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3 years ago

Why is grass green? Also why is the sky blue???

2 answers:

5 0

Like many plants, most species of grass produce a bright pigment called chlorophyll. Chlorophyll absorbs blue light (high energy, short wavelengths) and red light (low energy, longer wavelengths) well, but mostly reflects green light, which accounts for your lawn's color.

sky is blue because molecules in the air scatter blue light from the sun more than they scatter red light. When we look towards the sun at sunset, we see red and orange colors because the blue light has been scattered out and away from the line of sight.

Hope this Helped!

erastova [34]3 years ago

4 0

The plant has a specific cell that makes it appear green it is call chlorophyll. And the sky is blue because molecules in the air scatter blue light from the sun more then they scatter red light. When we look towards the sun at sunset, we see red and orange colors because the blue light has been scattered out and away from the line of sight.

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A student has to design a titration experiment to determine the concentration of an unknown acid. Answer questions a–f.

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3 years ago

Please help! Thanks!

olya-2409 [2.1K]

Answer:

The deviations are :

The activation energy which changes with temperature
The arrhenius constant which depends on the temperature

Explanation:

There are deviations from the Arrhenius law during the glass transition in all classes of glass-forming matter.

The Arrhenius law predicts that the motion of the structural units (atoms, molecules, ions, etc.) should slow down at a slower rate through the glass transition than is experimentally observed.
In other words, the structural units slow down at a faster rate than is predicted by the Arrhenius law.
This observation is made reasonable assuming that the units must overcome an energy barrier by means of a thermal activation energy.
The thermal energy must be high enough to allow for translational motion of the units which leads to viscous flow of the material.

Both the Arrhenius activation energy and the rate constant k are experimentally determined, and represent macroscopic reaction-specific parameters that are not simply related to threshold energies and the success of individual collisions at the molecular level.
Consider a particular collision (an elementary reaction) between molecules A and B. The collision angle, the relative translational energy, the internal (particularly vibrational) energy will all determine the chance that the collision will produce a product molecule AB.
Macroscopic measurements of E(activation energy) and k(rate constant ) are the result of many individual collisions with differing collision parameters. They are averaged out to a macroscopic quantity.

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3 years ago

Various pieces of safety equipment are used in the lab to provide protection against injury. Which of the following pieces of la

Aleks [24]

Answer:

Explanation:

When a chemical substance gets in contact with an individuals eye in a laboratory, there is an area called the eye wash station that is used for washing off these substances. This station is important because when a chemical substance enters tour eye(s) you need to wash it off within 15 minutes after the injury has occurred.

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3 years ago

What mass of hydrogen gas would completely react with 40 grams of Oxygen gas?

ArbitrLikvidat [17]

Answer:

The equation of reaction pls

Does it react to form water

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3 years ago

Identify the effect of increasing acidity on the solubility of the given compounds. Drag the appropriate items to their respecti

PIT_PIT [208]

Answer:

Ca3(PO4)2- Increase in solubility

Barium hydroxide- increase in solubility

Magnesium carbonate- increase in solubility

Copper II sulphide- increase solubility

Lead II bromide- increase solubility

CuI - increase solubility

Explanation:

Calcium phosphate solubility is pH dependent. At lower pH, calcium phosphate is more soluble in water while at pH above 8.5, the solubility of calcium phosphate decreases markedly.

For Barium hydroxide and magnesium carbonate,decreasing the pH will increase the solubility of the compound.

For copper II sulphide,decreasing the pH will lead to a greater solubility. Also, lead II bromide is ordinarily insoluble in water but it's solubility increases with decreasing pH.

CuI is insoluble in water but soluble in dilute hydrochloric acid.

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3 years ago