Explain how an element that does not react easily with other elements can be useful.

1 answer:

5 0

Elements that are unreactive can be useful for 'isolating' other volatile elements. For example, an element may be highly reactive with oxygen, so keeping it in air is not a safe option. In such cases, it may be useful to have a noble gas to store the element safely and ensure its stability. It may also have a purpose in experiments where it may act as a controlling agent or a container for the other reactions.

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What is the percent composition of hydrogen in NH4HCO3?

Readme [11.4K]

To find the Percent Composition of an atom, you use this formula:
Mass of element in the compound you're studying on ( in this case it's 5 since there is 5 Hydrogens) over the mass of the compound (which is here 79), Multiplied by 100 since you want a percent.
So we get:
$\frac{5}{79} * 100$
So you get about:
$0.063 * 100$
$6.3$

So, the percent composition of Hydrogen in NH4HCO3 is 6.3%

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The symbol for the element in period 2, group 13

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Element: Boron
Symbol: B
So answer is B

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