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3 years ago

Most of the volume of an atom is occupied by

Chemistry

1 answer:

Anna71 [15]3 years ago

3 0

Answer:

An atom is made of protons and neutrons which make up the nucleus and electrons that are around the nucleus. Although almost all the mass of an atom is in the nucleus, most of the space that the atom takes up is occupied by the electrons.

In very simple terms, the electrons are in orbits around the nucleus so most of the volume of the atom is empty space within the volume that the electrons occupy. The behaviour of the electrons is often assumed to be orbits but their actual positions are not that simple.

As a final note, all atoms contain neutrons with the exception of hydrogen which can exist as one proton and one electron.

Explanation:

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Which phrase describes radiation?

stepan [7]

Answer:

The process in which energy is emitted by one object ,transmitted through .......

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3 years ago

Which stament about energy is mostly correct

klasskru [66]

I would say C is the most correct.
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6 0

3 years ago

The reaction of Cr2O3 with silicon metal at high temperatures will make chromium metal. 2CrO3(s) + 3Si(s)----> 4Cr(l) + 3SiO2

nalin [4]

Answer: 51.45 grams of excess reagent is left after the completion of reaction.

Explanation: For the calculation of moles, we use the formula:

$Moles=\frac{\text{Given mass}}{\text{Molar mass}}$ ....(1)

For Si

Given mass = 92 grams

Molar mass = 28g/mol

Putting values in equation 1, we get:

$Moles=\frac{92g}{28g/mol}=3.285moles$

For $Cr_2O_3$

Given mass = 112 grams

Molar mass = 116g/mol

Putting values in equation 1, we get:

$Moles=\frac{112g}{116g/mol}=0.965moles$

The reaction follows:

$2Cr_2O_3(s)+3Si(s)\rightarrow 4Cr(l)+3SiO_2(s)$

By Stoichiometry,

2 moles of $Cr_2O_3$ reacts with 3 moles of silicon

So, 0.965 moles of $Cr_2O_3$ reacts with = $\frac{3}{2}\times 0.965$ = 1.4475 moles of Silicon.

As, the moles of silicon is more than the required amount and is present in excess.

So, the excess reagent for the reaction is Silicon.

Moles of silicon remained after reaction = 3.285 - 1.4475 = 1.8375 moles

To calculate the amount of Silicon left in excess is calculated by using equation 1:

$1.8375=\frac{\text{Given mass}}{28}$

Amount of Silicon in excess will be 51.45 grams.

5 0

4 years ago

Identify the solute and solvent in each solution:

PolarNik [594]

Answer:

a. 6mL of ethanol and 35mL of water: the solute is ethanol (smallest volume) and the solvent is water (greater volume).

b. 300 g of water containing 8g of NaHCO3: the solute is NaHCO3 (smallest mass) and the solvent is water (greater mass).

c. 0.005L of CO2 and 2L of O2: the solute is CO2 (smallest volume) and the solvent is O2 (greater volume).

Explanation:

Hello there!

In this case, according to the given problem, it turns out possible for us to solve these questions by bearing to mind the fact that in a solution, we can find two substances, solute and solvent, whereas the former is in a smaller proportion in comparison to the latter; in such a way, we infer the following:

a. 6mL of ethanol and 35mL of water: the solute is ethanol (smallest volume) and the solvent is water (greater volume).

b. 300 g of water containing 8g of NaHCO3: the solute is NaHCO3 (smallest mass) and the solvent is water (greater mass).

c. 0.005L of CO2 and 2L of O2: the solute is CO2 (smallest volume) and the solvent is O2 (greater volume).

Regards!

4 0

3 years ago

Question has to do with chemistry and is in the picture.

Fittoniya [83]

Answer:

the answer is 69

Explanation:

hope this helps

have an awesome day -TJ

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2 years ago