2012 A Level GCE English Part 1 Question 1

Grammar (40 marks)
1. Fill in each blank with a suitable preposition from the list given below.Use each preposition only once.
(10 marks)
on        of      into         with         in               out of                 over            round               for          towards

A small truck loaded(1) ................... glassware backed out of a factory driveway into the path of a large truck.Most  of the glass was broken (2) ........................... the crash and the driver seemed (3) ................... the verge of tears.  A big crowd gathered and a benevolent old gentleman said compassionately," I suppose you will have to make this good(4) .................... your own pocket?"




the answers will be posted tomorrow

wish u all the best for the exam

Sri Lankan A level English paper April 2005 Part 1 sample questions

Sri Lankan A level English paper April 2005 Part 1 sample questions

• a = indefinite article : a object, th efirst letter of the word should not be a vowel(a e  u o i) 
  She has a dog.
  I work in a factory.
• an = indefinite article  with first letter as a  vowels (a,e,i,o,u)
  Can I have an apple?
• There is an object under the tree.
  She is an English teacher.
• He studies in an english medium school.
• the = definite article (a specific object that both the person speaking and the listener know)
  The car over there is fast.
  The teacher is very good, isn't he?
• The first time you speak of something use "a or an", the next time you repeat that object use "the". 
  I live in a house. The house is quite old and has four bedrooms.
  I ate in a Chinese restaurant. The restaurant was very good.
• DO NOT use an article with countries, states, counties or provinces, lakes and mountains except when the country is a collection of states such as "The United States".
  He lives in Washington near Mount Rainier.
  They live in northern British Columbia.
• Use an article with bodies of water, oceans and seas - 
  My country borders on the Pacific Ocean
• DO NOT use an article when you are speaking about things in general 
  I like Russian tea.
  She likes reading books.
• DO NOT use an article when you are speaking about meals, places, and transport
  He has breakfast at home.
  I go to university.
  He comes to work by taxi.

Types of organic reactions

Basically there are  6 types of organic reactions, lets see what they are and where they occur:
1.Combustion reaction
All organic compounds are combustible( they react with oxygen ) , the carbon in the organic compound forms CO2 and the Hydrogen present is converted to H2O .
If there is S it is converted to S02 .

2. Free radicle substitution reaction:


will be continued in two days : sorry for the inconvinience

A2 question for 13- 16 of July 2014

Notice to AS and A2 students

You are requested to complete your assignment and if possible submit them on Monday, with your exam file.

A2 questions for 11.07.2014 and 12.07.2014

AS 11.07.2014 and 12.07.2014

Grade 9C question 09/07/2014

Questions for A2 students 09/07/2014

Dear A2 students , please complete the following questions in a new copy ( indicate the date ) and write the answers in a legible manner. The monitor (Veno) is requested to collect the copies tomorrow and submit them during the second period( list of names of students who did not attempt the question also needed).

1. Write four properties of phenol?
2.Why benzene does not answer to test of acidified KMnO4

3.

AS Questions for 09/ 07/ 2014

Dear AS students , please complete the following questions in a new copy ( indicate the date ) and write the answers in a legible manner. The monitor (Karu) is requested to collect the copies tomorrow and submit them during the second period( list of names of students who did not attempt the question also needed).

1.Define relative atomic mass of an element.
2.What are the two types of pairs of electrons?
3. Write the complete electronic structure of K ( mass no -39, atomic no-19)

A2 Chemistry Full Cambridge syllabus exploration Start:

I wish to inform you all that the A2 Chemistry Syllabus full exploration will be statrted on the 16th of June 2014, with daily follow ups and questions.:
So stay tuned in !

A S Cambridge MCQ Elaboration and explanation 2012 May/June Paper 13 By N.Veeradinesh

Question No 1

The question tests on simple application of Le Chateliers law=> If a Change is made to a system which is at equilibrium then th e equilibrium will shift in a direction to oppose or minimize the change

. 
 The question emphasizes to select a change that does not increase the rate of the forward reaction, this statement is equivalent to saying which change increases the rate of the backward direction.
The forward reaction is a exothermic process so to increase the rate of backward reaction which is endothermic , we have to increase the temperature. So the absolute option is C.
Lets look into option A. Addition of a catalyst or increasing the surface area of the  of the catalyst  by decreasing the size of the catalyst pieces  does not selectively increase the rate of backward or forward reaction because the rate of both reactions are equally increased. So in this case also the rate of forward reaction is increased , as well as the rate of the backward reaction.
Consider option B.Increasing the pressure will try to shift the equilibrium in a direction where the total number of molecules is lesser , so that the pressure can be reduced. In the Haber Process equation the number of molecules on the reactant side is 4 ( one N2 and three H2) and the number of molecules on the product side is 2.So  when the pressure is increased the forward process is favoured .
 According to option D, removal of ammonia from the system as it is formed will make the system to produce more ammonia, so the rate of the forward direction has to be increased  to make more ammonia.
 Question No 2 Reference to a species which has a incomplete outer shell is shown here. This means a atom or ion which has not eight electrons in its outer most shell .Let  consider the options individually,BThe forward reaction is a exothermic process so to increase the rate of backward reaction which is endothermic , we have to increase the temperature. So the absolute option is C. Lets look into option A. Addition of a catalyst or increasing the surface area of the  of the catalyst  by decreasing the size of the catalyst pieces  does not selectively increase the rate of backward or forward reaction because the rate of both reactions are equally increased. So in this case also the rate of forward reaction is increased , as well as the rate of the backward reaction.Consider option B.Increasing the pressure will try to shift the equilibrium in a direction where the total number of molecules is lesser , so that the pressure can be reduced. In the Haber Process equation the number of molecules on the reactant side is 4 ( one N2 and three H2) and the number of molecules on the product side is 2.So  when the pressure is increased the forward process is favoured . According to option D, removal of ammonia from the system as it is formed will make the system to produce more ammonia, so the rate of the forward direction has to be increased  to make more ammonia. Question No 2 Reference to a species which has a incomplete outer shell is shown here. This means a atom or ion which has not eight electrons in its outer most shell .Let  consider the options individually,BThe forward reaction is a exothermic process so to increase the rate of backward reaction which is endothermic , we have to increase the temperature. So the absolute option is C. Lets look into option A. Addition of a catalyst or increasing the surface area of the  of the catalyst  by decreasing the size of the catalyst pieces  does not selectively increase the rate of backward or forward reaction because the rate of both reactions are equally increased. So in this case also the rate of forward reaction is increased , as well as the rate of the backward reaction.Consider option B.Increasing the pressure will try to shift the equilibrium in a direction where the total number of molecules is lesser , so that the pressure can be reduced. In the Haber Process equation the number of molecules on the reactant side is 4 ( one N2 and three H2) and the number of molecules on the product side is 2.So  when the pressure is increased the forward process is favoured . According to option D, removal of ammonia from the system as it is formed will make the system to produce more ammonia, so the rate of the forward direction has to be increased  to make more ammonia. Question No 2 Reference to a species which has a incomplete outer shell is shown here. This means a atom or ion which has not eight electrons in its outer most shell .Let  consider the options individually,BThe forward reaction is a exothermic process so to increase the rate of backward reaction which is endothermic , we have to increase the temperature. So the absolute option is C. Lets look into option A. Addition of a catalyst or increasing the surface area of the  of the catalyst  by decreasing the size of the catalyst pieces  does not selectively increase the rate of backward or forward reaction because the rate of both reactions are equally increased. So in this case also the rate of forward reaction is increased , as well as the rate of the backward reaction.Consider option B.Increasing the pressure will try to shift the equilibrium in a direction where the total number of molecules is lesser , so that the pressure can be reduced. In the Haber Process equation the number of molecules on the reactant side is 4 ( one N2 and three H2) and the number of molecules on the product side is 2.So  when the pressure is increased the forward process is favoured . According to option D, removal of ammonia from the system as it is formed will make the system to produce more ammonia, so the rate of the forward direction has to be increased  to make more ammonia. Question No 2 Reference to a species which has a incomplete outer shell is shown here. This means a atom or ion which has not eight electrons in its outer most shell .Let  consider the options individually,BF₃ :
Question no 3
Ionization energy is the amount of energy needed to to remove one mole of electron from the outermost shell of a species in the gaseous state.When a electron is removed from  a neutral species to form a unipositive ion it is called as the first ionization energy. Removal of a electron from a unipositive ion to form a dipositive ion is called as the second ionixation energy,Erg:   CaàCa⁺………………..1
      Ca⁺àCa²⁺ ……………………………….2The fist equation is that for the first inozation of CaThe second equation is the second ionization for calcium.Consider:CaàCa²⁺

This is not the equation for the second ionization energy but represents the sum of the first and second ionization enthalpy.And also always ionization energy is a endothermic process , so the sign of the enthalpy change should be positive. =>∆H o = +So the correct option is B.Question 4The question is easy to handle.

This reaction can be considered as both the equation for the formation of H2O ( water) or that of the combustion of H2(g) .You might not know whether the formation enthalpy of h2o is exothermic but you certainly know that the combustion enthalpy of h2 is exothermic.As both reaction are the same, the same amount of heat is liberated by hess’s law.So the correct option is D.Question 5Always when faced with such a question immediately try to analyse the data and draw a triangle of balanced equations inorder to apply Hess’s law and find the unknown value . CH3COCH3 +3O2 ----------à2CO2 + 3H2O
H2 + 1/2 O2 ----à H2O
C+ O2 --à CO2Now lets draw the triangle: –1786 kJ mol–1. CH3COCH3 +3O2 ----------à2CO2 + 3H2O
–286 kJ mol–1 X 3Unknown Y –394 kJ mol–1 X 2 3H2 + 2C + 7/2 O2
The unknown Y representsthe enthalpy change of formation of propanone.So by the application of Hess’s law:Y + –1786 kJ mol–1 = –286 kJ mol–1 X 3 +–394 kJ mol–1 X 2
By doing the math:Y= –254 kJ mol–1So the correct answer is option CQuestion No 6Consider the shapes of each of the species given in the question. Question No 7The question is so simple only easy substitution and the rest is mathamatics .But remember all the quantities in the ideal gas equation have to be put in the SI unit before you substitute,So lets first do thatP(Pressure) = 102 kPa = 102000 PaT(absolute temperature)= 30 C = 30+273 K = 303 KN(moles) = mass/molar mass` = 0.56g/30gmol-1 =0.01866 mol molar mass of ethane (C2H4) = 30 gmol-1 PV=nRTV= Nrt/PV= M3=cm3So the correct option is
Question 8Just to remind , the properties of a ideal gas:The molecules have neither attraction or repulsion forces between them.The volume of a single molecule can be neglected compared to the total volume of the vessel.The collisions between the molecules are perfectly elastic.But we all know that ideal gas is a imaginary concept and such a gas does not really exist, but some real gases like the noble gases behave more ideally than other gases. So now our task is to select appropriate condition in which a real gas would more likely show ideal nature.Consider the temperature, the temperature has to be very high for a real gas to exhibit ideal nature, because then only 1.the molecules of gas will be moving very fast and chance for attraction between molecules is less2.According to Charles law when the temperature increases the volume also increases ,to the volume of the molecules is more negligle compared to that of the vessel.From the above explanation , you would certainly understand that the pressure of the system need to be low for the gas to show ideal nature, because at low pressure the total volume of the gaseous system is higher so the volume of the gas molecules is more negligible .Question 9A thorough understanding of the process by which Al is extracted from bauxite would be very much usefulful to tackle this question.Lets consider each options individually,
Option A:In this process Al2O3 is molten with cryolite , remember Al2O3 is a ionic compound.But AlCl3 is a covalent compound,Extraction of substances throught the method of electrolysis is not possible for covalent substances, because here ions can not be formed .Al2O3 dissociates into Al3+ and O2-.Al3+ is a cation and moves towards the negatively charged cathode,
Always remember that oxidation takes place at the anode and reduction takes place at the cathode.
Reaction at cathode:Al3+ + 3e -àAl
Reaction at anode :2O2- àO2 +2e
So Al3+ move towards the cathode and are reduced.

Important points to remember in chemistry

F has the highest electronegativity

Cl ha the highest electron affinity

Cs has the lowest ionization energy

He has the highest ionization energy.

Try out this link , it should financially help you

     http://payloog.com/?invite=422259
\








EARN $50 USD Daily Easy From Us

Applied Biology A Level