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REY [17]
3 years ago
6

Are all physical reactions reversible?

Chemistry
1 answer:
ivann1987 [24]3 years ago
7 0
No not all. for example cutting down a tree is a physical reaction/change but it is not something you can redo.
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During which of the following months is the sun likely to illuminate Earth equally from pole to pole?
Gekata [30.6K]
<span>The sun likely to illuminate Earth equally from pole to pole during March and September.

During these two months, both poles receive the same amount of light. This time is called Equinox. 

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3 years ago
Why is grass green? Also why is the sky blue???
lara31 [8.8K]
<span>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.

</span>sky<span> is </span>blue<span> because molecules in the air scatter </span>blue<span> 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 </span>blue<span> light has been scattered out and away from the line of sight.
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5 0
3 years ago
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In general, which two factors determine the overall temperature of earth's atmosphere?
ehidna [41]
These two factors are:
*radiation coming into the Earth's atmosphere
*radiation going out the Earth's atmosphere

These two factors could be lumped into one natural phenomenon called the greenhouse effect. The Earth's atmosphere is a very unique characteristic in the solar system because it makes the planet livable. Without the atmosphere's work, the day would be too hot and the night would be too cold. The trapping of radiation, hence heat, keeps the overall temperature of the Earth.
3 0
4 years ago
What is the % by mass of oxygen in Mg(NO3)2 ?
Mashcka [7]

Answer:

72.71 %

Explanation:

For oxygen: mass % O = (mass of 1 mol of oxygen/mass of 1 mol of CO2) x 100. mass % O = (32.00 g / 44.01 g) x 100. mass % O = 72.71 %

HOPED THIS HELPED YOU OUT

A brainliest is always appreciated.

5 0
3 years ago
Metallic materials are becoming more and more widely used. They have
weqwewe [10]

Answer:

Its B

Explanation:

hope its help by the way iam dream

7 0
3 years ago
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