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avanturin [10]
3 years ago
10

While exploring an ancient lava field, a geologist discovers a piece of granite that has a coating of soft, crumbling rust. What

is the most likely explanation for this rust?
A.
Exposure to air has caused the iron-bearing minerals in the granite to oxidize.
B.
At some point in the past, a river flowed over the field, depositing the rust on top of the granite.
C.
Exposure to acid precipitation has worn away the granite's exterior, revealing its soft interior.
D.
Snails and fungi living in the lava field have secreted chemicals that reacted with the granite to form rust.
Chemistry
1 answer:
Yuliya22 [10]3 years ago
6 0

Answer:

A. Exposure to air has caused the iron-bearing minerals in the granite to oxidize.

Explanation:

The main cause of granite rust is a metal substance that remains in it's contact over a long period of time. As a result of a moist or wet environment, . a geologist discovers a piece of granite that has a coating of soft, crumbling rust.

Exposure to air has caused the iron-bearing minerals in the granite to oxidize.

Option A. is correct.

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Answer:

it would burn

Explanation:

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2 years ago
a man bought two watches for Rs 2500 each.He sold one of them at 10% . profit and the other at 4% loss.what was his gain or loss
timofeeve [1]

Answer:

Selling price of watch A and watch B= Rs. 425

Let cost price of watch A=x

Profit =10%

∴

100

110

x=425

x=386.36

Let cost price of watch B=y

Loss =10%

∴

100

90

y=425

y=472.22

Net cost price =x+y=858.5858

Net selling price =850

Loss%=

858.58

858.5858−850

×100=1%

Explanation:

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5 0
3 years ago
Write balanced chemical equations for the two gas producing chemical reactions
Travka [436]
CaCO3 <span>→</span> CaO + CO<span>2   

</span>H2CO3 →<span> H</span>2O<span> + CO</span>2<span>



</span>
4 0
3 years ago
Which solution will form a precipitate when mixed with a solution of aqueous na2co3? which solution will form a precipitate when
trapecia [35]

Answer:

CuCl_{2}(aq.) will form a precipitate of insoluble CuCO_{3} when aqueous Na_{2}CO_{3} is added.

Explanation:

According to solubility rule-

all carbonates are insoluble except group IA compounds and NH_{4}^{+}

all salts of sodium are soluble

When Na_{2}CO_{3} is added to given solutions, a double displacement reaction takes place in each solution to form a sodium salt and a carbonate salt.

So, in accordance with solubility rule, addition of Na_{2}CO_{3} into CuCl_{2}(aq.) will result precipitation of insoluble CuCO_{3}

Reaction: Na_{2}CO_{3}(aq.)+CuCl_{2}(aq.)\rightarrow 2NaCl(aq.)+CuCO_{3}(aq.)

4 0
3 years ago
What is the mass percent of oxygen in Nickel (III) sulfate?
NeX [460]

The mass percent of oxygen in Nickel(III)sulfate is 23.68 percent.

At first, we look up the atomic masses for the element from the periodic table.

The atomic masses are found to be:

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  • S is 32
  • O is 16

Next, we determine how many grams of each element are present in one mole of Ni_{2}(SO_{4})_{3}

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  • 96g(3 mol*32) of S
  • 192g(12 mol * 16.00) of O

The mass of one mole  Ni_{2}(SO_{4})_{3} is:

117.4g+96g+192g=405.4g

So, The mass percent of oxygen =(96g/405.4)*100=0.2368*100%\\

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To learn more about Mass percent, refer to:

  • brainly.com/question/25255030

3 0
2 years ago
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