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Julli [10]
2 years ago
7

Which TWO observations are evidence that a chemical change is happening?

Chemistry
1 answer:
Kryger [21]2 years ago
7 0

Answer: it is B and D light

Explanation: when a spark happens that is changing and bubbles is also changing

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These help in making the liquid boil more easily

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Among the alkali earth metals, the tendency to react with other substances
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Answer: option <span>A) increases from bottom to top within the group.

Explanation:

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3 years ago
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10mL volume of 75mM EtOH is necessary for an experiment. What volumes of 1M EtOH and water should be mixed to obtain the working
kenny6666 [7]

Answer: Volume of the 1M EtOH and water should be 0.75 ml and 9.25 ml respectively to obtain the working concentration.

Explanation:

According to the dilution law,

C_1V_1=C_2V_2

where,

C_1 = molarity of stock solution = 1M

V_1 = volume of stock solution = ?

C_2 = molarity of diluted solution = 0.075 M    (1mM=0.001M)

V_2 = volume of diluted solution = 10 ml

Putting in the values we get:

1M\times V_1=0.075M\times 10ml

V_1=0.75ml

Thus 0.75 ml of 1M EtOH is taken and (10-0.75)ml = 9.25 ml of water is added to make the volume 10ml.

Therefore, volume of the 1M EtOH and water should be 0.75 ml and 9.25 ml respectively to obtain the working concentration

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