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VARVARA [1.3K]
3 years ago
5

Element Z reacts with calcium to form the ionic compound Caz,? To which group does Z belong? (1) Group 2 (2) Group 13 (3) Group

17 (4) Group 18​
Chemistry
1 answer:
viva [34]3 years ago
6 0

Explanation:

Answer is (3) Group 17.

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What is the percent by mass of sodium in Na2SO4? total mass of element in compound molar mass of compound Use %Element x 100

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Answer:

The answer is the letter A.

Explanation:

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When trying to determine whether or not an atom gives up electrons easily, do chemists look at electronegativity or ionization p
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Here I found some info at Yahoo answers: https://answers.yahoo.com/question/index?qid=20090119191941AAB7oAb
The more electronegative an atom is the more unwilling it is to lose its electrons in a compound. If you do try to take a very EN atom away from a compound you'll need to apply a lot of energy for that to happen. I can give an example of a single atom though 

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If 3.0g of H20 actually forms what is the percentage yield
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Percent yield is expressed as the ratio of the actual yield and the theoretical yield of the reaction multiplied by 100 to get the percent value. The actual yield is usually given in a problem. The theoretical yield is calculated from the reaction. For this problem, it cannot be solved since we cannot obtain the theoretical yield.
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