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nordsb [41]
3 years ago
13

3. Which element is most important for growing crops?

Chemistry
1 answer:
madreJ [45]3 years ago
8 0

Answer:

B. hydrogen

Explanation:

that's because hydrogen is an element.

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PLEASE HELPP ASAP!!!!!What is the equation for density A. D=M/V B. D=V/M C. D= M/V2 D. D=1/2 MV2
mestny [16]

The correct answer is option A.

D = M/V

The density of a substance is the ratio of its mass to its volume.

Density = mass / volume

or D = M/V

The unit of density is gram per milliliter or g/ml, when mass is expressed in gram or g and the volume is expressed in milliliter ml.

If we know the mass and volume of a substance we can calculate its density using the formula for density.


8 0
3 years ago
What are "representative elements"?
Mars2501 [29]

Answer: c. elements in the same row of the periodic table

Explanation: It kind of represents a graph of the periodic table

8 0
2 years ago
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A chemistry student needs of isopropenylbenzene for an experiment. He has available of a w/w solution of isopropenylbenzene in a
Lera25 [3.4K]

Question:

A chemistry student needs of 10 g isopropenylbenzene for an experiment. He has available 120 g of a 42.7% w/w solution of isopropenylbenzene in acetone. Calculate the mass of solution the student should use. If there's not enough solution, press the "No solution" button.

Answer:

The answer to the question is as follows

The mass of solution the student should use is 23.42 g.

Explanation:

To solve the question we note the following

A solution containing 42.7 % w/w of isopropenylbenzene in acetone  has 42.7 g of isopropenylbenzene in 100 grams of the solution

Therefore we have 10 g of isopropenylbenzene contained in

100 g * 10 g/ 42.7 g = 23.42 g of solution

Available solution = 120 g

Therefore the quantity to used from the available solution = 23.42 g of the isopropenylbenzene in acetone solution.

8 0
3 years ago
If a cell has a nucleus, then it is a
Nadya [2.5K]

Answer:

It is a eukaryotic cell because prokaryotes don't have a nucleus, rather, they have a nucleoid.

5 0
3 years ago
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What do S-shadows tell us about the interior of the earth?
AlekseyPX
<span>S-shadows tells that the earths interior is liquid.</span>
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3 years ago
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