1.38  River water contains soluble impurities, insoluble impurities, and bacteria. River water is made safe to drink by filtration and chlorination. Which statement is correct? (1)

 1.16 Elements X, Y and Z are in Group 7 of the Periodic Table.   X is a gas. Y is less reactive than Z. Z is a red liquid. When X, Y and Z are put in order of increasing proton number, which order is correct?   (1)  

_______is the amount of myocardial stretch at the end of diastole. This is also the amount of volume in the ventricle.

What scale and sweep/paper speed is LV edp measured?

1.23 Carbon monoxide is an air pollutant produced when petrol is burned in a car engine. Why is carbon monoxide considered to be an air pollutant? (1)

  QUESTION 2     This question is about ions and ionic compounds.   2.1   Choose from the following list of ions to answer the questions.   Br-          Ca2+               Cl –                  Cr 3+               Cu 2+ K +                Li +               Na+                 SO32-           SO42-     Each ion may be used once, more than once or not at all. State which ion:     a gives a lilac colour in a flame test. [1]   b forms a grey-green precipitate with aqueous ammonia. [1]   c forms a white precipitate with aqueous sodium hydroxide. [1]   d forms a cream precipitate with acidified aqueous silver nitrate. [1]   e forms a white precipitate with acidified aqueous barium nitrate. [1] 2.2   Describe how to do a flame test on a sample of a salt. [2] 2.3   Magnesium phosphate contains magnesium ions, Mg2+ , and phosphate ions, PO43- . Deduce the formula of magnesium phosphate. [1]       [8]  

 1.25 A student is asked to measure the time taken for 0.4 g of magnesium carbonate to react completely with 25.0 cm3 of dilute hydrochloric acid. Which pieces of apparatus does the student need?   (1)

1.1 Which diagram illustrates diffusion? (1)     Right-click on the button to open the data booklet in a new tab.       

1.8 The diagram shows an unsuccessful experiment to nickel plate a pan. What change is necessary to nickel plate the pan?   (1)   Right-click on the button to open the data booklet in a new tab.    

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. (1)   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