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KonstantinChe [14]
3 years ago
7

Which option is an example of a chemical change?

Chemistry
2 answers:
umka21 [38]3 years ago
7 0

Answer:

Fireworks exploding

(yes, i know i'm late UvU )

Katena32 [7]3 years ago
5 0

Answer:

the answer would be  A. fireworks exploding

Explanation:

I TOOOK The test and i got thisone wrong lol so i reviwed what

i got wrong

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How many moles of potassium are contained in 150 g of potassium
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Answer:

150 g of potassium contained 3.8 moles of potassium.

Explanation:

Given data:

Mass of potassium = 150 g

Moles of potassium = ?

Solution:

Number of moles = mass/ molar mass

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Now we will put the values in formula:

Number of moles = mass/ molar mass

Number of moles = 150 g/ 39 g/mol

Number of moles = 3.8 mol

150 g of potassium contained 3.8 moles of potassium.

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4 years ago
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3 years ago
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Compared to the process of extracting lithium from mineral deposits, the process of extracting lithium from evaporation ponds re
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Explanation:

Compared to the process of extracting lithium from mineral deposits, the process of extracting lithium from evaporation ponds requires __less____ water, __less____ money, and ___less________ time.

Lithium extraction from salar brines are more economical to extract compared to extraction from their natural ore deposits. Salar brines occurs as liquid underground brine reservoirs. Once pumped to the surface in ponds, they are left to evaporate and the lithium is concentrated from them. Extraction from brines in ponds do not require water that much, less cost and if the evaporation rate is fast, a lot of time can be saved.

Extraction from mineral deposits require a lot of energy and time to achieve.

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