3 years ago

Relative dating methods help scientists to _____.

Chemistry

2 answers:

klasskru [66]3 years ago

8 0

identify the order in which rock units formed

gogolik [260]3 years ago

6 0

identify the order in which they formed

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Name the following species: (a) BrO-, (b) (HSO4)-, and (c) (C2O4)-2

Rainbow [258]

Answer:

a)barium oxide

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c) oxalate

5 0

3 years ago

Please help me with this. And show all work as well ASAP!!

qaws [65]

Answer: The partial pressure of oxygen is 187 torr.

Explanation:

According to Raoult's law, the partial pressure of a component at a given temperature is equal to the mole fraction of that component multiplied by the total pressure.

$p_1=x_1p_{total}$

where, x = mole fraction

$p_{total}$ = total pressure

$x_{oxygen}=\frac{\text {moles of oxygen}}{\text {total moles}}$ ,

$x_{oxygen}=\frac{3.0}{12.33}=0.243$ ,

$p_{oxygen}=0.243\times 770torr=187torr$

Thus the partial pressure of oxygen is 187 torr.

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3 years ago

A sample of a substance was determined and contained 1.0g of mg and 1.75g of o. what is the empirical formula? (10 pts)

Juliette [100K]

Total mass = 2.75g Mass % of Mg = 1.0g x 100/2.75g = 36.36 % Mass % of O = 1.75g x 100/2.75g = 63.64 % Mol of Mg = 36.36/24 = 1.515 Mol of O = 63.64/16 = 3.977 Ratio of Mol of Mg and O in the substance = (1.515 : 3.977) x 2 = 3 : 8 The empirical formula of substance is Mg3O8

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4 years ago

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In a neutral atom, the number of protons _______ the number of electrons.

sergejj [24]

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equal the number of electrons.