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Mariulka [41]
3 years ago
6

Of the three metals pb cu zn which is the most active

Chemistry
1 answer:
Paladinen [302]3 years ago
6 0
Zn is the most active of the three metals.
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What is a common form for synthesis reactions?
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Answer:

The Best Answer would be B but the correct answer is A+B --> AB

Explanation:

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Solar, wind, and water power are renewable resources and can replace our dependence on fossil fuels. They each have their own dr
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4 years ago
What is the percent composition by mass of oxygen in Ca(NO3)2 (gram-formula= 164 g/mol)?
Neko [114]
To find this, we will use this formula:

Molar mass of element
------------------------------------ x 100
Molar mass of compound

So, first lets calculate the mass of the compound as a whole. We use the atomic masses on the periodic table to determine this.

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N2 (there is two nitrogens): 28.014 g/mol
O6 (there are six nitrogens: 3 times 2): 95.994 g/mol

When we add all of those numbers up together, we get 164.086. That is the molar mass for the whole compound. However, we are trying to figure out what percent of the compound oxygen makes up. From the molar mass, we know that 95.994 of the 164.086 is oxygen. Lets plug those numbers into our equation!

95.994
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164.086

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So, the percent compostition of oxygen in Ca(NO3)2, or, calcium nitrate, is 58.5%.
5 0
3 years ago
If the valency of oxygen is 2, derive the valencies of the other elements present in the following oxides. Na2O, ZnO , Al2O3 , M
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Answer:

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let the valency of Na is x

2(x)+(2)=0

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let the valency of Al is x

2(x)+3(2)=0

2x+6=0

2x=-6

x=-3

4)MgO

let the valency of Mg is x

x+2=0

x=-2

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3 years ago
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