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balu736 [363]
3 years ago
6

Rutherford bombarded gold foil with alpha (a) particles and found that a small percentage of the particles were deflected. Which

of the following was not accounted for by the model he proposed for the structure of atoms?
A. the presence of electrons on shells outside the nucleus
B. the presence of neutrons
Chemistry
1 answer:
Alex73 [517]3 years ago
8 0

Answer:

The presence of neutrons

Explanation:

Based on gold foil experiments, Rutherford proposed a atomic model known as Rutherford'd model or nuclear model or planetary model of the atom.

As per this model, most of the mass of the atom is concentrated in the center of the atom known as nucleus.

Electrons revolve around it same as planet revolve around sun.

Since, neutrons had not been discovered at the time of Rutherford'd model, therefore, as per the Rutherford'd model, nucleus is only made of protons.

Therefore, the correct option is option B

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On a 7 day wilderness expedition you'll need to heat 4.0kg of water to the boiling point each day. The air temperature will aver
max2010maxim [7]

Answer:

38 canisters

Explanation:

The combustion of propane can be represented by the equation below:

C₃H₈ (g) + O₂ (g) → CO₂ (g) + H₂O(g)     ΔHc = -103.85 kJ/mol

The boiling of water is represented below:

H₂O(l) → H₂O(g)    ΔH = Q = mcΔT

The heat necessary to make water reach the boiling point is Q, which is calculated with the mass of water (m = 4.0 kg), its specif heat capacity ( c = 4.200 J/kg°C) and temperature variation (ΔT = 100 - 25)

Therefore, ΔH = Q = 4.0 kg x 4.200 kJ/kg°C x 75 °C

ΔH = Q = 1260.0 kJ

This is the amount of heat necessary to heat the water every day. Since the expedition will last 7 days, the total heat will be 8820 kJ

Now we need to calculate the amount of propane needed to generate this heat:

1 mol C₃H₈ _______ 103.85 kJ

X                 _______ 8820 kJ

x = 84.9 mol C₃H₈

1 mol C₃H₈ _____ 44 g

84.9 mol C₃H₈ ___ x

x = 3735.6 g

1 canister _____ 100 g C₃H₈

x               _____ 3735.6 g

x = 37.3 canisters

The minimum number of fuel canisters I must bring is 38 canisters.

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Ara Ara... well... hope this helps

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