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3 years ago

An atom of nitrogen has several protons in its nucleus. How many electrons does it have

Chemistry

1 answer:

Semenov [28]3 years ago

4 0

It has 7 electrons, 7 protons and 7 neutrons

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An engineer that designs buildings is a (n)

guapka [62]

An architectural engineer.

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3 years ago

A solution is prepared by mixing 25.0 g H2O and 25.0 g C2H5OH. Determine the mole fractions of each substance.

Veronika [31]

Answer:

Mole fraction H₂O → 0.72

Mole fraction C₂H₅OH → 0.28

Explanation:

By the mass of the two elements in the solution, we determine the moles of each:

25 g . 1 mol/ 18g = 1.39 moles of water (solute)

25 g . 1 mol / 46 g = 0.543 moles of ethanol (solvent)

Mole fraction solute = Moles of solute / Total moles

Mole fraction solvent = Moles of solvent / Total moles

Total moles = Moles of solute + Moles of solvent

1.39 moles of solute + 0.543 moles of solvent = 1.933 moles → Total moles

Mole fraction H₂O = 1.39 / 1.933 → 0.72

Mole fraction C₂H₅OH= 0.543 / 1.933 → 0.28

Remember that sum of mole fractions = 1

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2 years ago

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How do chemists express the rates of chemical reactions

Inessa [10]

Answer:

They expressed it as rate of change in concentration of reactants or products in a chemical reaction

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3 years ago

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Baking soda and vinegar can be used to model a volcanic eruption in a science demonstration because they bubble violently when m

julia-pushkina [17]

Vinegar and baking soda react to form a new gaseous substance.

The reaction between Vinegar and baking soda has been one of the most common examples of Chemical Reaction.

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2 years ago

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Draw the most stable resonance structure for the intermediate in the electrophilic aromatic bromination of aniline, anisole, and

ASHA 777 [7]

Answer:

Here's what I get

Explanation:

(a) Intermediates

The three structures below represent one contributor to the resonance-stabilized intermediate, in which the lone pair electrons on the heteroatom are participating (the + charge on the heteroatoms do not show up very well).

(b) Relative Stabilities

The relative stabilities decrease in the order shown.

N is more basic than O, so NH₂ is the best electron donating group (EDG) and will best stabilize the positive charge in the ring. However, the lone pair electrons on the N in acetanilide are also involved in resonance with the carbonyl group, so they are not as available for stabilization of the ring.

(c) Relative reactivities

The relative reactivities would be

C₆H₅-NH₂ > C₆H₅-OCH₃ > C₆H₅-NHCOCH₃

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2 years ago