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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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Which element would be the least similar to magnesium (Mg)?<br> A. Sr<br> B. Na<br> C. Be<br> D. Ca
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B: NA

Explanation:

this is the apex answer

3 0
3 years ago
Conociendo el volumen de la solución y la masa del soluto y su masa molar, ¿qué concentración es posible determinar
NISA [10]

Answer:

Conociendo el volumen de solución, masa de soluto y su masa molar, es posible determinar: B) Concentración molar

La molaridad es la relación entre el número de moles de soluto y los litros de solución. Más:

M = No moles de solución de soluto / volumen (L)

Y a su vez los moles de soluto se encuentran por:

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8 0
3 years ago
Correct scientific term for a substance that is burned to provide heat?
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Fuel......................................
3 0
3 years ago
at a particulat temperature, a smaple of pure water has a Kw of 7.7x10-14. what is the hydroxide concentration of this sample
ycow [4]

Answer: The hydroxide concentration of this sample is 3.85\times 10^{-7}

Explanation:

When an expression is formed by taking the product of concentration of ions raised to the power of their stoichiometric coefficients in the solution of a salt is known as ionic product.

The ionic product for water is written as:

K_w=[H^+]\times [OH^-]

7.7\times 10^{-14}=[H^+]\times [OH^-]

As [H^+]=[OH^-]

2[OH^-]=7.7\times 10^{-14}

[OH^-]=3.85\times 10^{-7}

Thus hydroxide concentration of this sample is 3.85\times 10^{-7}

4 0
2 years ago
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