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3 years ago

Name at least three types of energy associated with a microwave

Chemistry

1 answer:

DerKrebs [107]3 years ago

8 0

Heat from warming the food, electromagnet which is electric and magnet energy which can count for 2

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The graph models the amount remaining, in milligrams, of a radioactive substance as a function of time, in years. Explain the me

timama [110]

Answer:

Where is the grahppppp?!!!!

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3 years ago

What causes the temperature to decrease with altitude in the troposphere?

kvasek [131]

the temperature decreases with height here just like it does in the troposphere.

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4 years ago

A galvanic cell at a temperature of 42 degrees Celcius is powered by the following redox reaction:

seropon [69]

Answer: The cell voltage of the given reaction is 1.86 V

Explanation:

The given chemical equation follows:

$3Cu^{2+}(aq.)+2Al\rightarrow 2Al^{3+}(aq.)+2Au(s)$

Oxidation half reaction: $Al(aq.)\rightarrow Al^{3+}(aq.)+3e^-;E^o_{Al^{3+}/Al}=1.66V$ ( × 2)

Reduction half reaction: $Cu^{2+}(aq.)+2e^-\rightarrow Cu(s);E^o_{Cu^{2+}/Cu}=0.16V$ ( × 3)

Oxidation reaction occurs at anode and reduction reaction occurs at cathode.

To calculate the $E^o_{cell}$ of the reaction, we use the equation:

$E^o_{cell}=E^o_{cathode}-E^o_{anode}$

Putting values in above equation, we get:

$E^o_{cell}=0.16-(-1.66)=1.82V$

To calculate the EMF of the cell, we use the Nernst equation, which is:

$E_{cell}=E^o_{cell}-\frac{2.303RT}{nF}\log \frac{[Al^{3+}]^2}{[Cu^{2+}]^3}$

where,

$E_{cell}$ = electrode potential of the cell = ? V

$E^o_{cell}$ = standard electrode potential of the cell = +1.82 V

n = number of electrons exchanged = 2

R = Gas constant = 8.314 J/mol Kl

T = temperature = $42^oC=[42+273]K=315K$

F = Faraday's constant = 96500

$[Al^{3+}]=1.63M$

$[Cu^{2+}]=3.43M$

Putting values in above equation, we get:

$E_{cell}=1.82-\frac{2.303\times 8.314\times 315}{2\times 96500}\times \log(\frac{(1.63)^2}{(3.43)^3})\\\\E_{cell}=1.86V$

Hence, the cell voltage of the given reaction is 1.86 V

4 0

3 years ago

How many grams of carbon dioxide are produced by the combustion of 75.3 g of octane (C8H18)? (answer rounded to nearest whole nu

a_sh-v [17]

Answer:

232 g CO2

2 C8H18 + 25 O2 --> 16 CO2 + 18 H2O

75.3 g C8H18 (1mol / 114.26g) (16 mol CO2/2 mol C8H18) (44.01 g/1 mol) = 232 g

Hope this helps!

6 0

3 years ago

What is photolytic decomposition ??? explain !!!

ella [17]

A photodecomposition reaction is a kind of decomposition reaction wherein the reactant is broken down by absorbing energy from photons into its constituents. The decomposition into dioxygen and an oxygen radical, as illustrated by the chemical equation given below, is an example of a photo decomposition reaction.

O3+ hν → O2+ O.O3+ hν → O2+ O.

Excitation energy hops from light-capturing pigment molecules to reaction centre molecules step-by-step along the molecular energy ladder, according to the traditional, semi-classical model of photosynthetic energy transfer.

The absorption spectra of the photosynthetic pigments in the organism determine the efficiency of photons of various wavelengths. Chlorophylls absorb light in the violet-blue and red spectrums, whereas accessory pigments absorb light in other wavelengths. Red algae can photosynthesize in deep seas because their phycobilins absorb blue-green light, which penetrates further into water than red light. In the pigment molecule, each absorbed photon triggers the creation of an exciton (an electron stimulated to a higher energy state).

3 0

3 years ago

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