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Mice21 [21]
3 years ago
6

The main reason why water is often referred to as a 'universal solvent' is because:

Chemistry
2 answers:
harina [27]3 years ago
6 0
This helped me for notes so much!!
Dahasolnce [82]3 years ago
3 0
It is the strong hydrogen bonding between molecules. A is the answer
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Disease causing bacteria need oxygen to survive.<br> true or false
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The table shows the amount of radioactive element remaining in a sample over a period of time.
Assoli18 [71]

It would take 147 hours for 320 g of the sample to decay to 2.5 grams from the information provided.

Radioactivity refers to the decay of a nucleus leading to the spontaneous emission of radiation. The half life of a radioactive nucleus refers to the time required for the nucleus to decay to half of its initial amount.

Looking at the table, we can see that the initial mass of radioactive material present is 186 grams, within 21 hours, the radioactive substance decayed to half of its initial mass (93 g). Hence, the half life is 21 hours.

Using the formula;

k = 0.693/t1/2

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Using;

N=Noe^-kt

N = mass of radioactive sample at time t

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k = decay constant

t = time taken

Substituting values;

2.5/320= e^- 0.033 t

0.0078 = e^- 0.033 t

ln (0.0078) = 0.033 t

t = ln (0.0078)/-0.033

t = 147 hours

Learn more: brainly.com/question/6111443

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2 years ago
Why sometimes the electrons of an atom transfer to higher energy level​
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How are cells the basic units to all organisms??
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