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Identify the waveform as depicted in the image below.  

 1.28 During the electrolysis of concentrated hydrochloric acid, gases are produced at both electrodes. Which statement describes the test result for the gas collected at the negative electrode?   (1)

 1.27 An isotope of chromium has an atomic mass of 52g.mol-1 . Which statement about an atom of this isotope of chromium is correct? (1)

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)

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

 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)  

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)

 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)

  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]