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lisabon 2012 [21]
3 years ago
10

A rock _____ can get polished from water running over it?

Chemistry
2 answers:
Musya8 [376]3 years ago
6 0

Answer:

The answer is: B

Explanation:

The reason for this is because when a rock is underwater (the river, in this case), the water runs across it non-stop until the rock is removed from the water. The only way it can be polished if it is submerged under the water for quite some time (years and years).

I hope this helped! :))

puteri [66]3 years ago
3 0

Answer:

The answer is B.  A river is a body of water, therefore, there will always be some water running over the rock.

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intrusive igneous rock forms when the cooling of magma takes place fast on the top of the Earth's surface. A. True B. False
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Answer:

A

Explanation:

True igneous rock forms cooling of magma fast on the top

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2 years ago
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The cells that result from the reproductive division of one cell during mitosis or meiosis
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3 years ago
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I need help with these two
bearhunter [10]

Answer:

6. d,  7. a

Explanation:

6. Molarity is a number of moles solute in 1 L solution.

7. 1 L solution - 2.5 mol K2CO3

 20 L             - x mol K2CO3

x  =20*2.5/1 = 50 mol K2CO3

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Actually KCO3 does not exist, in reality it should be K2CO3.

3 0
3 years ago
2 Zn + O2 → 2 ZnO
meriva

Answer:

we need 6.0 moles of zinc (Zn)

Explanation:

Step 1: Data given

Number of moles ZnO produced = 6.0 moles

Step 2: The balanced equation

2 Zn + O2 → 2 ZnO

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For 6.0 moles 2nO produced, we need 6.0 moles of zinc (Zn) and 3.0 moles of O2 to react.

3 0
3 years ago
The number of atoms or molecules in a mole is known as the __________ constant.
AnnZ [28]

Answer: Avogrado's Constant

Explanation:

One mole of a substance is equal to 6.022 × 10²³ units of that substance (such as atoms, molecules, or ions). The number 6.022 × 10²³ is known as Avogadro's number or Avogadro's constant. The concept of the mole can be used to convert between mass and number of particles.

7 0
3 years ago
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