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2 years ago

What is the chemical formula of sodium carbonate?

Chemistry

1 answer:

Gekata [30.6K]2 years ago

6 0

Answer:

Na2CO3 is the formula for sodium carbornate

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Which has the largest atomic radius calcium bromide barium and astatine

Fantom [35]

The one with the largest atomic radius is barium

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3 years ago

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The molar absorptivity of a tyrosine residue at 280 nm is 2000 M-1cm-1, while for tryptophan it is 5500 M-1cm-1. A protein has b

adelina 88 [10]

Answer:

There are 4 tryptophans in the protein.

Explanation:

According to question, protein contains one tyrosine residue and say x number of tryptophans.

Concentration of protein solution = 1.0 micromolar = $1.0\times 10^{-6} Molar$

Molar absorptivity of a protein solution : $\epsilon$

$\epsilon = \epsilon _{tyro}+\epsilon _{tryp}$

$=1\times 2000 M^{-1}cm^{-1}+x\times 5500 M^{-1}cm^{-1}$

Length of the cuvette = l = 1.0 cm

Absorbance of protein solution at 280 nm = A = 0.024

$A=\epsilon \times l\times c$ ( Beer-Lambert's law)

$0.024=(1\times 2000 M^{-1}cm^{-1}+x\times 5500 M^{-1}cm^{-1})\times 1 cm\times 1.0\times 10^{-6} M$

Solving for x :

x = 4

There are 4 tryptophans in the protein.

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3 years ago

Compare and contrast reflecting and refracting telescopes. *

Alinara [238K]

A refracting telescope uses convex lenses to gather a large amount of light and focus it onto a small area while a reflecting telescope the mirror instead of an objective lens they are also similar because like the lenses in a refracting telescope the mirror in a reflecting telescope focuses a large amount of light onto a small area.

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3 years ago

Q- Which two positions show the location of the moon in its gibbous phases as seen from Earth?

Phoenix [80]

Answer: 6 & 8

Explanation:

I got it correct on my test hope this helped

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3 years ago

What behavior of light PROVES that it is a wave? Hint: will this ONLY happen because light is a wave, or could it also be true o

irina [24]

Answer:

Light changes speed in a glass of water.

Explanation:

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3 years ago