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Lapatulllka [165]
3 years ago
14

PLEASE HELP I HAVE TO DO THIS BENCHAMRK QUESTION!!!

Chemistry
1 answer:
GuDViN [60]3 years ago
8 0
PLEASE HELP I HAVE TO DO THIS BENCHAMRK QUESTION!!!


The chart shows parts of a plant and an animal, at different levels of organization. Consider the plant images. If we are referring to levels of organization in a plant which picture can BEST be used to fill in box Y?

first picture (A
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Which statement describes the energy changes that occur as bonds are broken and formed during a chemical reaction? 1.Energy is a
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Answer:

C

Explanation:

Br + Br-> Br2 (covalent bond)

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A chemist has some 40% acid solution, some 60% acid solution, and a wholebunch of free time. How many liters of each should be u
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Answer:

30 Liters of 40% acid solution and 10 L of 60% acid solution is needed.

Explanation:

Let volume of the 40% acid solution be x.

Let volume of the 60% acid solution be y.

Volume of solution formed after mixing both solution = 40 L

x + y = 40 L..[1]

Volume of acid 40% solution = 40% of x= 0.4x

Volume of acid 60% solution = 60% of y= 0.6y

Volume of acid formed = 45% of 40 L = \frac{45}{100}\times 40=18L

0.4x+0.6y=18 L..[2]

Solving [1] and [2]

x = 30 L  ,   y = 10 L

30 Liters of 40% acid solution and 10 L of 60% acid solution is needed.

8 0
3 years ago
8. Bring the balloon in contact with the wall. What happens to the charges in the wall?
Ne4ueva [31]

When the charged balloon is brought near the wall, it repels some of the negatively charged electrons in that part of the wall. Therefore, that part of the wall is left repelled.

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  • The other material now has an overall positive charge. Because opposite charges attract, the balloon will now appear to stick to the other material. If you didn't rub the balloon first, it's charge would be neutral and it wouldn't stick to the wall.
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Blizzard [7]
CaO because oxygen have 2 dots and calcium as well
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calcium valncy +2)= CaO
3 0
3 years ago
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