Answer : Option D) .
Explanation : A delocalized π bond are those π bonds in which the electrons are allowed to move freely over more than two nuclei. So, amongst the given molecules is the correct answer. As is a molecule which shares a π bond between one carbon and three oxygen atom. The electrons move freely over the whole molecule.
- any zeroes between 2 non-zeroes
- any zeroes after non-zeroes in a number without a decimal point are sig figs
These are NOT:
- any zeroes before non-zeroes
- any zeroes after non-zeroes in a number without a decimal point
Answer:
Compounds are represented by chemical formulas. Elements in a compound are represented by chemical symbols, and the ratio of different elements is represented by subscripts.
Answer:
A- Solubility decrease.
B- Solubility increase.
C- No solubility change.
Explanation:
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In this case, since the solubility of salt stands for the maximum amount of salt that can be added to a specific mass of water, usually 100 g; we need to take into account that for table salt in aqueous solution, the higher the temperature the larger the solubility and the lower the temperature the smaller the solubility; it means that more salt is dissolved in the same mass of water at higher temperatures and vice versa. Therefore, A- would decrease the solubility as the solution is cooled down and B- would increase the solubility as the solution is heated up.
Moreover, since the mass of water is assumed to remain the same, adding more salt do not affect the solubility but increase the degree of saturation of the solution up to supersaturated, yet the solubility remains unchanged.
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Answer:
In order to determine the exact melting point of substance, it should be packed well in melting point tubes. If we don't pack properly, then its melting point will be low.
Reason:
Actually when you do not packed the substance well, then air pickets inside the solid will depress the melting point of your solid.
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