Define and explain what an atom is

1 answer:

8 0

Hi,

Atom is the second smallest form of any matter behind elementary particles. They are not visible to human eye. It consists of protons and neutrons in the atom core and electrons outside its core. All protons, neutrons and electrons are a part of atomic nuclei.

The more neutrons atom haves the bigger the mass of an atom is.

Number of electrons determines which element does atom represent. The more electrons atom haves the heavier element atom represents.

Different elements have different properties.

Hope this helped you understand what atom is better.

Hope this helps.
r3t40

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At a given temperature the vapor pressure of pure liquid benzene and toluene are 745 torr and 290 torr, respectively. A solution

IRISSAK [1]

Answer:

Vapour pressure of benzene over the solution is 253 torr

Explanation:

According to Raoult's law for a mixture of two liquid component A and B-

vapour pressure of a component (A) in solution = $x_{A}\times P_{A}^{0}$

vapour pressure of a component (B) in solution = $x_{B}\times P_{B}^{0}$

Where $x_{A},x_{B}$ are mole fraction of component A and B in solution respectively

$P_{A}^{0},P_{B}^{0}$ are vapour pressure of pure A and pure B respectively

Here mole fraction of benzene in solution is 0.340 and vapour pressure of pure benzene is 745 torr

So, vapour pressure of benzene in solution = $0.340\times 745 torr$

= 253 torr

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4 years ago

4 HF(g)+SiO2(s) → SiF4(9)+2 H2O(9) Is the Si oxidized or reduced?

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Answer:

Si is reduced since it loses the oxygen atom

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Why is it better to measure the percent change in mass ratherthan just using the change in mass?

never [62]

Answer: The result is presented in proportion which gives a clearer understanding and accurate result.

Explanation: Percentage change in mass is the proportion of the initial mass of a substance changed after sometime. The results is presented as a percentage making it more accurate and can help to give future reference to weight calculations.

Change is Mass is the mass of a substance left after sometime mostly given in grams. It is not as accurate as percentage change in mass. It is generally better to show results in percentage change in mass as it gives a better understanding of what mass of a substance was lost after a given period or after application of energy like Heat or increased temperature.

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How are transuranium elements made?

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Explanation:

The transuranium elements are produced by the capture of neutrons

Hope it will help you