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Anastaziya [24]
3 years ago
12

The Bohr model of the atom explained why emission spectra are discrete. It could also be used to explain the photoelectric effec

t. Which is a correct explanation of the photoelectric effect according to the model?
a)Electrons are emitted with more speed when brighter light strikes them.
b)Electrons need small amounts of energy to be released from an atom.
c)Electrons move between levels only if they are hit by the right frequency of light.
d)Electrons need specific amounts of energy to "jump" off an atom and be emitted.
Chemistry
2 answers:
muminat3 years ago
8 0
<span>d)Electrons need specific amounts of energy to "jump" off an atom and be emitted.</span>
asambeis [7]3 years ago
4 0
<span>The Bohr model of the atom explained why emission spectra are discrete. It could also be used to explain the photoelectric effect. A correct explanation of the photoelectric effect according to the model is D. electrons need specific amounts of energy to "jump" off an atom and be emitted.</span>
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Answer please????? Thank you
snow_tiger [21]
Can’t have anything in Detroit
7 0
3 years ago
How much energy (in Joules) is required to convert 129 grams of ice at −23.0 °C to liquid water at 18.0 °C?
Karo-lina-s [1.5K]

Answer:

The energy that is required for the process is:

6230.7 J + 42957 J + 9715.2 J = <u>58902.9 joules</u>

Explanation:

This is a calorimetry problem:

Q = m . C . ΔT

Q = heat; m = mas; C is the specific heat and

ΔT = Final T° - Initial T°

Q = C lat . m

Q = Heat

m = mass

C lar = Latent heat of fusion

First of all we calculate the heat for ice, before it takes the melting point. (from -23°C  to 0°C)

Q = 129 g . 2.10 J/g°C . (0°C - (-23°C)

Q = 129 g . 2.10 J/g°C . 23°C → 6230.7 joules

Then, the ice has melted. To be melted and change the state it required:

Q = C lat . m

Q = 333 J/°C . 129 g → 42957 joules

And in the end, we have water that changed its T° from O°C to 18°C

Q = 129 g . 4.184 J/g °C . (18°C - 0°C)

Q = 9715.2 Joules

The energy that is required for the process is:

6230.7 J + 42957 J + 9715.2 J = 58902.9 joules

5 0
3 years ago
If the reduction reaction has a reduction potential of 0.1 V, and the oxidation reaction has a reduction potential of -0.4V, and
aleksley [76]

Answer : The value of ΔG expressed in terms of F is, -1 F

Explanation :

First we have to calculate the standard electrode potential of the cell.

E^o=E^o_{cathode}-E^o_{anode}

or,

E^o=E^o_{reduction}-E^o_{oxidation}

E^o=(0.1V)-(-0.4V)=+0.5V

Now we have to calculate the standard cell potential.

Formula used :

\Delta G^o=-nFE^o

where,

\Delta G^o = Gibbs free energy = ?

n = number of electrons = 2

F = Faraday constant

E^o = standard e.m.f of cell = +0.5 V

Now put all the given values in this formula, we get the Gibbs free energy.

\Delta G^o=-(2\times F\times 0.5)

\Delta G^o=-1F

Therefore, the value of ΔG expressed in terms of F is, -1 F

5 0
3 years ago
What kind of reaction is AgNO3+KI —&gt; AgI+KNO3?
Scilla [17]

Answer:

Substitution reaction

5 0
3 years ago
Pliss help
Vladimir [108]

Answer: I believe it is artificial selection (not certain though)

Explanation: modern day dogs have been bread an domesticated to be used by humans in ways we see fit.

5 0
3 years ago
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