According to recent research ice skaters are able to glide smoothly across the ice because

Chemistry

1 answer:

Anna11 [10]3 years ago

6 0

Ice is constantly subliming to form a layer of water vapor

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The movement of atoms molecules waves and electrons is

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Energy, I think, haven't done that since 8th grade

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How many grams of kbr must be dissolved to make 25.0 ml of a solution that has a molarity of 0.85 m?

lyudmila [28]

Molarity is defined as the number of moles of solute in 1 L of solution
molarity of solution to be prepared is 0.85 M
this means that there should be 0.85 mol of KBr in 1 L of solution
if 1 L contains - 0.85 mol
then 25.0 mL should contain - 0.85 mol / 1000 mL x 25.0 mL = 0.0213 mol
mass of KBr - 0.0213 mol x 119 g/mol = 2.53 g
mass of KBr that should be dissolved in 25.0 mL is 2.53 g

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2 years ago

Chemical Equations

vagabundo [1.1K]

Answer:

0.712 moles of NO₂ are formed.

Explanation:

First, we need to write the balanced equation:

2 N₂O₅(g) ⇄ 4 NO₂(g) + O₂(g)

From the balanced equation, we can see the relationship between the moles of N₂O₅ and the moles of NO₂. Every 2 moles of N₂O₅ that react, 4 moles of NO₂ are formed. Let us apply this relationship to the information given by the problem (0.356 moles of N₂O₅):

$0.356molN_{2}O_{5}.\frac{4molNO_{2}}{2molN_{2}O_{5}} =0.712molNO_{2}$

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Which elements are metals? check all that apply. rhenium (re) boron (b) lithium (li) krypton (kr) phosphorus (p) mercury (hg)?

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Lithium, mercury, and rhenium are all metals.

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Which is a chacteristic of a solution?

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A solution is a homogeneous mixture of two or more substances. The particles of solute in a solution cannot be seen by the naked eye. A solution does not allow beams of light to scatter.

Explanation:

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3 years ago