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2 years ago

How do you distinguish a chemical change from a physical change

Chemistry

1 answer:

kirill [66]2 years ago

7 0

Answer:

One distinguishing feature between physical and chemical changes is that a physical change can be reverse or turn back to its original form, but chemical change cannot be return to its form because the material change.

Explanation:

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8. What was the original concentration in the BHL sample, if the dilution is 1:500 and the concentration 0.07 mg/ml

Yakvenalex [24]

Answer:

The original concentration is "35 mg/ml".

Explanation:

According to the question,

The solution is diluted,

= 1:50

The initial volume,

V1 = 1 ml

Final concentration,

= 0.07 mg

then,

The final volume,

V2 = 500 ml

As we know,

⇒ $V_1N_1=V_2N_2$

or,

⇒ $N_1=\frac{V_2N_2}{V_1}$

On substituting the values, we get

⇒ $=\frac{500\times 0.07}{1}$

⇒ $=\frac{35}{1}$

⇒ $=35 \ mg/ml$

4 0

1 year ago

Please help!!

xxTIMURxx [149]

Answer:

In an experiment, a student transferred 4.50 mL of a liquid into a pre-weighed beaker (the weight of which was determined to be 35.986 g ).

Explanation:

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6 0

2 years ago

Which of these molecules has an overall dipole moment? O A. F2 B. H2S C. CH4 D. CO2

adelina 88 [10]

Answer:

i think the answer is B cus i think of that

4 0

2 years ago

Krispy Kreme Doughnuts decide to donate $10,000 to a classroom for a party how many donuts did they donate in total

shusha [124]

Find out how much the donuts cost then divide that by $10,000 and you will get your answer

5 0

2 years ago

The molecule shown is a

Pani-rosa [81]

c is the answer a benzene

8 0

2 years ago