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iVinArrow [24]
3 years ago
12

An atom’s lewis dot structure has two dots, which element could it be, and why?

Chemistry
1 answer:
Neko [114]3 years ago
5 0
It could be any of the alkaline metals or helium as they all have 2 valence electrons.
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Answer:

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138 mg

Explanation:

A company is testing drinking water and wants to ensure that Ca content is below 155 ppm (= 155 mg/kg), that is, <em>155 milligrams of calcium per kilogram of drinking water</em>. We need to find the maximum amount of calcium in 890 g of drinking water.

Step 1: Convert the mass of drinking water to kilograms.

We will use the relation 1 kg = 1000 g.

890g \times \frac{1kg}{1000g} =0.890kg

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0.890gH_2O \times \frac{155mgCa}{1kgH_2O} = 138mgCa

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A forensic scientist matches a suspect's fingerprint on a drinking glass found in a robbery victim's apartment. What type of ana
Usimov [2.4K]
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C) The scientist made an identification

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The fingerprint is a very certain method for identifying a person, because all human beings have got unique fingerprints. Forensic laboratories have database of all citizens in the area. Hence an identification is done by the results matched with the database information. The two main categories of fingerprint matching techniques are minutiae-based matching and pattern matching and both are them are present in the given database.

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If eggs are so fragile, how do they actually protect the growing bird?​
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