3 years ago

Question 3 Unsaved

Chemistry

1 answer:

VMariaS [17]3 years ago

6 0

Hi Khal75,

Experiment: How to seperate sand.

Answer - separated using a filter; not soluble in water

Sand is not soluble in water. If you heat it all the water will dissolve but the sand will not.

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The reactants of two chemical equations are listed.

hjlf

The correct answer is b

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2 years ago

Write the position of metals, non - metals and metalloids in the periodic table.

Nostrana [21]

Answer:

The metals are to the left of the line (except for hydrogen, which is a nonmetal), the nonmetals are to the right of the line, and the elements immediately adjacent to the line are the metalloids.

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3 years ago

A sample of Francium-212 will decay to one sixteenth of its original amount after 80 minutes. What is the half-life of Francium-

lbvjy [14]

20 minutes.

The sample would lose one half the quantity of francium in each half-life.

$1/16 = 1/2^{4} = 1/2 \times1/2 \times1/2 \times1/2$

Thus a mass decrease by a factor of 16 would correspond to a period of four half-lives. It took 80 minutes for the sample to lose all these francium, therefore

$t_{1/2} = 80/4 = 20$ minutes.