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laila [671]
2 years ago
6

Elements that are usually dull, brittle and do not conduct electricity are know as______.

Chemistry
1 answer:
Anton [14]2 years ago
8 0

Answer:

nonmetal

Explanation:

.........

...

.

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Salt in crude oil must be removed before the oil undergoes processing in a refinery. The
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Answer:

\large \boxed{0.64 \, \%}

Explanation:

Assume you are using 1 L of water.

Then you are washing 4 L of salty oil.

1. Calculate the mass of the salty oil

Assume the oil has a density of 0.86 g/mL.

\text{Mass of oil} = \text{4000 mL} \times \dfrac{\text{0.86 g}}{\text{1 mL}} = \text{3440 g}

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4. Mass of salt remaining in washed oil

Mass = 172 g - 150 g = 22 g  

5. Concentration of salt in washed oil

\text{Concentration} = \dfrac{\text{22 g}}{\text{3440 g}} \times 100 \, \% = \mathbf{0.64 \, \%}\\\\\text{The concentration of salt in the washed oil is $\large \boxed{\mathbf{0.64 \, \%}}$}

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3 years ago
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