Here is the correct answer of the given question above about the crucible. The crucible and its contents gain mass when heated because <span>it contains a compound that forms a stable and solid oxide. Hope this is the answer that you are looking for. Have a nice day!</span>
<u><em>Answer:</em></u>
- Correct option is D. Family 18
<u><em>Explanation.</em></u>
The elements of group 18 of periodic table are called as noble gases. They are stable because they have complete valence shell electrons. So there octet rule is satisfied.
The elements of noble gases are
The endpoint in tiration is the point where an indicatior's halfway thru its color change. Equivalence point is where moles/stoichiometry of the system is satisfied (moles of reactants are equal to each other).
Titrating a strong acid with a strong base results in a salt that is neutral. Phenolphthalein changes color in the range <span>8.3 – 10. It is very easy to spot the change as it is colorless in acidic (< 8.3) and pink in basic (> 10).
pH will rapidly change near titration equivalence point. </span><span>Only one drop of the titrant
causes this large change, the color change of phenolphthalein does not
occur on the equivalence point, but IT IS within about 1 drop. <span>It would be considered an "acceptable uncertainty" in using titration
to determine concentration by volumetric measurement.</span></span>
Answer:
The sugar atoms formed new atoms after caramelization.
Explanation:
When sugar is heated to a certain temperature, it becomes caramel. Te formation of caramel from the sugar is a chemical process.
In the context, Pedro is doing an investigation by heating sugar to make caramel. Burning of the sugar crystal is a chemical change as different chemicals are present in both. The caramel formed cannot be revered back to sugar crystal, this also proves the chemical change of caramelization of sugar cubes. Sugar consists of carbon, oxygen and hydrogen atoms. It reacts with atmospheric oxygen atoms to form new groups of atoms and forms caramel.
