How many milliliters of a 2.0 M solution of boric acid must be added to 600 mL of a solution of 10 mM sodium borate in order for the pH to be 9.45? (pKa of boric acid = 9.24)

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#Question id: 19586

#XL - P Chemistry

Select the appropriate statement.

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#Question id: 19775

#XL - P Chemistry

Which experimental observation correctly account for the phenomenon?

Experimental observation                                 Phenomenon

(A) X-rays spectra                                              Charge on nucleus

(B) alpha -particle scattering                           Quantized electron orbit .

(C) Photoelectric effect                                      The nuclear atom

(D) Emission spectra                                         Quantization of energy.

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#Question id: 8775

#XL - S Microbiology

Use the following information to answer the question. Paulinella chromatophora is one of the few cercozoans that is autotrophic, carrying out aerobic photosynthesis with its two elongated "chromatophores." The chromatophores are contained within vesicles of the host cell, and each is derived from a cyanobacterium, though not the same type of cyanobacterium that gave rise to the chloroplasts of algae and plants. A crucial photosynthetic gene of the cyanobacterium that gave rise to the chromatophore is called psaE. This gene is present in the nuclear genome of the cercozoan, but is not in the genome of the chromatophore. This is evidence of ________.

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#Question id: 34203

#XL - S Microbiology

For a bacterial species, the following parameters are known:

μmax=0.9 h⁻¹

Ks=0.1 g/L

Substrate concentration S=0.1 g/L 

Calculate the specific growth rate μ.

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#Question id: 9269

#XL - Q Biochemistry

The distribution of electrons in the excited molecule is somewhat different from the distribution in the groundstate molecule, Absorption of blue light excites the chlorophyll to a higher energy state than absorption of red light because