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andriy [413]
3 years ago
12

10. A sample of an unknown composition was tested in a laboratory. The sample could not be broken down by

Chemistry
2 answers:
damaskus [11]3 years ago
8 0

Answer:

it would be an element because its an element

Explanation:

vfiekz [6]3 years ago
7 0
It’s element it’s correct
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Which of the following describes the physical state of the layers of the Earth from the outside to the center?
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Solid , solid, partially melted, liquid so the answer is D
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3 years ago
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A student mixes a solution containing 10.0 g bacl2 (m = 208.2) with a solution containing 10.0 g na2so4 (m = 142.1) and obtains
professor190 [17]
The balanced equation for the above reaction is as follows;
Na₂SO₄ + BaCl₂ --> BaSO₄ + 2NaCl
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Number of Na₂SO₄ moles - 10.0 g / 142.1 g/mol = 0.0704 mol
Number of BaCl₂ moles - 10.0 g / 208.2 g/mol = 0.0480 mol
this means that 0.0480 mol of each reactant is used up, BaCl₂ is the limiting reactant and Na₂SO₄ has been provided in excess. 
stoichiometry of BaCl₂ to BaSO₄ is 1:1
number of BaSO₄ moles formed - 0.0480 mol
Mass of BaSO₄ - 0.0480 mol x 233.2 g/mol = 11.2 g
theoretical yield is 11.2 g but the actual yield is 12.0 g
the actual product maybe more than the theoretical yield of the product as the measured mass of the actual yield might contain impurities. 
percent yield - 12.0 g/ 11.2 g x 100% = 107% 
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A non-metallic atom(at.no. 9) forms a molecule of the same,containing a single covalent bond. give reason
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mestny [16]

Answer:

The first person to go to the moon

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Neil Armstrong was the first person !

heres more info on NASAs page!

https://www.nasa.gov/audience/forstudents/k-4/stories/first-person-on-moon.html

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