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Andre45 [30]
4 years ago
14

In the early studies of chemistry, scientists used properties and changed to help identify compounds. this is still done today.

if you were given the following observation about salt water, how would you classify it? "when electricity flows through a flask of salt water, bubbles form in the water. these bubbles, when collected, will burn."
Chemistry
1 answer:
aalyn [17]4 years ago
4 0

Answer:

as an inflammable substance

Explanation:

Because when it reacts with electricity and water start to produce bubbles, and these bubbles burn, that mean is a substance flammable.

Now a days it is needed to have more test to identify a substance and to classify not just by the physical properties, also by the chemical properties and even  more, by the chemical behavior in front of other substances.

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3 0
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Harman [31]

Answer:

54 days

Explanation:

We have to use the formula;

0.693/t1/2 =2.303/t log Ao/A

Where;

t1/2= half-life of phosphorus-32= 14.3 days

t= time taken for the activity to fall to 7.34% of its original value

Ao=initial activity of phosphorus-32

A= activity of phosphorus-32 after a time t

Note that;

A=0.0734Ao (the activity of the sample decreased to 7.34% of the activity of the original sample)

Substituting values;

0.693/14.3 = 2.303/t log Ao/0.0734Ao

0.693/14.3 = 2.303/t log 1/0.0734

0.693/14.3 = 2.6/t

0.048=2.6/t

t= 2.6/0.048

t= 54 days

3 0
3 years ago
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Explanation:

Hope this helps you answer this question!

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