3 years ago

An atom with an atomic number of 12 and a mass number of 25 can best be described by which of these?

Chemistry

1 answer:

iren2701 [21]3 years ago

4 0

A is the correct answer

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Describe how water is a destructive force to land features on the surface of the Earth and provide at least three examples. Desc

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flooding and land erosion

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3 years ago

How would you obtain pure sugar from a mixture of sugar, charcoal, and copper?

beks73 [17]

Pure sugar can be obtained from sugar solution by the process of crystallization. It involves heating which leads to evaporation of water to make the solution saturated. The saturated solution when left undisturbed convert to pure crystals of the sugar.

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1 year ago

Which of the following represents the least number of molecues?

Mars2501 [29]

Answer:

Answer: a) 20g of H2O (18.02 g/mol) molecules=6.68x10^23

Explanation:

In order to find the amount of molecules of each of the options, we need to follow the following equation.

$molecules=\frac{mass(g)x6.022x10^{23}(molecules/mol) }{atomic weight(g/mol)}$

So, let´s get the number of molecules for each of the options.

$a) molecules=\frac{20(g)x6.022x10^{23}(molecules/mol) }{18.02(g/mol)}=6.68x10^{23}molecules$

$b) molecules=\frac{77(g)x6.022x10^{23}(molecules/mol) }{16.06(g/mol)}=2.89x10^{24}molecules$

$c) molecules=\frac{68(g)x6.022x10^{23}(molecules/mol) }{42.09(g/mol)}=9.73x10^{23}molecules$

$d) molecules=\frac{100(g)x6.022x10^{23}(molecules/mol) }{44.02(g/mol)}=1.37x10^{24}molecules$

$d) molecules=\frac{84(g)x6.022x10^{23}(molecules/mol) }{20.01(g/mol)}=2.53x10^{24}molecules$

the smalest number is in option a)

Best of luck.

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3 years ago

Which one is an expression of distance in Sl units?

Svetllana [295]

Answer:

500 meters

Explanation:

____________________

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3 years ago

Read 2 more answers

If you repeat an experiment and the result are very different from the result you got the first time the next step would be to w

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You would want to make sure that you have controlled the variables properly, and if you determine that you did then you would repeat the experiment to be sure of the results.

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3 years ago