Which of the following is not an example of temperature abuse ?
2 answers:
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Response:
This is my understanding.
Explanation:
(g) Titration curves
While I can't create two curves on a single graph, I can depict them separately for clarity.
In part (d), the graph indicated an equivalence point at 20 mL.
For the second titration, since the NaOH concentration is doubled, the volume to reach the equivalence point will be halved — 10 mL.
Below are the two titration curves.
(h) Evidence of reaction
Both HCl and NaOH are colorless solutions.
There is no gas released or precipitate formed during their reaction.
It’s likely the student observed that the Erlenmeyer flask heated up, indicating a chemical change.
Answer: The correct option is 3.
Explanation: Radioisotopes that emit alpha-particles are termed alpha-emitters. These isotopes undergo alpha-decay.
Those radioisotopes that emit beta-particles are called beta-emitters. They undergo beta-minus decay, in which a neutron converts to a proton and an electron.
Isotopes that emit positrons are known as positron-emitters, undergoing beta-plus decay where a proton becomes a neutron.
From the options given,
Option 1: All three isotopes undergo beta-minus decay.
Option 2: Cs-137 and Tc-99 undergo beta-minus decay.
Fr-220 undergoes alpha-decay.
Option 3: Kr-85 undergoes beta-minus decay.
Ne-19 undergoes positron decay.
Rn-222 undergoes alpha decay.
Option 4: All three isotopes undergo beta-minus decay processes.
Therefore, the correct choice is 3.