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zubka84 [21]
3 years ago
12

Plant Pigments and Photosynthesis

Chemistry
1 answer:
Nostrana [21]3 years ago
3 0

Answer:

1. Chlorophyll A has a yellow-green pigment and absorbs at a wavelength of 430-662 nm.  Chlorophyll B has a blue-green pigment and absorbs at a wavelength of 453-642 nm. Carotene has an orange pigment and absorbs at a wavelength of 460-550 nm. Xanthophyll has a yellow pigment and absorbs at a wavelength of 700 nm. Anthocyanin has a purple pigment and absorbs at a wavelength of 660 nm.

2. Plant and planktons that survive by photosynthesis do so with the help of pigments. These pigments help them trap light ( e.g sunlight). When this happens a reflection occurs which gives rise to the pigment colour observed which is usually not absorbed. A typical example is seen in chlorophyll which is green pigmented hence it absorbs all other wavelengths of light the except green.

3. The various ways in which the rate of photosynthesis can be measured include: Measuring the amount of carbon(IV)oxide uptake as well as measuring the amount of oxygen produced.

The reason for the colour change in deciduous trees in the fall is because the chlorophyll in the leaves of the plants is broken down leading to the loss of the green colouration. Also, the presence of anthocyanin can also be responsible for the yellow pigmentation.

5. Due to the evolution of species, and the fact that life originated from microbes, microbes have evolved from the single membrane to more complex systems with specialized organs like the mitochondria and chloroplasts. Early microbes were photosynthetic in nature e.g phytoplanktons which have evolved specialized systems controlled by the DNA to ensure their survival.

 

Explanation:

1. Chlorophyll A has a yellow-green pigment and absorbs at a wavelength of 430-662 nm.  Chlorophyll B has a blue-green pigment and absorbs at a wavelength of 453-642 nm. Carotene has an orange pigment and absorbs at a wavelength of 460-550 nm. Xanthophyll has a yellow pigment and absorbs at a wavelength of 700 nm. Anthocyanin has a purple pigment and absorbs at a wavelength of 660 nm.

2. Plant and planktons that survive by photosynthesis do so with the help of pigments. These pigments help them trap light ( e.g sunlight). When this happens a reflection occurs which gives rise to the pigment colour observed which is usually not absorbed. A typical example is seen in chlorophyll which is green pigmented hence it absorbs all other wavelengths of light the except green.

3. The various ways in which the rate of photosynthesis can be measured include: Measuring the amount of carbon(IV)oxide uptake as well as measuring the amount of oxygen produced.

The reason for the colour change in deciduous trees in the fall is because the chlorophyll in the leaves of the plants is broken down leading to the loss of the green colouration. Also, the presence of anthocyanin can also be responsible for the yellow pigmentation.

5. Due to the evolution of species, and the fact that life originated from microbes, microbes have evolved from the single membrane to more complex systems with specialized organs like the mitochondria and chloroplasts. Early microbes were photosynthetic in nature e.g phytoplanktons which have evolved specialized systems controlled by the DNA to ensure their survival.

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Which of the following corresponds to an alpha particle?
andrey2020 [161]

Answer:

Atomic number=No. of protons=No. of electrons in ground state(unchanged atom)

Atomic number=13=No. of protons

Atomic mass=no. of protons+no. of neutrons=13+14=27

For isotope no. of proton=13(same atomic number but different mass number are isotopes)

no. of electrons=13

no. of neutrons=14+2=16

Explanation:

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4 0
2 years ago
The following data were obtained in a kinetics study of the hypothetical reaction A + B + C → products. [A]0 (M) [B]0 (M) [C]0 (
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Answer:

B. First order, Order with respect to C = 1

Explanation:

The given kinetic data is as follows:

A + B + C → Products

     [A]₀     [B]₀    [C]₀       Initial Rate (10⁻³ M/s)

1.   0.4      0.4     0.2       160

2.  0.2      0.4      0.4       80

3.   0.6     0.1       0.2       15

4.   0.2     0.1       0.2        5

5.   0.2     0.2      0.4       20

The rate of the above reaction is given as:

Rate = k[A]^{x}[B]^{y}[C]^{z}

where x, y and z are the order with respect to A, B and C respectively.

k = rate constant

[A], [B], [C] are the concentrations

In the method of initial rates, the given reaction is run multiple times. The order with respect to a particular reactant is deduced by keeping the concentrations of the remaining reactants constant and measuring the rates. The ratio of the rates from the two runs gives the order relative to that reactant.

Order w.r.t A : Use trials 3 and 4

\frac{Rate3}{Rate4}= [\frac{[A(3)]}{[A(4)]}]^{x}

\frac{15}{5}= [\frac{[0.6]}{[0.2]}]^{x}

3 = 3^{x} \\\\x =1

Order w.r.t B : Use trials 2 and 5

\frac{Rate2}{Rate5}= [\frac{[B(2)]}{[B(5)]}]^{y}

\frac{80}{20}= [\frac{[0.4]}{[0.2]}]^{y}

4 = 2^{y} \\\\y =2

Order w.r.t C : Use trials 1 and 2

\frac{Rate1}{Rate2}= [\frac{[A(1)]}{[A(2)]}]^{x}[\frac{[B(1)]}{[B(2)]}]^{y}[\frac{[C(1)]}{[C(2)]}]^{z}

we know that x = 1 and y = 2, substituting the appropriate values in the above equation gives:

\frac{160}{80}= [\frac{[0.4]}{[0.2]}]^{1}[\frac{[0.4]}{[0.4]}]^{2}[\frac{[0.2]}{[0.4]}]^{z}

1 = (0.5)^{z}

z = 1

Therefore, order w.r.t C = 1

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