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Free waec chemistry (obj and theory) 2017 expo

an acid base indicator is a weak acid or weak base that exhibits a colour change as the concentration of hydrogen (H^+) or hydroxide (H^-) ions changes in an aqueous solution
i)oxidizing agent
ii)mixed anhydride
enthalpy of combustion is the heat evolved when one mole of a substance is completely burns in oxygen gas under standard conditions
enthapy of combustion is always negetive since it involvs a rise in temperature and heat of reactants is greater than the heat of products
primary cell is a cell that cannot be re charged while secondary cell is a cell that can be recharged

2ai)ii The periodic table arranges the elementsby periodic properties, which are recurring trends in physical and chemicalcharacteristics. ... These trends explainthe periodicity observed in the elementalproperties of atomic radius, ionization energy, electron affinity, and electronegativity.
2aii) Electron affinity
Ionization energy

Electron affinity reflects the ability of an atom to accept an electron. It is the energy change that occurs when an electron is added to a gaseous atom.

Ionization energy:

Ionization energy is the energy required to remove an electron from a gaseous atom or ion. The first or initial ionization energy or Ei of an atom or molecule is the energy required to remove one mole of electrons from one mole of isolated gaseous atoms or ions.


Electronegativity is a measure of the attraction of an atom for the electrons in a chemical bond. The higher the electronegativity of an atom, the greater its attraction for bonding electrons.

Thermal cracking
(I) H H. H
| | |
| | | |
(II) H H
| |
| | | |
I-normal butene
II -But-2-ene
C4H8 +H2 -------> C4H10
- rub the fat on a blank white paper
- pour Sudan (III) dye over the paper
-wash the paper under tap
- rubbing the fat on the paper produces a translucent color
-pouring sudan (III) will stain the blot red
- fat is present because sudan (III) can stain fat red


5ai) worm the unknown substance with concentrated H2SO4 in a test tube. if trioxonitrate(v) ion's are/is present, some trioxonitrate(v) acid will be condensed as oily drops on the upper part of the tube. On further heating, the acid decomposes yielding brown fums of NO2 gas.

5iia) Sodium chloride is used for:
=preserving food
=glazing pottery

5iib) Sodium trioxocarbonate(iv) is used for:
=standardizing acids in the laboratory
=the manufacture of glass

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