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2 years ago

Which body system provides protection of the brain and the spinal cord?

Chemistry

2 answers:

gogolik [260]2 years ago

8 0

Answer:

The bones of the skull and spinal column

Explanation:

The central nervous system is better protected than any other system or organ in the body. Its main line of defense is the bones of the skull and spinal column, which create a hard physical barrier to injury.

Lerok [7]2 years ago

5 0

Answer:

The Central Nervous System (CNS)

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chemistry student needs of thiophene for an experiment. She has available of a w/w solution of thiophene in carbon tetrachloride

kumpel [21]

The question is incomplete, here is the complete question:

A chemistry student needs 75 g of thiophene foran experiment. He has available 0.50 kg of a 29.3% w/w solution of thiophene in carbon tetrachloride.

Calculate the mass of solution the student should use. If there's not enough solution, press the "No solution" button.

<u>Answer:</u> The mass of solution the student should use is 255.97 grams

<u>Explanation:</u>

We are given:

Mass of thiophene needed = 75 gram

29.3 % w/w thiophene solution

This means that 29.3 grams of thiophene is present in 100 grams of solution

Applying unitary method:

If 29.3 grams of thiophene is present in 100 grams of solution

So, 75 grams of thiophene will be present in = $\frac{100}{29.3}\times 75=255.97g$

Given amount of solution = 0.50 kg = 500 grams (Conversion factor: 1 kg = 1000 g)

Hence, the mass of solution the student should use is 255.97 grams

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3 years ago

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