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dezoksy [38]
3 years ago
5

Carbon-14 is the typical radioisotope used to date materials; however it has limitation to 40000 years a scientist who wants to

date materials older than 40000 years would most likely use
A. Uranium- 238
B. Rubidium- 91
C. Iodine- 131
D. Cobalt- 60
Chemistry
1 answer:
ycow [4]3 years ago
6 0

Answer:

The answer would be Uranium-238

Explanation:

It's the only one that lasts longer than 40,000 years

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How many ions form when 39 grams of calcium fluoride are added to excess water? a. 0.50 mol b. 1.0 mol c. 1.5 mol d. 3.0 mol
agasfer [191]

Answer:

c. 1.5 mol

Explanation:

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n = mass / molar mass = (39.0 g) / (78.07 g/mol) = 0.499 mol ≅ 0.5 mol.

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Every 0.1 mole of CaF₂ is ionized to 3 ions (1 ion of Ca⁺² and 2 ions of F⁻).

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Thus, the right choice is "c. 1.5 mol".

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3 years ago
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How is a solute different from a solvent in a solution?
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A solution<span> is basically two substances that are mixed together.</span><span>. A </span>solute<span> is the substance to be dissolved (sugar). The </span>solvent<span> is the one doing the dissolving (water)     Hoped i helped :D</span>
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