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Aleks04 [339]
2 years ago
9

Do you use sig figs in percent errors??

Chemistry
1 answer:
leonid [27]2 years ago
3 0

Answer:

I think you use sig figs in percent error.

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PLEASE HELP ME :)
KiRa [710]

Answer:

Ice melting is a physical change. Physical changes are changes which affect the form of a chemical substance, but not its chemical composition. Certain factors, such as, temperature, contribute to the melting of ice, but it will be classified as a physical change, because the number of molecules present in the water does not change.  

Explanation:

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3 years ago
A mineral sample is obtained from a region of the country that has high arsenic contamination. An elemental analysis yields the
Gnesinka [82]

Answer:

<em><u>CaAsHO₄</u></em>

Explanation:

The data has a mistake in one of the values there. I believe the mistake is on the hydrogen. So, I'm going to assume the value of Hydrogen is 0.6%, so the total percent composition would be 100.1% (Something better). All you have to do is replace the correct value of H (or the value with the mistaken option) and do the same procedure.

Now, to calculate the empirical formula, we can do this in three steps.

<u>Step 1. Calculate the amount in moles of each element.</u>

In these case, we just divide the percent composition with the molar mass of each one of them:

Ca: 22.3 / 40.078 = 0.5564

As: 41.6 / 74.9216 = 0.5552

O: 35.6 / 15.9994 = 2.2251

H: 0.6 / 1.00794 = 0.5953

Now that we have done this, let's calculate the ratio of mole of each of them. This is doing dividing the smallest number of mole between each of the moles there. In this case, the moles of As are the smallest so:

Ca: 0.5564/0.5552 = 1.0022

As: 0.5552/0.5552 = 1

O: 2.2251/0.5552 = 4.0077

H: 0.5953/0.5552 = 1.0722

Now, we round those numbers, and that will give us the number of atoms of each element in the empirical formula

<u>Step 3. Write the empirical formula with the rounded numbers obtained</u>

In this case we will have:

Ca: 1

As: 1

O: 4

H: 1

The empirical formula would have to be:

<em><u>CaAsHO₄</u></em>

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3 years ago
Atomic mass unit is calculated with reference to
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An atomic mass unit is defined as a mass equal to one twelfth the mass of an atom of carbon-12. The mass of any isotope of any element is expressed in relation to the carbon-12 standard. For example, one atom of helium-4 has a mass of 4.0026 amu. An atom of sulfur-32 has a mass of 31.972 amu.
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They can grow fungus and they emit carbon
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What is the main factor that prevents the growth of tropical plants in the northern part of the us
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Extreme weather e.g. snow and cold weather. Another main contributing factor is that many places have a long dry season.
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