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3 years ago

Subsurface mining disturbs more land than surface mining true or false

Chemistry

1 answer:

Allisa [31]3 years ago

5 0

Answer:

False

Explanation:

Surface mining disturbs more land compared to subsurface mines.

During surface mining, huge mounds of earth is removed inorder to access mineral deposits. The deeper lying the deposit, the more the earth is removed and disturbed.

In subsurface mines, tunnels and a system of shaft are used to access the ore body. Data about the geometry and positioning of the ore helps to plan how to effectively access it.

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0.5 kg or 0.5 lb which is a larger quantity

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The correct answer is 0.5 kg If you whant me to explaine pls tell me

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3 years ago

when solid pellets of sodium hydroxide (naoh) dissolve in water, the temperature of the water can rise dramatically. taking naoh

irga5000 [103]

ΔSsys and ΔSsurr both have values larger than 0.

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Heat transport (delta Q) divided by temperature equals the change in entropy (delta S).

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1 year ago

¿Que ocurre cuando alteramos la temperatura de una disolución?

Gelneren [198K]

Answer: Explanation:

Temperatura. La solubilidad de un soluto en un determinado solvente principalmente depende de la temperatura. Para muchos sólidos disueltos en el agua líquida, la solubilidad aumenta con la temperatura hasta 100 °C, aunque existen casos que presentan un comportamiento inverso.

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3 years ago

What substance would you add to KF(aq) to form a buffer solution? View Available Hint(s) What substance would you add to to form

AnnyKZ [126]

<h3>Answer</h3>

<h3>Explanation</h3>

A buffer solution contains <em>a weak acid</em> and<em> its conjugate base</em>. The two species shall have a similar concentration in the solution. It's also possible for <em>a weak base</em> and <em>its conjugate acid</em> to form a buffer solution.

The KF solution already contains large number of $\text{F}^{-}$ ions. The objective is to thus find its conjugate acid or base.

$\text{F}^{-}$ contains no proton $\text{H}^{+}$ and is unlikely to be a conjugate acid. Assuming that $\text{F}^{-}$ is a conjugate base. Adding one proton to $\text{F}^{-}$ would produce its conjugate acid.

$\text{H}^{+} \; (aq) + \text{F}^{-} \; (aq) \rightleftharpoons \text{HF}\; (aq)$

Therefore $\text{HF}$ is the conjugate acid of $\text{F}^{-}$ . $\text{HF}$ happens to be a weak acid. As a result, combining $\text{F}^{-}$ with $\text{HF}$ would produce a solution with large number of both the weak acid and its conjugate base, which is a buffer solution by definition.

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3 years ago

A rock weighing 15.0g is placed in a graduated cylinder, displacing the volume from 25.0 mL to 36.2 mL. What is the density of t

valina [46]

Density is defined as mass/volume, and the volume is 36.2-25 mL
so just substitute into the equation to get the answer.

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3 years ago

Read 2 more answers