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makkiz [27]
2 years ago
8

What did Niels Bohr describe electrons in his atomic model

Chemistry
1 answer:
Bess [88]2 years ago
4 0

Neils bohar proposed his atomic model in 1913.

He describe that's electron travel in a circular orbit surrounds the neuclus of an atom.each orbit has quantized energy and size. Energy is transmitted when an electron jumps from one to other orbit near to nucleus.and it absorb energy when it jumbs away from nucleus.he also said that these electrons are restricted to fixed orbits. In excited state of electron, they absorb or emitt photon with specific wavelength.

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A weather balloon contains 394 L of hydrogen gas at STP. How many moles of hydrogen are present?
Harman [31]

Answer:

PV=nRT

STP is 100kPa and 273.15K

PV/RT=n

n=17.3moles

Explanation:

4 0
2 years ago
Calculate the heat required to convert 52.5 g of c2cl3f3 from a liquid at 11.05 ∘c to a gas at 76.65 ∘c.
Lorico [155]
<span>Answer: We heated up the liquid CFC from 11.05 degrees celsius to its boiling point (47.6 degrees) That means we heated it up 36.55 degrees The formula to solve this is C = Q / M x dT where C is the specific heat of the liquid CFC (.91 J/G/C) Q is the amount of heat required (what we're trying to find out) M is the mass (52.5 grams) and dT is the temperature difference (36.55 degrees) Now put in the values and find out what Q is .91 = Q / 52.5 x 36.55 .91 = Q / 1918.875 Q = 1746.17 joules to heat up the liquid CFC</span>
8 0
3 years ago
The validity of scientific theories and laws depends on evidence. Which of the following statements of evidence supports a law r
Ksju [112]

Answer:

d the amount of matter in a closed system is the same at the start of a reaction as at the end of the reaction

4 0
2 years ago
Read 2 more answers
The heat of fusion for water is the amount of energy that must be absorbed for water to ___. a.evaporate b.freeze a.boil d.melt
Vikki [24]
The answer would be A. Evaporation. Heat of fusion in any types of matter is the amount of heat transfer to a matter that allows it to change its form by gathering or absorbing an amount of heat that could change is form either its from solid to liquid, liquid to gas or vice versa. 
7 0
2 years ago
Need help I don’t understand this at all need to show my work and strategy it’s stoichiometry gram to gram please help
laila [671]

Answer:

781×10¯² g of MgCl₂.

Explanation:

The balanced equation for the reaction is given below:

Mg + 2HCl —> MgCl₂ + H₂

Next, we shall determine the mass of HCl that reacted and the mass of MgCl₂ produced from the balanced equation. This is illustrated below:

Molar mass of HCl = 1 + 35.5

= 36.5 g/mol

Mass of HCl from the balanced equation = 2 × 36.5 = 73 g

Molar mass of MgCl₂ = 24 + (35.5×2)

= 24 + 71

= 95 g/mol

Mass of MgCl₂ from the balanced equation = 1 × 95 = 95 g

SUMMARY:

From the balanced equation above,

73 g of HCl reacted to produce 95 g of MgCl₂.

Finally, we shall determine the mass of MgCl₂ produced by the reaction of 6 g of HCl. This can be obtained as follow:

From the balanced equation above,

73 g of HCl reacted to produce 95 g of MgCl₂.

Therefore, 6 g of HCl will react to produce = (6 × 95)/73 = 781×10¯² g of MgCl₂.

Thus, 781×10¯² g of MgCl₂ were obtained from the reaction.

4 0
3 years ago
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