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3 years ago

How many neutrons does X have if it’s atomic number is 28 and it’s mass number is 71

1 answer:

8 0

We know that the mass number is equal to the number of protons plus the number of neutrons. We also know that the atomic number is the same number as the number of protons. Therefore, we can solve for the number of neutrons with what we were given:

x + 28 = 71
x=43

There are 43 neutrons

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An atom does not have to have equal numbers of protons and _________________ in the nucleus.

Tom [10]

Answer:

the answer is neurtons

Explanation:

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3 years ago

Nicotine is an addictive substance found in tobacco. Identify the hybridization state and geometry of each of the nitrogen atoms

Marina CMI [18]

The structure of nicotine is as follows:

In the aromatic ring, nitrogen atom has two bonds and one lone pair therefore, hybridization will be $sp^{2}$ . In five-membered ring , nitrogen has two bonds and 1 lone pair therefore, hybridization will be $sp^{3}$ .

Therefore, hybridization state of $N^{1}$ and $N^{2}$ (as in the attached structure) is $sp^{2}$ and $sp^{3}$ respectively.

Now, according to VESPR theory for $sp^{2}$ hybridization with one lone pair the geometry is bent and for $sp^{3}$ hybridization with one lone pair the geometry is pyramidal.

Therefore, geometry of $N^{1}$ and $N^{2}$ (as in the attached structure) is bent and pyramidal respectively.

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3 years ago

PLEASE ANSWER MY QUESTION 17 POINTS

Margaret [11]

Left Panel

A: Not correct. One reactant is dissolved in water. The other is a solid that combines with the one reactant that is in water. That's what aqueous (aq) means.

B: CuCl2 is aqueous (the equation says so) ClCl2(aq) means that the copper chloride is in water. Whatever else B says, this much is true so that Statement B is false.

C: False. The reactants contain a liquid and a solid.

D: True. The statement is true because CuCO3 is labels as a solid(s), and CO2 is labeled as a gas (g).

E: is false. Where is the solid in the products?

Right Panel

Sample Mass: 33.5 grams

Volume: 3.2 cm^3

Density = mass / volume

Density = 33.5 / 3.2 = 10.47.

It can only be silver.

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3 years ago

Read 2 more answers

How to overcome overshot in tritation

spayn [35]

Answer:

The method involves students exhaling air using a plastic straw into the over-titrated acid-base mixture, which turned pink-colored with phenolphthalein indicator.

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3 years ago

Which description is not a property of a base? (2 points)

LuckyWell [14K]

It is answer A: Bitter taste

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3 years ago