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3 years ago

Need help with this question

Chemistry

2 answers:

Goryan [66]3 years ago

8 0

Why it sideways doe

Liula [17]3 years ago

3 0

Answer:

I think it's c

Explanation:

I hope this helps :)

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Among these element groups, which is least likely to form ions?

cupoosta [38]

Your answer would be 7A

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How are elements usually found

riadik2000 [5.3K]

The answer is A cause gas clouds hold elements in it

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An unknown compound contains 38.7 % calcium, 19.9 % phosphorus and 41.2 % oxygen. what is the empirical formula of this compound

Softa [21]

Answer: Ca3(PO4)2

Explanation:

We assume that the sample is 100.0 g.

The sample contains 38.7 g of Ca, 19.9 g of P, and 41.2 g of O as the proportions show.

Then we can calculate the number of moles of each component (n = m/atomic mass).

The number of moles of Ca = 38.7/40.078 = 0.96 mol.

The number of moles of P = 19.9/30.97 = 0.64 mol.

The number of moles of O = 41.2/15.99 = 2.75 mol.

Now, we can get the molar ratios of different components (Ca, P, and O) in the sample by dividing the number of moles of each component by the lower number of moles, that we should divide the number of moles by (0.64).

Ca: P: O = (0.96/0.64) : (0.64/0.64) : (2.75/0.64) = 1.5 : 1 : 4.

To avoid the fraction of the ratios, we can multiply all ratios by 2.0.

Now, the ratio of Ca : P : O will be 3 : 2 : 8.

That main the empirical formula of the compound is Ca3P2O8 which can be expressed as calcium phosphate (Ca3(PO4)2).

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3 years ago

Help neeeeeeeeeeeeeeededdddddddd badddd..

Hitman42 [59]

I think the awnser would be C. becuase Pure Substances are made of mostly the same material and properties Such as: Nitrogen Gas, Oxygen Gas, Carbon, Iorn, Water, Sugar and Salt.

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3 years ago

Choose all the answers that apply. Ethical scientists _____.

charle [14.2K]

These would be your answers!

(taken from a source)

Follow the scientific method

Keep detailed records

Communicate experimental results
Hope that helped!

:)

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