True or false: after glassware is heated it

Chemistry

1 answer:

Vlad1618 [11]4 years ago

7 0

Answer:

True

Explanation:

Glasswares are glass-made substances that cannot be done without in the laboratory. They are used to hold and store chemicals, conduct chemical reactions etc. Common glasswares include conical flask, beakers, test tubes, volumetric flasks, pipette etc.

These glasswares are sometimes used to hold chemicals that needs to be heated, making the glasswares hot as well. Since they are made of glass materials, they are very fragile and must be handled carefully. One of the precautions when handling a glassware is that after hearing, they must be allowed to cool down slowly at room temperature in order to avoid breakage. Hence, the statement is TRUE.

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Describe the number of signals and their splitting in the 1H NMR spectrum of (CH3)2CHOCH3.

yanalaym [24]

Answer:

d. 3 signals: a singlet, a doublet, and a septet

Explanation:

In this case, we can start with the structure of $(CH_3)_2CHOCH_3$ . When we draw the molecule we will obtain 2-methoxypropane (see figure 1).

In 2-methoxypropane we will have three signals. The signal for the $CH_3$ groups in the left, the $CH$ and the $CH_3$ in the right. Lets analyse each one:

-) $CH_3$ in the right

In this carbon, we dont have any hydrogen as neighbors. Therfore we will have singlet signal in this carbon.

-) $CH$

In this case, we have 6 hydrogen neighbors ( the two methyl groups in the left). So, if we follow the n + 1 rule (where n is the amount of hydrogen neighbors):

$multiplicity~=~n+1~=~6~+~1~=~7$