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3 years ago

Which model of the atom first introduced the idea of a nucleus?

Chemistry

2 answers:

ankoles [38]3 years ago

5 0

The answer is c.) Rutherford model

liq [111]3 years ago

5 0

the answer to your question is c. rutherfords model

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What is the balanced chemical equation when an aqueous solution of calcium hydroxide reacts with liquid water?

Dmitrij [34]

Explanation:

Equation for Calcium Hydroxide Dissolving in Water | Ca(OH)2 + H2O

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The body is a system of interacting subsystems composed of a group of specialized cells and tissues because....

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3 years ago

Air is made of mostly oxygen, nitrogen, argon, carbon dioxide, and small amounts of other substances. Air is a ___________.

mixas84 [53]

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3 years ago

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A balloon is filled with 2.5 L of helium at 1 atm of pressure. If the pressure

ch4aika [34]

Answer:

5 L

Explanation:

Given data

Initial pressure (P₁): 1 atm

Initial volume (V₁): 2.5 L

Final pressure (P₂): 0.50 atm

Final volume (V₂): ?

For a gas, there is an inverse relationship between the pressure and the volume. Mathematically, for an ideal gas that undergoes an isothermic change, this is expressed through Boyle's law.

$P_1 \times V_1 = P_2 \times V_2\\V_2 = \frac{P_1 \times V_1}{P_2} = \frac{1atm \times 2.5L}{0.50atm}= 5 L$

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3 years ago

A sample of gaseous neon atoms at atmospheric pressure and 0 °c contains 2.69 * 1022 atoms per liter. the atomic radius of neon

omeli [17]

Explanation

Radius of neon atom : 69 pm = $69\times 10^{-12} m$

Volume occupied by the one atom: $\frac{4}{3}\pi r^3$

$=\frac{4}{3}\times 3.14\times(69\times 10^{-12} m)^3=1.37\times 10^{-30} m^3$

given that $2.69\times 10^{22}$ atoms are present in 1L

1 L = 0.001 $m^3$

The volume occupied by the $2.69\times 10^{22}$ neon atoms

$2.69\times 10^{22}\times 1.37\times 10^{-30} m^3=3.68\times 10^{-8} m^3$

Fraction of volume occupied by the neon atom:

$=\frac{3.68\times 10^{-8} m^3}{0.001 m^3}=3.68\times 10^{-11} m^3$

$3.68\times 10^{-11} m^3$

The fraction of of volume occupied by the neon atom is very less than the 1 L which indicates the presence of large amount of empty space between the atoms of the gas.

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3 years ago