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Dafna1 [17]
3 years ago
5

What are real world examples of chemical changes?

Chemistry
1 answer:
Stels [109]3 years ago
5 0
Burning paper because it can’t be changed back
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What are the two ways light moves through space? for astronomy the solar system
Mariana [72]

Answer:

The Solar System moves through the galaxy with about a 60° angle between the galactic plane and the planetary orbital plane. The Sun appears to move up-and-down and in-and-out with respect to the rest of the galaxy as it revolves around the Milky Way

Explanation:

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7 0
2 years ago
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A system gains 652 kJ of heat, resulting in a change in internal energy of the system equal to +241 kJ. How much work is done?
levacccp [35]

Answer:

-411 kj

Explanation:

We solve by using this formula

∆U = ∆Q + ∆W

This formula is the first law of thermodynamics

Change in internal energy U = +241

Heat gained by system Q = 652

Putting the value into the equation

+241 = 652 + W

Workdone = 241 - 652

Workdone = -411 kj

Since work done is negative it means that work was done by the system

3 0
3 years ago
What is one thing people can do to reduce the amount of carbon in the
Nimfa-mama [501]

Answer:

B

Explanation:

Planting trees sequesters CO2

  all of the other choices produce more CO2 in the atmosphere

8 0
2 years ago
Describe the basic particle from which all elements are made.
Nadya [2.5K]
Isnt the basic particle that all elements are made of electrons because i know that you can get isotopes which is a whole different subject
5 0
3 years ago
What is the best name for the molecule below?
Sati [7]
You start numbering from <span>the side with the methyl group and find the longest chain, which is seven = hept. The triple bond is -yne at C3. The methyl group is on C2.
This means that the best name for this molecule is </span><span>2-methyl-3-heptyne.</span>
6 0
3 years ago
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