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mel-nik [20]
3 years ago
7

Why are only some minerals found as native minerals? For example, iron and aluminum are almost never found as native elements in

nature.
Chemistry
1 answer:
Keith_Richards [23]3 years ago
7 0

Answer: Metals found as native minerals in nature are not highly reactive

Explanation:

Native minerals refers to minerals that are found in nature in their pure metallic form such as gold. Iron and aluminum are highly reactive metals. Highly reactive metals are far up in the activity series of metals, they have a great tendency towards oxidation. On the other hand, noble metals have less tendency towards oxidation and are found close to the bottom of the activity series for example, gold.

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You are counting red blood cells, which objective will be best to count the number of cells, high power or low power objective a
BARSIC [14]

Answer:

Low power

Explanation:

Low power would allow for the full image of the red blood cells and would appear as small circles.

4 0
3 years ago
Which of the following most likely happens during a physical change?
alexandr1967 [171]

The correct answer is B.

4 0
3 years ago
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Explain this method (Froth floatation method)..........​
Svetach [21]

Answer:

froth flotation is a technique commonly used in the mining industry. In this technique, particles of interest are physically separated from a liquid phase as a result of differences in the ability of air bubbles to selectively adhere to the surface of the particles, based upon their hydrophobicity.

Explanation:

Froth floatation method is commonly used to concentrate sulphide ore such as galena (PbS), zinc blende (ZnS) etc. (ii) In this method, the metaalic ore particles which are perferentially wetted by oil can be separated from gangue. (iii) In this method, the crushed ore is suspended in water and mixed with frothing agent such as pine oil, eucalyptus oil etc. (iv) A small quantity of sodium ethyl xanthate which act as a collector is also added. (v) A froth is generated by blowing air through this mixture. (vi) The collector molecules attach to the ore particles and make them water repellent. (vii) As a result, ore parrticles, wetted by the oil, rise to the surface along with the froth. (viii) The froth is skimmed off and dried to recover the concentration ore. (ix) The gangue particles that are preferentially wetted by water settle at the bottom.

3 0
2 years ago
Convert 3.30 g of copper (II) hydroxide Cu(OH)2 to molecules.
ratelena [41]

Answer:

0.18× 10²³ molecules

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Given data:

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Number of moles = 3.30 g/97.56 g/mol

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Avogadro number:

The given problem will solve by using Avogadro number.

It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.  The number 6.022 × 10²³ is called Avogadro number.

1 mole = 6.022 × 10²³ molecules

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0.18× 10²³ molecules

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Muscles work in _____ so when other muscles contract the other ___
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The first word could be: pairs and the second: relax
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