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3 years ago

Why can we characteristic properties of a substance to identify it

1 answer:

3 0

We can characterize properties of a substance to identify it because it helps us determine how the substance should be used. We can identify a substance by using physical or chemical properties. These help us by telling us which chemical we are looking at.

I hope this helps.. I wasn't sure what kind of answer you were looking for.

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If the energy difference between two electronic states is 214.68 kJ / mol , calculate the frequency of light emitted when an ele

atroni [7]

${\qquad\qquad\huge\underline{{\sf Answer}}}$

Here we go ~

Energy difference btween the two electronic states can be expressed as :

${ \qquad \sf \dashrightarrow \: \Delta E = h\nu}$

[ h = planks constant, ${\: \nu }$ = frequency ]

$\qquad \sf \dashrightarrow \:214.68 = 39.79 \times 10 {}^{ - 14} \times \nu$

$\qquad \sf \dashrightarrow \: \nu = \cfrac{214.68}{39.79 \times 10 {}^{ - 4} }$

$\qquad \sf \dashrightarrow \: \nu = \cfrac{214.68}{39.79 } \times 10 {}^{14}$

$\qquad \sf \dashrightarrow \: \nu \approx 5.395 \times10 {}^{14} \:\:hertz$

5 0

2 years ago

A rock has a mass of 127 grams and displaces 32.1 mL of water. what is the density of the rock?

anzhelika [568]

Answer:

3.96 g/cm^3

Explanation:

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3 years ago

Two aqueous solutions are both at room temperature and are then mixed in a coffee cup calorimeter. The reaction causes the tempe

sergiy2304 [10]

Answer:

E. None of the above statements are true.

Explanation:

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3 years ago

Can someone help with this pls!!

patriot [66]

Answer:

Explanation:

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8 0

2 years ago

Predict the organic product formed when phosgene reacts with an excess of methanol.

gulaghasi [49]

When phosgene is reacted with an excess of methanol, this produces dimethyl carbonate. Dimethyl carbonate is used in methylating anilines, phenols, and carboxylic acids, and is also being studied for its use as an alternative additive in fuel.

The industrial production of dimethyl carbonate no longer uses phosgene because of the latter's toxicity. Phosgene widely gained infamy when it was used in chemical warfare during WWI.

7 0

4 years ago