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4 years ago

What did Ernest Rutherford s gold foil experiment demonstrate about atoms?

1 answer:

mote1985 [20]4 years ago

6 0

Rutherford performed gold foil experiment to understand that how negative and positive particles could Co exist in an atom. He bombarded alpha particles on a 0.00004 cm thick gold foil.

He proposed a planetary model of the atom and concluded following results and demonstrated that,
1. An atom produces a line spectrum.
2. An Electron revolves around the nucleus without any orbits.
3. Since most of the particles passed through the foil undeflected it means that most of the volume occupied by an atom is empty.
4. An Atom as a whole is neutral.
5. The deflection of few particles on the foil suggested that there is center of positive particles in an atom called the nucleus of the atom.
6. The complete rebounce of few particles on the gold foil suggested that the nucleus is very dense and hard.

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How many joules are needed to warm 675 grams of water (specific heat= 4.186 J/g degrees Celsius) from 12 degrees Celsius to 85 d

Naya [18.7K]

85-12 = 73 degrees needed
4.186 J/degree Celsius, so
73 degrees * 4.186 J/degree = 305.578 J to raise 1 gram 73 degrees
there are 675 grams, so 305.578 * 675 = 206265.15 J

2.06 x 10^5 J are needed

3 0

3 years ago

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A soft silvery metal has two naturally occurring isotopes: mass 84.9118, accounting for 72.15% and mass 86.9092, accounting for

zloy xaker [14]

Answer: The atomic weight of the metal would be 85.47.

Explanation:

Mass of isotope 1 of metal = 84.9118

% abundance of isotope 1 of metal = 72.15% = $\frac{72.15}{100}$

Mass of isotope 2 of metal= 86.9092

% abundance of isotope 2 of metal = 27.85% = $\frac{27.85}{100}$

Formula used for average atomic mass of an element :

$\text{ Average atomic mass of an element}=\sum(\text{atomic mass of an isotopes}\times {{\text { fractional abundance}})$

$A=\sum[(84.9118)\times \frac{72.15}{100})+(86.9092)\times \frac{27.85}{100}]]$

$A=85.47$

Therefore, the atomic weight of the metal would be 85.47.

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3 years ago

When she dropped a rock into a graduated cylinder of water, Veronica noticed it sank to the bottom. She decided to investigate w

Romashka [77]

A is correct. water is incompressible, so it will always have the same density, regardless of volume

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3 years ago

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Which of the following statements about water is true?

Nikolay [14]

The correct option is: It's solid form is less dense than the liquid form.

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3 years ago

A pure substance that contains more than one atom is called a(n)...

gladu [14]

Answer:

A pure substance that contains more than one atom is called a compound.

Explanation:

Compounds are formed by combination of atoms by a fixed ratio. They have their own characteristic features.
Pure substances are further broken down into elements and compounds. A compound can be destroyed by chemical means. It might be broken down into simpler compounds, into its elements or a combination of the two.

Example

H2SO4 which is formed by combination of three different atoms like H, S and O.

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3 years ago

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