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svetlana [45]
3 years ago
5

Describe how NH3 and CF4 satisfies the octet for all atoms.

Chemistry
1 answer:
MariettaO [177]3 years ago
4 0
Let's start with ammonia (NH3)
A nitrogen atom has five valence electrons, and it wants a total of eight. It bonds with three hydrogen atoms, and "shares" one of its electrons with each hydrogen atom. The nitrogen atom now has six shared electrons and two unshared electrons, meaning the nitrogen atom now has eight. Hydrogen, on the other hand is special, as it only really wants two electrons in its outer shell, so it has a total of 2 shared electrons, and the octet or "Noble gas" rule is fulfilled, as hydrogen would then be like the nearest noble gas, helium.

For CF4, the explanation is much more simple. Each fluorine has seven outer electrons, so it wants to gain one more. Carbon has four electrons, and it wants to gain four. So, carbon shares one of each of its electrons with one of each fluorine's, making the carbon have eight electrons, and each fluorine has eight as well.
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A student collected the data shown in the table below during an experiment.
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Answer:

An alcohol thermometer can measure the freezing point of a liquid that freezes at −80 °C.

Explanation:

A thermometer is a device used to measure temperature. A thermometer must contain a thermometric substance. A thermometric substance is any substance having a particular physical property that changes with temperature.

For all liquid-in-glass thermometers, the property that changes with change in temperature is the height of the liquid. There are two kinds of liquid-in-glass thermometers; mercury-in-glass thermometer and alcohol-in-glass thermometer.

Alcohol-in-glass thermometer measures very low temperatures up to as low as -115°C. If it measures such a low temperature, then it can efficiently measure -80°C hence the answer.

Alcohol-in-glass thermometers have a narrower temperature range than mercury-in-glass thermometer. The later is well adapter for the measurement bof higher tempetures up to 357°C.

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3 years ago
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mrs_skeptik [129]

Answer:

a

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<u>Explanation:</u>

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How many pili are in a bacterial cell
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Hope it helps you

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