3 years ago

What is one bad thing that can happen when humans build more and more streets and buildings?

Chemistry

1 answer:

Irina18 [472]3 years ago

4 0

Answer:

there will be less and less space

Explanation:

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A mixture of two compounds, A and B, was separated by extraction. After the compounds were dried, their masses were found to be:

Arlecino [84]

Answer:

The percent recovery from re crystallization for both compounds A and B is 69.745 and 81.44 % respectively.

Explanation:

Mass of compound A in a mixture = 119 mg

Mass of compound A after re-crystallization = 83 mg

Percent recovery from re-crystallization :

$\frac{\text{Mass after re-crystallization}}{\text{Mass before re-crystallization}}\times 100$

Percent recovery of compound A:

$\frac{83 mg}{119 mg}\times 100=69.74\%$

Mass of compound B in a mixture = 97 mg

Mass of compound B after re-crystallization = 79 mg

Percent recovery of compound B:

$\frac{79 mg}{97 mg}\times 100=81.44\%$

3 0

3 years ago

Glass of orange juice contain 0.90 dL of juice. How many milliliters of orange juice is that?

dlinn [17]

.90 dL is 90 mL because 1 dL is 100 mL

6 0

3 years ago

If the molar mass of NaCl is 58.44 g/mol, what amount of NaCl (in mol) is contained in 250.0 mg of NaCl?

4vir4ik [10]

Answer: 0.004 moles

Explanation:

Amount of substance= mass/ molar mass

Mass= 250mg or 0.25g

Molar mass= 58.44gmol-1

Amount= 0.25/58.44

= 0.004 moles

5 0

3 years ago

jane starts to blink her eyes when her brother shines a flashlight at her. why does jane start blinking her eyes

Ivanshal [37]

There is too much light entering her eyes.

3 0

3 years ago

Why Aluminium Oxide has higher melting point than Alumunium Chloride? Try to mentioned about ionic compound.

Sidana [21]

Answer:

Aluminium oxide has higher melting point than aluminium chloride because there nay be some impurities in the oxide which affects the intermolecular force of attraction

4 0

4 years ago