10.7 The halogens are elements in Group 7 of the Periodic Table. Chlorine gas is   A  brown B colourless C  green D violet [1]

10.3 Which two molecules contain the same amount of electrons?   A Cl2 and SO­­2 B CH4 and H2O C CO and NH3 D CO2 and HCl   [1]

  QUESTION  5   The following question refer to sodium chloride, a chemical commonly found in most households.   5.1 Is sodium chloride a mixture or a pure substance? (1)   5.2 What bond is found in sodium chloride? (1)   5.3 What structure does sodium chloride have? (1)   5.4 Draw the dot and cross diagram of only the outer energy shell for sodium chloride (2)   5.5 Explain why sodium chloride conducts electricity when molten. (1)       [6]

10.1 Which diagram illustrates diffusion? [1] Right-click on the button to open the data booklet in a new tab.  

10.2 Element Y has 10 protons. Element Z has 11 protons. Which statement is correct?   A  Element Z has one more outer electron shell than element Y. B  Element Y is in the same group as element Z. C  Element Z is in the same period as element Y. D  Element Z has the same amount of electrons as element Y. [1]

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)       [8]

5.1 What do you understand by the word “Globalisation”? (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 \(0 \leq t \leq 1\).

  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−