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n200080 [17]
3 years ago
14

If oxygen is removed from a sample of air as iron rusts, what happens to the partial pressure of oxygen in the air? A it increas

es B it decreases or C stays the same
Chemistry
2 answers:
alukav5142 [94]3 years ago
6 0

The answer to your question is

B it decreases

anzhelika [568]3 years ago
3 0
Bi did that test before

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likoan [24]
They occur in patterns because certain features are formed at the site of the three types of plate boundaries.
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Why is the amount of usable energy lower for anaerobic respiration than for aerobic respiration
photoshop1234 [79]
Anaerobic is when there is not enough oxygen for aerobic respiration, so it uses glucose and lactic acid for example instead of glucose and oxygen for aerobic. Anaerobic takes longer to convert to energy. 
3 0
3 years ago
Mass is 5 grams and the volume is 4.5 grams what is the density
STatiana [176]
Density = Mass/Volume

d= 5 / 4.5
8 0
3 years ago
which of the following amino acids are used to measure the protein concentration by UV? A. His B. Pro C. Trp D. Phe E. Tyr
Goryan [66]

Answer:

C. Trp D. Phe E. Tyr

Explanation:

The concentration of a protein has a direct relation with absorbance of the protein in a UV spectrophotometer. The formula which relates concentration with absorbance is described as under:

                A = ∈ x c x l

where, A = Absorbance

            ∈ = Molar extinction co-efficient

            c  = Concentration of absorbing species i.e. protein

             l  = Path length of light

       

Tryptophan (Trp), phenylalanine (Phe ) and tyrosine (Tyr) are three aromatic amino acids which are used to measure protein concentration by UV. It is mainly because of tryptophan (Trp), protein absorbs at 280 nm which gives us an idea of protein concentration during UV spectroscopy.

The table depicting the wavelength at which these amino acids absorb and their respective molar extinction coefficient is as under:

Amino acid                Wavelength            Molar extinction co-efficient (∈)

Tryptophan                     282 nm                        5690

Tyrosine                          274 nm                        1280

Phenylalanine                 257 nm                        570

In view of table above, we can easily see that Molar extinction co-efficient (∈) of Tryptophan is highest amongst all these 3 amino acids that is why it dominates while measuring concentration.

7 0
3 years ago
How many electrons are shared in the Lewis structure
Diano4ka-milaya [45]
Hey there,

Answer:

4 valence electrons.

Hope this helps :D

<em>~Top☺</em>
3 0
3 years ago
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