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beks73 [17]
3 years ago
11

You happen to be visiting Northem California and you are driving by Suisun Bay, a notorious graveyard for old ships You notice t

hat all of these ships appear to be nusting may Which of the following statements is true? View Available Hint(s The rusting of the metal is neither a chemical change nor a physical change O The rusting of the metal is a chemical change o The rusting of the metal is both a chemical change and a physical change The rusting of the metal is a physical change Submit the Part B Black ice is a thin layer of water on a sidewalk or road that has rozen after the temperature has dropped below freezing its called black ice because the ice-s nearly ms ble especially when driving in a car at night. Which of the following statements is true? >View Available Hint(s) o Black ice is neither a chemical change nor a physical change o Black ice is an example of a physical change O Black ice is an example of a chemical change O Black ice is both a chemical change and a physical change
Chemistry
1 answer:
umka2103 [35]3 years ago
8 0

Answer:

The rusting of the metal is a chemical change.

Explanation:

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4 0
4 years ago
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Please can someone explain the reason Iron has 2 or 3 valence electrons​
DochEvi [55]

Answer: The electronic configuration of iron is: Ar3d64s2. the two electrons in the 4s orbital are paired, and two of the electrons in the 3d orbitals are paired leaving four unpaired electrons.

Explanation:

8 0
3 years ago
A liquid mixture of 0.400 mole fraction ethanol and 0.600 methanol was placed in an evacuated (i.e., no air) bottle and after ma
deff fn [24]

Answer:

mole fraction methanol = 0.76

mole fraction ethanol = 0.24

Explanation:

Raoult´s law  gives us the partial vapor pressure of a  component in solution as the product of the mole fraction of the component and the value of its pure pressure:

PA  = X(A) x Pº(A)

where PA is the partial vapor pressure of component A, X(A) is the mole fraction of A, and  Pº(A) its pure vapor pressure.

From reference literature the pure pressures of methanol, and ethanol are at 25 ºC :

PºCH₃OH = 16.96 kPa

PºC₂H₅OH =  7.87 kPa

Given that we already have the mole fractions, we can calculate the partial vapor pressures as follows:

PCH₃OH = 0.600 x 16.96 kPa = 10.18 kPa

PC₂H₅OH = 0.400 x 7.87 kPa = 3.15 kPa

Now the total pressure in the gas phase is:

Ptotal = PCH₃OH + PC₂H₅OH  = 10.18 kPa + 3.15 kPa = 13.33 kPa

and the mole fractions in the vapor will be given by:

X CH₃OH  = PCH₃OH / Ptotal = 10.18 kPa/ 13.33 kPa = 0.76

X C₂H₅OH = 1 - 0.76 = 0.24

4 0
3 years ago
If there are two similar, oxygen-containing ions, the ion with more oxygen atoms ends in
Butoxors [25]
<span>there is no answer so i think it should be  -ate. not sure tho without the options

</span>
8 0
3 years ago
1. Calculate how many moles of glycine are in a 130.0-g sample of glycine.2. Calculate the percent nitrogen by mass in glycine.
Alexxx [7]

Answer:

n=1.732mol

\% N=18.7\%

Explanation:

Hello!

In this case, since the molecular formula of glycine is C₂H₅NO₂, we realize that the molar mass is 75.07 g/mol; thus, the moles in 130.0 g of glycine are:

n=130.0g*\frac{1mol}{75.07 g}\\\\ n=1.732mol

Furthermore, we can notice 75.07 grams of glycine contains 14.01 grams of nitrogen; thus, the percent nitrogen turns out:

\% N=\frac{14.01}{75.07}*100\% \\\\\% N=18.7\%

Best regards!

4 0
3 years ago
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