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3 years ago

An element is?

Chemistry

2 answers:

Sidana [21]3 years ago

4 0

i think it’s D , not sure though

Maru [420]3 years ago

4 0

Answer:

b;bbbbbbbbbbbbbbbbbb

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Calculate the molality of a solution that contains 51.2 g of naphthalene, C10H8, in 500 mL of carbon tetrachloride. The density

PtichkaEL [24]

Answer: The molality of naphthalene solution is 0.499 m

Explanation:

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

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

Given values:

Volume of carbon tetrachloride = 500 mL

Density of carbon tetrachloride = 1.60 g/mL

Putting values in equation 1, we get:

$\text{Mass of carbon tetrachloride}=(1.60g/mL\times 500mL)=800g$

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

Molar mass of naphthalene = 128.17 g/mol

Mass of solvent = 800 g

Putting values in equation 2, we get:

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

Hence, the molality of naphthalene solution is 0.499 m

4 0

2 years ago

The ____ can be described as the basic unit of life. (2 points) atom neutron cell nucleus

Verizon [17]

Answer:

the cell can be the described as the basic unit of life

8 0

3 years ago

Read 2 more answers

Given the molecular formula, C9H13N, the correct empirical formula is

Lesechka [4]

Answer:

C9H13N

Explanation:

Since there is no common factor besides 1, the formula is already the empirical formula for this compound.

7 0

3 years ago

Write this number in standard notation. 1.986 x 10negative exponent 6 or 1.986 x 10^6

Brums [2.3K]

Answer:

$0.000001986$

Explanation:

We have the number $1.986*10^{-6}$ . Standard notation would basically be this number without the $10^{-6}$ part.

To get rid of this part, we need to move the decimal point 6 places to the left (we go left because it's negative 6, indicating division).

So, when we move the decimal point 6 places to the left, the resulting number is: $0.000001986$ , with 5 zeros after the decimal point before a nonzero number.

Thus, the answer is $0.000001986$ .

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3 years ago

Would the hardness of a mineral affect its performance in the streak test why or why not

insens350 [35]

It would because diamonds are the hardest minerals and they do not streak unless it is on another diamond.

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3 years ago