3 years ago

The element oxygen, represented by the symbol O, is classified as

Chemistry

1 answer:

Alenkinab [10]3 years ago

7 0

Answer:

C. A pure substance

Explanation:

Oxygen is an element which cannot be broken down into simpler terms causing it to be a pure substance

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Write the two half-equations for the following redox reaction 2H+ +2Br- +H2SO4= Br2 + SO2 +2H2O

Oduvanchick [21]

Explanation:

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3 years ago

Identify each of the following sets of quantum numbers as allowed or not allowed in the hydrogen atom.

Westkost [7]

Answer:

See explanation.

Explanation:

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In this case, according to the given information, it turns out possible for us to firstly recall the electron configuration of hydrogen:

$1s^1$

To realize that the principal quantum number is 1, the angular is 0 as well as the magnetic one; therefore we infer that all the given n's are not allowed, just l=0 is allowed as well as ml=0 yet the rest, are not allowed.

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3 years ago

PLEASE HELP!!! How many grams are in 10.11 moles of sucrose?

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3 years ago

How many moles of HNO3 are present if 4.90×10−2 mol of Ba(OH)2 was needed to neutralize the acid solution?

Amiraneli [1.4K]

Answer:

0.098 moles

Explanation:

Let y represent the number of moles present

1 mole of Ba(OH)₂ contains 2 moles of OH- ions.

Hence, 0.049 moles of Ba(OH)2 contains y moles of OH- ions.

To get the y moles, we then do cross multiplication

1 mole * y mole = 2 moles * 0.049 mole

y mole = 2 * 0.049 / 1

y mole = 0.098 moles of OH- ions.

1 mole of OH- can neutralize 1 mole of H+

Therefore, 0.098 moles of HNO₃ are present.

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How many neutron and protons are in lithium-7?

ikadub [295]

So it contains three protons and four neutrons

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