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Makovka662 [10]
3 years ago
7

What would be good types of info to put in a timeline

Chemistry
1 answer:
Goryan [66]3 years ago
4 0
Special dates and important events
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Th correct answer is A
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Calculate the concentration imports per million ppm of DDT if a sample size of 5000 g contained 0.10 g DDT
nevsk [136]

Answer:

20ppm

Explanation:

parts per million are defined as the mass of solute in mg (In this case, mass of DDT) per kg of sample.

To solve this question we must find the mass of DDT in mg and the mass of sample in kg:

<em>Mass DDT:</em>

0.10g * (1000mg / 1g) = 100mg

<em>Mass sample:</em>

5000g * (1kg / 1000g) = 5kg

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3 0
2 years ago
Which element in period 3 has three times the electronegativity value compared to that of li in period 2
victus00 [196]

Answer:

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According to periodic trends, the electro negativity values are expected to increase across the period up to fluorine. Hence, as we go right wards, we encounter elements with higher electronegative values.

While lithium has an electronegative value of 1 , the electronegative value of element nitrogen is thrrr times this which is equal to three

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3 years ago
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