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oksian1 [2.3K]
2 years ago
13

Why is the sky blue??

Chemistry
1 answer:
borishaifa [10]2 years ago
6 0

Answer:

The gases and particles of earths atmosphere scatter sunlight in different directions making the sky a specific color. Since blue light travels shorter, smaller waves its scattered more than others.

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During an investigation, a student burns magnesium to form magnesium oxide. The starting mass of magnesium is measured as 21.3 g
enot [183]

Answer:

Percentage yield = 85.2%

Explanation:

Given data:

Mass of Mg = 21.3 g

Actual yield of MgO = 30.2 g

Percentage yield = ?

Solution:

Chemical equation:

2Mg + O₂ → 2MgO

Number of moles of Mg = mass/molar mass

Number of moles of Mg = 21.3 g / 24.3 g/mol

Number of moles of Mg = 0.88 mol

Now we will compare the moles of MgO with Mg.

                 Mg           :               MgO

                 2               :               2

                0.88             :             0.88

Mass of MgO:           

Mass of MgO= moles × molar mass

Mass of MgO= 0.88 mol × 40.3g/mol

Mass of MgO =  35.46 g

Actual yield of MgO = 30.2 g

Percentage yield:

Percentage yield = Actual yield/theoretical yield × 100

Percentage yield = 30.2 g/ 35.46 g × 100

Percentage yield = 85.2%

3 0
3 years ago
Explain how stagnant sulfureted water may greatly accelerate metallic corrosion. (See the Email Link in Moodle) | (7 marks)
slavikrds [6]

Answer:

sulfur promotes oxide-reduction reactions.

Explanation:

In stagnant water, some solutes tend to precipitate. When Sulfur precipitate and touch a metal, Sulfur is being reduced and the metal is oxidated. This depends of potential redox of each element.  

6 0
3 years ago
How many moles of an ideal gas are in a tank with a volume of 22.9 L at pressure of 14.297 atm at 12°C? ( Show work and units )
zzz [600]

Answer:

14 moles

Explanation:

For an Ideal gas,

PV = nRT...................... Equation 1

Where P = Pressure, V = Volume, n = number of mole, R = Molar gas constant.

make n the subject of the equation

n = PV/RT.................. Equation 2

Given: P = 14.297 atm, V = 22.9 L = 22.9 dm³, T = 12 °C = (12+273) K = 285 K.

Constant: R = 0.082 atm.dm³/K.mol

Substitute these values into equation 2

n = (14.297×22.9)/(285×0.082)

n = 327.4013/23.37

n = 14.009

n ≈ 14 moles

3 0
3 years ago
A basketball has a mass of 1 kg and is traveling 15 m/s. How fast would a 6 kg bowling ball have to travel to have the same mome
notsponge [240]
The answer is A.4m/s because a bowling ball has more mass then a basketball

I hope this helps
6 0
3 years ago
About 97.5% of Earth’s water is
emmasim [6.3K]

Answer: Water

Explanation:

6 0
3 years ago
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