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Tcecarenko [31]
3 years ago
8

In radioactive materials a parent atom decays into a daughter, such as uranium-238 decaying into lead-206. For some radioisotope

dating methods you have to assume you know the amount of daughter atoms in the crystal, so you can tell how much is a result of radioactive decay (and thus get an age for the rock). Please answer this question: why are zircon crystals so useful for uranium/lead dating? If you don't remember from class, can you read this article.
Chemistry
1 answer:
Lunna [17]3 years ago
7 0

Answer:

In order for scientists to know how old a fossil is they use the process of fossil dating of relative dating. The most common method of dating is the Uranium-lead dating. There are multiple minerals used for uranium-lead dating, the most common/preferred is Zircon. The mineral zircon is ideal because:

  • Zircon is a hard mineral, this makes it impervious to weathering.
  • It is resistant to chemical and mechanical weathering, and metamorphism

Explanation:

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they often use a radon detector to help forecast earthquakes

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Which mineral is hard enough to scratch calcite? *
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Should be number 4, quartz.

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Quartz is rougher than calcite, therefore it's able to scratch it.

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The technology in the picture produces which energy conversion
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The weather in Europe was unusually warm during the summer of 1995. The TV news reported temperatures as high as 45 degree centi
Tpy6a [65]

Answer : The temperature on the Fahrenheit scale was, 113^oF

Explanation :

The conversion used for the temperature from degree centigrade to Fahrenheit is:

^oF=(^oC\times \frac{9}{5})+32

where,

^oF = temperature in Fahrenheit

^oC = temperature in centigrade

As we are given the temperature in degree centigrade is, 45

Now we have to determine the temperature in Fahrenheit.

^oF=(45^oC\times \frac{9}{5})+32

^oF=113

Therefore, the temperature on the Fahrenheit scale was, 113^oF

5 0
4 years ago
Considere la siguiente reacción: H, (g) +1, (a) = 2 HI (9). K, para la reacción es 54.3 a 430°C. Si se coloca H, 0.00623M, 0.004
bearhunter [10]

Answer:

[HI] = 0.0255M

[H₂] = 0.00466M

[I₂] = 0.00257M

Explanation:

Para la reacción:

H₂(g) + I₂(g) ⇄ 2HI(g)

La constante de equilibrio, K, se define como:

54.3 = [HI]² / [H₂] [I₂]

Donde cada concentración [] será la concentración en equilibrio para cada especie

Para saber la dirección del equilibrio definiremos Q como:

Q = [HI]² / [H₂] [I₂]

Donde las concentraciones [] serán las concentraciones actuales de cada gas

Reemplazando:

Q = [0.0224M]² / [0.00623M] [0.00414M]

Q = 19.5

Como Q<K, la reacción se desplazará hacia la derecha produciendo más [HI]. Así, las concentraciones en equilibrio serán:

[HI] = 0.0224M +2X

[H₂] = 0.00623M - X

[I₂] = 0.00414 - X

54.3 = [0.0224M +2X]² / [0.00623M - X] [0.00414M - X]

54.3 = 0.00050176 + 0.0896 X + 4 X² / 0.0000257922 - 0.01037 X + X²

0.00140052 - 0.563091 X + 54.3 X² =  0.00050176 + 0.0896 X + 4 X²

0.00089876 - 0.652691 X + 50.3 X² = 0

Resolviendo la ecuación cuadrática:

X = 0.001566M → Solución verdadera

X = 0.01141M → Falsa solución. Produciría concentraciones negativas

Reemplazando:

[HI] = 0.0224M +2*0.001566M

[H₂] = 0.00623M - 0.001566M

[I₂] = 0.00414 - 0.001566M

[HI] = 0.0255M

[H₂] = 0.00466M

[I₂] = 0.00257M

Siendo estas últimas, las concentraciones de las especies luego de alcanzar el equilibrio.

8 0
3 years ago
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