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Umnica [9.8K]
2 years ago
5

Please answer fast please ​

Chemistry
1 answer:
slega [8]2 years ago
4 0

I don't know which one I should answer

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How does the number of valence electrons for elements change across a period?
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D. The number increases and then decreases for noble gases
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If the length of a string increases 2 times but the mass of the string remains constant, the new density of the string will equa
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If the length of a string increases 2 times but the mass of the string remains constant, the original density  will be multiplied by a factor  mathematically given as

v=1.414 times

<h3>Will the new density of the string equal the original density multiplied by what factor?</h3>

Generally, the equation for the  volume is mathematically given as

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What can be formed by atoms of same element (H) or atoms of different 20 points<br> elements (CO)? *
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3 years ago
Evaluate the method of separation to be used.<br>1. Stones and rice (for cooking)​
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How many moles of nitrogen gas will occupy a volume of .5L at 1.0atm and 298K
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 <span>Use the Ideal law Equation :

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<span>n = R*T/P*V 

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1.0 * 0.5 = n *<span>0.0821*298

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n =0.0204 moles


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