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3 years ago

I need some help please

Chemistry

1 answer:

Norma-Jean [14]3 years ago

5 0

Answer:

the first one to the third box

the second one to the fourth box

the third one to second box

and the fourth one to the first box

Explanation:

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Materials with air pockets that decrease their density and prevent energy transfer are called:

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D. compressors because it decreases density and compresses it. that makes it prevent energy transfer

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3 years ago

Enter your answer in the provided box. an aqueous solution containing 10 g of an optically pure substance was diluted to 500 ml

sladkih [1.3K]

Answer:

[α] = -77.5° / $\frac{\textup{dm-g}}{\textup{mL}}$

Explanation:

Given;

Mass of optically pure substance in the solution = 10 g

Volume of water = 500 mL

Length of the polarimeter, l = 20 cm = 20 × 0.1 dm = 2 dm

measured rotation = - 3.10°

Now,

The specific rotation ( [α] ) is given as:

[α] = $\frac{\alpha}{c\times l}$

here,

α is the measured rotation = -3.10°

c is the concentration

c = $\frac{\textup{Mass of optically pure substance in the solution}}{\textup{Volume of water}}$

c = $\frac{10}{500}$

c = 0.02 g/mL

on substituting the values, we get

[α] = $\frac{-3.10^o}{0.02\times2}$

[α] = -77.5° / $\frac{\textup{dm-g}}{\textup{mL}}$

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Juliette [100K]

Answer:

Nuclear reaction takes place at the nucleus whereas chemical reaction involves valence electrons

Explanation:

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-Asmaa Ghazzawi

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Which statement holds true when the molar mass of hydrogen is 2.0 grams and that of helium is 4.0 grams?

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3 years ago