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IB CHEMISTRY EXAM LATEST UPDATE 2024/2025 QUESTIONS AND ANSWERS GRADED A+
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IB CHEMISTRY EXAM LATEST UPDATE2024/2025 QUESTIONS AND ANSWERS
GRADED A+
Area:
Science and technology
Outline the rxn between acids + reactive metals, metal oxides,
metal hydroxides, hydrogen carbonates, and carbonates -
,✔✔ANSWER✔✔-1. Acid + Metal = Salt + Hydrogen gas (reactive
metal - this is reason for corrosion)
2. Acid + Metal hydroxide = Salt + Water (neutralization - exo)
3. Ammonia + Acid = Salt (neutralization - exo)
4.Acid + Metal oxide = Salt + Water (neutralization - exo)
5.Acid + Carbonate = Salt + Water + Carbon
dioxide
6. Acid + Hydrogen carbonate = Salt + Water +
Carbon dioxide
Isotopes - ✔✔ANSWER✔✔-Atoms of same element with same
number of protons, different number of neutrons
Mass Spectrometer - ✔✔ANSWER✔✔-Used to determine
relative atomic mass
,Vaporization -> Ionization -> Acceleration -> Deflection
Amount of deflection depends on mass and charge (smaller the
mass, higher the charge -> greater deflection)
mass/charge ratio recorded, measures mass and the relative
amount of all ions present
Use of radioactive isotope Carbon - ✔✔ANSWER✔✔-C-14
Carbon dating
Use of radioactive isotope of Cobalt - ✔✔ANSWER✔✔-Co-60
Radiotherapy
Use of radioactive isotopes of Iodine - ✔✔ANSWER✔✔-I-131
and I-125
used as tracers in medicine for treating and diagnosing illnesses
Afbau principle - ✔✔ANSWER✔✔-orbitals with lowest energy
are filled first
, Hund's rule - ✔✔ANSWER✔✔-orbitals filled within the same
subshell are filled singly first
First Ionization Energy - ✔✔ANSWER✔✔-The energy required
to remove one electron from an atom in its gaseous state.
(kJ/mol)
X(g) -> X+(g) + e-
Transition Element - ✔✔ANSWER✔✔-an element that
possesses and incomplete d sub level in one or more of its
oxidation states
have variable oxidation states, form complex ligands, have
colored compounds, display catalytic and magnetic properties
Catalyst - ✔✔ANSWER✔✔-increase the rate of a chemical
reaction by providing a different reaction pathway and reducing
the activation energy
Catalyst: Platinum and Palladium (Pt and Pd) - ✔✔ANSWER✔✔-
catalytic converters in cars
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