1.40 Four different food colourings are analysed using chromatography. The results are shown on the chromatogram. The diagram is not drawn to scale. Which food colouring contains a component with an Rf value of 0.3?   Right-click on the button to open the data booklet in a new tab.       

1.7 The diagram shows an image of a diamond and graphite in no particular order.   Right-click on the button to open the data booklet in a new tab.        What is true for the uses of P and Q based on their structures?

1.6 The electronic structures of atoms P and Q are shown.   Right-click on the button to open the data booklet in a new tab.        P and Q react to for an ionic compound. What is the formula of the compound?   Right-click on the button to open the data booklet in a new tab.       

1.4 Which atom has twice as many neutrons as protons?   Right-click on the button to open the data booklet in a new tab.       

1.22 Water for human use is treated by filtration then chlorination. Which uses do not need water of this quality?   1 water for cooling in industry 2 water for flushing toilets in the home 3 water for drinking

1.21 A metal has the following properties.   ● It does not react with cold water. ● It reacts with dilute hydrochloric acid. ● It cannot be extracted from its oxide using carbon. Between which two metals in the reactivity series should it be placed?

1.12 An aqueous solution of copper (II) sulphate was made by adding excess copper (II) oxide to dilute sulphuric acid. The mixture was heated, stirred, and then filtered.   Right-click on the button to open the data booklet in a new tab.        What was the pH of the acid before adding the copper (II) oxide and of the solution after filtration?     pH of acid before adding copper (II) oxide pH of solution after filtration A greater than 7 7 B greater than 7 less than 7 C less than 7 7 D less than 7 greater than 7

1.2 Which method will be most suitable for the separation of sand and oil?

The DASH diet plan was devised to prevent  

The feeling of satisfaction resulting from consumption of a meal is termed