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nordsb [41]
3 years ago
10

Check the boxes next to events or trends that first occurred in science from about 1700. Darwin published his theory of natural

selection. Archimedes described the principle of the lever. Scientific societies and academies were formed. The double-helix structure of DNA was determined. Copernicus proposed a Sun-centered universe. Continental drift was explained by the theory of plate tectonics. The Earth was proven to be spherical.
Chemistry
2 answers:
pantera1 [17]3 years ago
8 0

Darwin published his theory of natural selection

Scientific societies and academies were formed.

The double-helix structure of DNA was determined.

Continental drift was explained by the theory of plate tectonics

got it right

marishachu [46]3 years ago
4 0

Check the boxes next to events or trends that first occurred in science from about 1700.

X Darwin published his theory of natural selection.

-Darwin published his work in 1859.

X Archimedes described the principle of the lever.

-Archimedes discovered this during the third century BC (300-201 BC)

/ Scientific societies and academies were formed.

-These were formed around 1789

X The double-helix structure of DNA was determined.

<span> -IT was discovered in 1953 by James Watson and Francis Crick.</span>

X Copernicus proposed a Sun-centered universe.

<span>-It was proposed in the 16th century.</span>

X Continental drift was explained by the theory of plate tectonics.

<span> -It was proposed at around 1910 till 1950 but was accepted at 1960. </span>

X The Earth was proven to be spherical.

-It was argued at around 384-322 BC.

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<u>Answer:</u> The molality of naphthalene solution is 0.499 m

<u>Explanation:</u>

Density is defined as the ratio of mass and volume of a substance.

\text{Density}=\frac{\text{Mass}}{\text{Volume}} ......(1)

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Volume of carbon tetrachloride = 500 mL

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Putting values in equation 1, we get:

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Molality is defined as the amount of solute expressed in the number of moles present per kilogram of solvent. The units of molarity are mol/kg. The formula used to calculate molarity:

\text{Molality of solution}=\frac{\text{Given mass of solute}\times 1000}{\text{Molar mass of solute}\times \text{Mass of solvent (in g)}} .....(2)

Given values:

Given mass of naphthalene = 51.2 g

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Putting values in equation 2, we get:

\text{Molality of naphthalene}=\frac{51.2\times 1000}{128.17\times 800}\\\\\text{Molality of naphthalene}=0.499m

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