h)  ammonium carbonate

            

     d)  potassium oxide                                        i)   phosphorus

            

     e)  silicon                                                        j)   potassium                                                   (10)

 

2)      Balance the following equations.

            

     a)  methane  +  oxygen  ®  carbon monoxide  +  water                                                         (2)

            

     b)  sodium hydrogencarbonate  +  nitric acid  ®  sodium nitrate  +  carbon dioxide  +  water (2)

            

     c)  ammonia  +  sulphuric acid  ®  ammonium sulphate                                                        (2)

            

     d)  phosphorus  +  oxygen  ®  phosphorus (V) oxide                                                             (2)

 

3)      Convert the following to ionic equations:

            

     a)  silver (I) nitrate (aq)  +  potassium iodide (aq)  ®  silver (I) iodide (s)  +  potassium nitrate (aq)     (2)

            

     b)  sodium carbonate (aq)  +  hydrochloric acid (aq) 

                                                                            ®  sodium chloride (aq)  +  water (l)  +  carbon dioxide (g) (2)

            

     c)  potassium hydroxide (aq)  +  sulphuric acid (aq) ®  potassium sulphate (aq)  +   water (l) (2)

            

     d)  sodium hydrogencarbonate (aq)  +  hydrochloric acid (aq)

                                                                            ®  sodium chloride (aq)  +  water (l)  +  carbon dioxide (g) (2)

 

4)   a)   The mass of one mole of 23Na atoms is 22.9898 g.  Given that the Avogadro constant equals 6.0225 x 1023 and the mass of one electron equals 9.1091 x 10-28 g, calculate the mass of one mole of 23Na+ ions.                                                                                (2)

                                     

      b)   i)    Calculate the mass of one mole of 1H atoms given that the Avogadro constant equals 6.0225 x
      1023, the mass of one electron equals 9.1091 x 10-28 g and the mass of one proton equals 1.6725 x
      10-24 g.

 

             ii)   The relative atomic mass of hydrogen equals 1.0079.  Explain the difference between this value
      and your answer to (i).                                                                                                                                                   (3)

 

5)      Complete the following calculations, giving your answers to three significant figures.

 

     a)  87340 + 128713       b)  2400 ÷ 100          c)  0.0125 + 0.00762     d)  23.45 + 0.173         (4)

 

6)      The following results are accurately measured values from experiments.  Complete the sum and give the answer to the most number of significant figures that you think gives an answer that is trustworthy.

 

     a)  10.175 + 0.1             b)  278.0 – 0.16        c)  3270 – 71.4              d)  35.36781 + 0.123   (4)

 

7)      Rearrange the following equations to give the letter shown as the subject.

            

     a)  What does b equal if                                     T = 2ab/c                  c)  What does T equal if PV = nRT

            

     b)  What does c equal if                                      E = mc2                    d)  What does p equal if B = A(2r – p)  (4)

 

 

Challenge for the week

8)  a)  Calculate the expected mass of one mole of 31P atoms given that the Avogadro constant equals 6.0225 x 1023, the mass of one electron equals 9.1091 x 10-28 g, the mass of one proton equals 1.6725 x 10-24 g and the mass of one neutron equals 1.6748 x 10-24 g.                            (3)

     b)  The actual mass of one mole of 31P atoms is 30.9738 g.  Try to account for the difference between this value and your answer to (a).                                                                                      (2)

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