Answer:
You can get 7 answers wrong.
Explanation:
Let's calculate the average
![\frac{15}{2} \\\\=7.5](https://tex.z-dn.net/?f=%5Cfrac%7B15%7D%7B2%7D%20%5C%5C%5C%5C%3D7.5)
So if you correctly answer 8 -15 (7.5 is approximated to 8 )questions correctly you will pass.
So you can get 7 answers wrong.
Answer: It is preferable to add excess bromobenzene instead of excess acetophenone because the reaction is exothermic and the addition of too much acetophenone causes the temperature to rise rapidly which may lead to an explosion.
Explanation:
The preparation of 1,1- diphenyl ethanol by reaction between bromobenzene and acetophenone is known as Grignard reaction.
The mechanism of this reaction is given in the adjoining image.
In this reaction, acetophenone is added slowly and in small amounts because this reaction is exothermic.
If a large quantity of acetophenone is added simultaneously, it can lead to the temperature rising too much in a short duration of time and may cause an explosion which may injure the person performing this reaction.
Also, too much acetophenone becomes an impurity which further hampers the reaction.
Therefore, it is preferable to add excess bromobenzene instead of excess acetophenone.
To know more about "Grignard Reaction", refer to the following link:
brainly.com/question/17135014?referrer=searchResults
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Answer:
The energy will be flowing from hot coffee to ice cube. The energy flow will stop when both temperatures of coffee and ice cube will become equal.
Explanation:
The second law of thermodynamics deals with the direction in which spontaneous processes go. Many processes run spontaneously in one direction, that is, they are irreversible under certain conditions. Although irreversibility is seen in everyday life, for example, a broken glass does not return to its original state, complete irreversibility is a statistical statement that cannot be seen during the life of the universe. More specifically, an irreversible process is a process that depends on the route. If the process can only go in one direction, the reverse path is fundamentally different and the process can't be reversible. For example, heat always involves the transfer of energy from a higher temperature to a lower temperature. A cold object that comes in contact with a hot object never cools, transfers heat to the hot object, and heats it up.
Well uncontrolled cell division can lead to cancer.