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3 years ago

When utilizing a transmission electron microscope, why is it necessary to stain the specimen with heavy metal salts?

2 answers:

6 0

Staining specimen with heavy metal salts (e.g. tungsten, molybdenum) allows you to see the specimen better with higher contrast when electron beam deflects off of your sample.

Orlov [11]3 years ago

4 0

In transmission electron microscope electrons are transmitted through an ultrathin section of a specimen to form a digital image. It necessary to stain the specimen with heavy metal salts to create a contrast such that various cell sub structures are easily visible. For example, DNA is stained with heavy salts such that it is easily visible against the background.

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A 56 g sample of peanut oil has a volume of 60.9 cm³. Calculate the density of the peanut oil

aleksandr82 [10.1K]

Density = mass / volume. So you'd write it out as D = 56g / 60.9cm^3, giving you 0.9195 g/cm^3.

4 0

3 years ago

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Nitric oxide is formed in automobile exhaust when nitrogen and oxygen in air react at high temperatures.N2(g) + O2(g) 2NO(g)The

yanalaym [24]

Answer : The correct option is, (E) 7.8 atm

Explanation :

The partial pressure of $N_2$ = 8.00 atm

The partial pressure of $O_2$ = 5.00 atm

$K_p$ = 0.0025

The balanced equilibrium reaction is,

$N_2(g)+O_2(g)\rightleftharpoons 2NO(g)$

Initial pressure 8.00 5.00 0

At eqm. (8.00-x) (5.00-x) 2x

The expression of equilibrium constant $K_p$ for the reaction will be:

$K_p=\frac{(p_{NO})^2}{(p_{N_2})(p_{O_2})}$

Now put all the values in this expression, we get :

$0.0025=\frac{(2x)^2}{(8.00-x)\times (5.00-x)}$

By solving the terms, we get:

$x=0.15atm$

The equilibrium partial pressure of $N_2$ = (8.00 - x) = (8.00 - 0.15) = 7.8 atm

Therefore, the equilibrium partial pressure of $N_2$ is 7.8 atm.

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4 years ago

Explain why atoms move at different speeds depending on whether they are in liquids or solids.

Ad libitum [116K]

Atoms move at different speeds depending on whether they are in liquids or solids because the atoms or particles in solids are closely bonded while they are loosely bonded in liquids.


The attractive forces between the particles are so high that they remain in fixed positions. The particles, then, cannot slip over the neighbors particles. They can only vibrate. That is why solids have definite form and volume.

That the particles in liquids are loosely bonded means that the attractive forces are less compared with solids. Then the partilces can move and pass each other. They are not in fixed arrangements any more. Yet the particles are attracted to each other, so they have definite volume, although they take the form of the vessel, and they can flow.

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4 years ago

A cation forms when an atom gains one or more electrons. True False

jarptica [38.1K]

Hello,

The answer is false

5 0

3 years ago

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Dl water will test _________for protein?

Ann [662]

Answer:

Total protein range. The normal range for total protein is between 6 and 8.3 grams per deciliter (g/dL). This range may vary slightly among laboratories.

Explanation:

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3 years ago