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3 years ago

What is true about: Na+1?

Chemistry

1 answer:

AlexFokin [52]3 years ago

6 0

Hey there!

Na is sodium, which has 11 protons.

The more realistic amount of neutrons for this atom to have is 12. 23 would be the sum of protons and electrons.

The atom has a charge of 1+, so there is one less electron than protons, so

11 - 1 = 10 electrons.

Your answer is d. it has 11 protons, 10 electrons, and 12 neutrons.

Hope this helps!

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Rank the formation of the solutions A, B, and C from the most exothermic to the most endothermic. Rank the enthalpy of solution

Elodia [21]

This is an incomplete question, the table is attached below.

Answer : The correct ranking of the solution from most exothermic to most endothermic will be: A, B and C.

Explanation :

As we know that the intermolecular force of attraction play an important role in the interaction of solute-solute, solute-solvent and solvent solvent solution.

In the solution A, the solute-solute and solvent-solvent interactions are weak. So, their solute-solvent interaction will be strong. That means, the solution will be more exothermic.

In the solution C, the solute-solute and solvent-solvent interactions are strong. So, their solute-solvent interaction will be weak. That means, the solution will be more endothermic.

Thus, the correct ranking of the solution from most exothermic to most endothermic will be: A, B and C.

4 0

4 years ago

Thulium-167 has a half life of 9.0 days. If the initial amount of thulium is 50.0 grams. How many grams are left after 36.0 days

BARSIC [14]

Answer:

3.125 grams.

Explanation:

It is known that the decay of a radioactive isotope isotope obeys first order kinetics.

Half-life time is the time needed for the reactants to be in its half concentration.

If reactant has initial concentration [A₀], after half-life time its concentration will be ([A₀]/2).

Also, it is clear that in first order decay the half-life time is independent of the initial concentration.

∵ Thulium-167 has a half life of 9.0 days.

∴ The time is needed to calculate the grams are left after (36.0 days) represents (36.0 days / 9.0 days) = 4.0 half-lives.

50.0 grams → (first half life) 25.0 grams → (second half life) 12.5 grams → (third half life) 6.25 grams → (fourth half life) 3.125 grams.

So, the grams are left after 36.0 days = 3.125 grams.

3 0

3 years ago

Liquid sodium is being considered as an engine coolant. How many grams of liquid sodium (minimum) are needed to absorb of energy

Ivenika [448]

Answer:

See explanation below

Explanation:

First, you are not providing any data to solve this, so I'm gonna use some that i made up to explain to you, how to solve it. Then, you can go and replace the data you have with the procedure here

The concentration of liquid sodium will be aroun 8.5 MJ of energy, and I will assume that the temperature will not be increased more than 15 °C.

The expression to calculate the amount of energy is:

Q = m * cp * dT

Where:

m: moles needed

cp: specific heat of the substance.

The cp of liquid sodium reported is 30.8 J/ K mole

Replacing all the data in the above formula, and solving for m we have:

m = Q / cp * dT

dT is the increase of temperature. so 15 ° C is the same change for 15 K.

We also need to know that 1 MJ is 1x10^6 J, so replacing all data:

m = 8.5 * 1x10^6 J / 30.8 J/K mole * 15

m = 18,398.27 moles

The molar mass of sodium is 22.95 g/mol so the mass is:

mass = 18,398.27 * 22.95 = 422,240.26 g or simply 422 kg rounded.

7 0

3 years ago

Why do carbs and fats have the same atoms, but store different amount of energy?

cestrela7 [59]

Carbs have larger molecules

7 0

3 years ago

What is the name of Br6F10 ?

sergey [27]

Answer:

Bromine fluoride

8 0

3 years ago