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  1. W

    how was chemistry p21?????!!!

    I THINK THE thresholds (minimum marks) for Grades A WILL 45
  2. W

    how was chemistry p21?????!!!

    THEY SAID OTHER THAN THAT ACID
  3. W

    how was chemistry p21?????!!!

    I DONT SEEN TO REMEMBER THAT IT WAS THIS WAY ALTHOUGH I THINK THEY ASK WRITE CAUSE FOR EACH OXIDE SOMETHING SO HOW CAN BE H2O DANGEROUS
  4. W

    how was chemistry p21?????!!!

    WHAT WAS THE ANSWER FOR OUTLINE HOW CRACKING TAKE PLACE ... I WROTE HIGHER TEMPERATURE ,PRESSURE AND USING CATALYST............ WAS IT RIGHT
  5. W

    how was chemistry p21?????!!!

    I WROTE THAT WHITE SOLID FORMS FOR CA(OH)2 FOR BOTH OF THEM ... AND FOR THE SULPHURIC ACID ONE I WROTE H2SO3(SULPHUROUS ACID)
  6. W

    how was chemistry p21?????!!!

    libra94 WHAT WAS THE ANSWER FOR THE OBSERVATION FOR CAL(OH)2 FOR CALCIUM AND CALICIUM OXIDE SOMETHING
  7. W

    how was chemistry p21?????!!!

    HOW MANY MARK WAS THE EQUATION FOR libra94
  8. W

    how was chemistry p21?????!!!

    ibrahimovais HOW IT WAS +226KJMOL-1.
  9. W

    how was chemistry p21?????!!!

    HEY I REMEMBER THAT THEY TOLD TO WRITE ABOUT 3 OXIDE CAUSING POLLUTION .FUTHERMORE IT WAS 3 MARKS libra94
  10. W

    how was chemistry p21?????!!!

    I AM NOT SURE WHAT DID U WRITE
  11. W

    how was chemistry p21?????!!!

    what was the equation for the C2H5SH +O2 ---> S02 + CO + CO2 WAS IT I DIDNT TAKE WATER SINCE WHAT COULD HAVE BEEN THE CAUSE OF POLLUTION FOR H20 --- libra94
  12. W

    how was chemistry p21?????!!!

    I THINK IT WAS DILUTE H2SO4 AND CONIDITION HEAT UNDER REFLUX WAS IT RIGHT libra94 .WHAT DID U WRITE :oops:
  13. W

    how was chemistry p21?????!!!

    what was the answer for last question the one with 6 marks i got +60 kjmol-1 .however many of my of friend got something +225 what was the answer. the way i did was as is to find the enthapy of formation......... :) 2H2 + 2C --> C2H2 Product - reactants s0 (-1300)-(2(-288) + 2(392)) = +60kjmol-1
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