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Aleks04 [339]
3 years ago
8

Silicon Tetrachloride is reacted with very pure magnesium, producing silicon and magnesium chloride. (What would be the unbalanc

ed equation? In other words I'm trying to find pure magnesium's formula.. would it be Mg2? Or just Mg?) I have SiCl4 for Silicon tetrachloride so far..
Is it: SiCl4 + Mg = Si + MgCl2 [unbalanced]?
Balanced: SiCl4 + 2Mg = Si + 2MgCl2 ??
Chemistry
1 answer:
raketka [301]3 years ago
8 0
Pure magnesium's formula would just be Mg because all elements except for 7 nonmetals are just left alone when they are by themselves in a formula. The 7 diatomic elements( means they have to have two of them without another element attached to it aka. a subscript two after it when it's by itself) are hydrogen, nitrogen, oxygen, fluorine, chlorine, bromine, and iodine. An easy way to remember the diatomic seven is that when looking at a periodic table if you trace over them from nitrogen over to fluorine and down to iodine all of those elements are diatomic + hydrogen. 

And your unbalanced and balanced equations are correct.

(sorry I went on a tangent with the diatomic rules hopefully it will help you in the future though) 
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Answer:

B) 2

Explanation:

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The rule apply for the multiplication and division is :

The least number of significant figures in any number of the problem determines the number of significant figures in the answer.

The rule apply for the addition and subtraction is :

The least precise number present after the decimal point determines the number of significant figures in the answer.

(3.478-2.31) = 1.168 ≅ 1.17 (Rounded to least decimal digit)

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3 years ago
How many moles of HCl are present in 4.7 L of a 4.23 M HCl solution?
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Hey There!

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n = M *V

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nordsb [41]
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Answer:  It will take 3 days for half of a 10 g sample to decay.

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