12. Experimental techniques and chemical analysis
A section of Chemistry, 0620
Listing 10 of 677 questions
The table shows the masses of some ions in a 1000 cm3 sample of toothpaste. name of ion formula of ion mass of ion in 1000 cm3 of toothpaste / g NH4 + 0.2 calcium Ca2+ 1.2 Cl – 0.9 fluoride F– 1.4 magnesium Mg2+ 2.0 phosphate PO4 3– 24.4 sodium Na+ 28.1 sulfate SO4 2– 9.2 tin(Sn2+ 0.2 zinc Zn2+ 0.1 Answer these questions using only the information in the table. State which negative ion has the lowest mass in 1000 cm3 of toothpaste. Name the compound that contains NH4 + and Cl – ions. Calculate the mass of phosphate ions in 250 cm3 of toothpaste.  mass = g Describe a test for sulfate ions. test observations  Toothpaste also contains cinnamal. The structure of cinnamal is shown. C C C H C C C C H H H H H H C C O H Deduce the formula of cinnamal to show the number of atoms of carbon, hydrogen and oxygen. Cinnamal can be oxidised to a carboxylic acid. Draw the structure of a carboxylic acid functional group to show all of the atoms and all of the bonds.  Ethanoic acid is a carboxylic acid. Ethanoic acid reacts like a typical acid. Complete the word equation for the reaction of ethanoic acid with sodium carbonate. ethanoic acid + sodium carbonate sodium ethanoate + +  
0620_s22_qp_31
THEORY
2022
Paper 3, Variant 1
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The table shows the masses of some ions in a 1000 cm3 sample of toothpaste. name of ion formula of ion mass of ion in 1000 cm3 of toothpaste / g ammonium NH4 + 0.5 calcium Ca2+ 3.6 carbonate CO3 2– 2.5 chloride Cl – 0.9 fluoride F– 1.2 Mg2+ 0.2 phosphate PO4 3– 28.0 sodium Na+ 32.0 SO4 2– 10.4 tin(Sn2+ 0.3 Answer these questions using only the information in the table. State which positive ion has the lowest mass in 1000 cm3 of toothpaste. Name the compound that contains Mg2+ and SO4 2– ions. Calculate the mass of sodium ions in 200 cm3 of toothpaste.  mass = g Describe a test for chloride ions. test observations  Toothpaste also contains glycerol. The structure of glycerol is shown. H C H H O H H C O H H C O H Deduce the formula of glycerol to show the number of atoms of carbon, hydrogen and oxygen. Glycerol is an alcohol. Ethanol is also an alcohol. Draw the structure of ethanol to show all of the atoms and all of the bonds.  Name the two products formed when ethanol undergoes complete combustion. and ��������������������������������������������������������������� Give one use of ethanol. 
0620_s22_qp_32
THEORY
2022
Paper 3, Variant 2
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The table shows the masses of some ions in a 1000 cm3 sample of toothpaste. name of ion formula of ion mass of ion in 1000 cm3 of toothpaste / g NH4 + 0.2 calcium Ca2+ 0.8 CO3 2– 0.7 chloride Cl – 0.9 fluoride F– 2.2 magnesium Mg2+ 2.0 phosphate PO4 3– 24.4 sodium Na+ 34.2 sulfate SO4 2– 10.1 tin(Sn2+ 0.4 zinc Zn2+ 0.1 Answer these questions using only the information in the table. State which negative ion has the highest mass in 1000 cm3 of toothpaste. Name the compound that contains NH4 + and CO3 2– ions. Calculate the mass of fluoride ions in 250 cm3 of toothpaste.  mass = g Describe the observations when aqueous ammonia is added drop by drop to a solution containing zinc ions until the ammonia is in excess. observations with a few drops of ammonia observations with ammonia in excess  Toothpaste also contains compound A. The structure of compound A is shown. H C H H H H C O H H C O H Deduce the formula of compoundA to show the number of atoms of carbon, hydrogen and oxygen. CompoundA is an alcohol. EthanoI, C2H5OH, is also an alcohol. Complete these sentences about ethanol using words from the list. different formula group identical molecule similar Ethanol is part of the alcohol homologous series. Each member of the alcohol homologous series has the same functional . Members of the same homologous series have chemical properties that are .  When ethanol undergoes incomplete combustion, a small amount of carbondioxide is produced. Name two other substances that are produced when ethanol undergoes incomplete combustion. and ��������������������������������������������������������������� 
0620_s22_qp_33
THEORY
2022
Paper 3, Variant 3
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