3.3 The cartoon indicates a battle between non-renewable and renewable resources. Explain why you believe that this battle is happening. (4)

  QUESTION 1   The table below shows the melting points, boiling points and densities of substances A to D.   Substance Melting point (°C) Boiling point (°C) Density (g.cm-3) A 1110 2606 9.1 B -266 -252 0.07 C 40 94 1.6 D -14 60 0.9       1.1 Which substance is a gas at room temperature? (1)   1.2 Which substance is a liquid at room temperature? (1)   1.3 Which substances are solids at room temperature? (1)   1.4 Which substance will be a liquid at -265°C? (1)   1.5 Which substances are gases at 70°C? (1)   1.6 Dry ice (solid CO2) is often used to cool ice-cream by bicycle driven ice-cream vendors. State the interconversion demonstrated when dry ice forms vapor. (1)   1.7 Explain the changes in particle arrangement that occur during the interconversion stated in 1.6. Explain how this arrangement change affects the properties of the respective states. (2)      

Evaluate the line integral \(\int_{C} {\bf F} \cdot {\bf dr} \), where \({\bf F}= x \ {\bf i} + z \ {\bf j} + x \ {\bf k}\) and \(C\) is given by \({\bf r}(t)=\langle 2t, t^{2}, 3 \rangle\) with \(0 \leq t \leq 1\).

5.1 What do you understand by the word “Globalisation”? (2)

10.6 The diagram shows an outline of part of the Periodic Table. Right-click on the button to open the data booklet in a new tab.   Which statement about elements X, Y and Z is not correct?   A All react with oxygen. B All conduct electricity. C All are metals. D All form coloured compounds.  

  QUESTION 9   This apparatus is used to electrolyse a concentrated solution of sodium chloride. Right-click on the button to open the data booklet in a new tab.   The ionic half-equations for the reactions at the electrodes are negative electrode 2H2O(l) + 2e−

6.2 Use the synoptic code to present the weather data in diagram 2 (4)      

  QUESTION 8   The pie chart shows the relative amounts of some gases in air. Right-click on the button to open the data booklet in a new tab.     8.1 Name of the gas that makes up most of the air. (1)   8.2 What is the approximate percentage of oxygen in air? (1)   Rain water is naturally slightly acidic because carbon dioxide dissolves in it. The word equation for the reaction that occurs is: carbon dioxide + water

Find the absolute maximum of the function \(f(x,y,z)=x^2-2y^2+z^2\) on the ellipsoid \(\frac{x^2}{4}+\frac{y^2}{9}+\frac{z^2}{25}=1\)

Compute the following integral \(\iint_{D} e^{-x^2-y^2}dA\), where \(D\) is the set \(D=\{ (x,y) |\quad 1\leq x^2+y^2 \leq 4, \quad x\geq 0,\quad y\geq 0 \}\)