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3 years ago

9

How a forensic scientist may match DNA of evidence to a particular crime?

1 answer:

Evgen [1.6K]3 years ago

7 0

Forensic scientists can compare DNA found at a crime scene (from blood or hair, for example) to DNA samples taken from suspects. If there is no match, they may be able to rule out that suspect. If there is a match, police will likely want to take a closer look.

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Which term defines the following: moles of solute mass of solvent in kg?

kramer

The answer is B. molality

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3 years ago

Ca (ClO) 2<br> Spell out the full name of the compound.

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Calcium hypochlorite

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How many significant figures does 0.0006510 of have?

arsen [322]

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4 years ago

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An important reaction in the formation of photochemical smog is the photodissociation of NO2: NO2 + hv >>> NO(g) + O(g)

vaieri [72.5K]

Explanation:

$NO_2 + hv\rightarrow NO(g) + O(g)$

The maximum wavelength of light that can cause this reaction is 420 nm.

a) The wavelength given lies in the range of visible light range that is from 400 nano meters to 700 nano meters.

The light with wavelength of 420 nm is found in the range of visible light.

b)The maximum strength of a bond :

$E=\frac{h\times c}{\lambda}$

where,

E = energy of photon = Energy required to break single molecule of nitrogen dioxide

h = Planck's constant = $6.626\times 10^{-34}Js$

c = speed of light = $3\times 10^8m/s$

$\lambda$ = wavelength = $420 nm=420\times 10^{-9}m$

$E=\frac{6.626\times 10^{-34}Js\times 3\times 10^8 m/s}{420\times 10^{-9}m}$

$E=4.733\times 10^{-19} J$

Energy required to break 1 mole of nitrogen dioxide molecules:

$= E\times N_A=4.733\times 10^{-19} J\times 6.022\times 10^{23} mol^{-1}$

$=285,012.66 J/mol=285.13 kJ/mol$

(1 J = 0.001 kJ )

285.13 is the maximum strength of a bond, in kJ/mol, that can be broken by absorption of a photon of 420-nm light.

c) the photodissociation reaction showing Lewis-dot structures is given in an image attached.

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4 years ago

When comparing plant and animal cells which statement is least accurate?

IrinaK [193]

Here is a diagram comparing both plant and animal cells.
Hope it helps:)

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3 years ago

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