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4 years ago

What two types of particles exist within an atomic nucleus?

Chemistry

1 answer:

MissTica4 years ago

6 0

Protons and Neutrons, the electrons circle around the nucleus.
Hope this Helps!

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What are the conditions that atoms need to form molecules

bearhunter [10]

Electrons group themselves in pairs in their energy levels. To calculate the number of electrons allowed in any energy level, find the square of the number representing the energy level and multiply it by two. Using this formula, atoms can have two electrons in their first energy level, eight in the second, and eighteen in their third. The quantity of electrons at each level grows as the number of the energy level increases.

7 0

3 years ago

What reaction would be the chemical equation 2H2O->2H2+O2 represent? A.decomposition of water b. Formation of water c. Combus

vodka [1.7K]

It's decomposition
A combustion reaction involves carbon dioxide so it can't be that
The water is not being formed
The water is not replaced by the other molecules
So it is decomposition, not just from process of elimination, but also because decomposing water means heating it.

4 0

4 years ago

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What should be the mole fraction of O2 in the gas mixture the diver breathes in order to have the same partial pressure of oxyge

Nutka1998 [239]

The question is incomplete, here is the complete question:

A scuba diver is at a depth of 355 m, where the pressure is 36.5 atm.

What should be the mole fraction of $O_2$ in the gas mixture the diver breathes in order to have the same partial pressure of oxygen in his lungs as he would at sea level? Note that the mole fraction of oxygen at sea level is 0.209.

Answer: The mole fraction of oxygen in the gas mixture is 0.00573

Explanation:

To calculate the partial pressure, we use the equation given by Raoult's law, which is:

$p_{A}=p_T\times \chi_{A}$ ........(1)

where,

$p_A$ = partial pressure of oxygen at sea level = ?

$p_T$ = total pressure at sea level = 1.00 atm

$\chi_A$ = mole fraction of oxygen at sea level = 0.209

Putting values in equation 1, we get:

$p_{O_2}=1.00atm\times 0.209\\\\p_{O_2}=0.209atm$

As, partial pressure of the oxygen in the diver's lungs is equal to the partial pressure of oxygen at sea level

We are given:

$p_T=36.5atm\\p_{O_2}=0.209atm$

Putting values in equation 1, we get:

$0.209atm=36.5atm\times \chi_{O_2}\\\\\chi_{O_2}=\frac{0.209}{36.5}=0.00573$

Hence, the mole fraction of oxygen in the gas mixture is 0.00573

3 0

3 years ago

What is the total number of joules released when a 5.00-gram sample of water changes from liquid to solid at 0°C?

Marrrta [24]

Energy released from changing the phase of a substance from the liquid phase to solid phase can be calculated by using the specific latent heat of fusion. The heat of fusion of water at 0 degrees Celsius is 334 J/g. Calculation are as follows:

Energy = 5 grams x 334 J/g
Energy = 1670 J

4 0

3 years ago

What do columns on the periodic table tell us?

AfilCa [17]

Answer:

Column on the periodic table tell the number of valence electrons and the types of chemicals, such as metals, nonmetals, alkaline earth metals, metalloids, halogens, noble gases.

Explanation:

3 0

3 years ago

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