Add a spoonful of sugar to one cup of water. Add a spoonful of
oil to a second cup of water. Stir
each cup. Record your
observations below.

The sugar will dissolve in water.

The oil will float in water.

Explanation:

The sugar molecules will fill up the remaining space between the molecules of water.

The oil being lighter and less denser than water floats in the water.

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number of molecules / avogadro's number * molecule molecular = mass

explanation:

we define a gram-molecular weight as the mass of one mole of any element or compound. a mole contains avogadro's number of units (molecules) –  

6.022

x

10

23

. so, dividing the number of molecules by avogadro's number gives us the number of moles. multiplying that by the molecular weight gives us the mass. from the periodic table we find the gram-molecular weight of u to be238 and of f to be19. so,  

u

f

6

will have a gram-molecular weight of 352g.

answer:

technetium is the most reactive. this is followed by silver. the least reactive out of these three elements is strontium.