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tigry1 [53]
3 years ago
12

The darkest part of the moon’s shadow is called the penumbra?

Chemistry
2 answers:
Georgia [21]3 years ago
6 0
No, the penumbra is the shadow that surrounds the darkest part of the shadow the darkest part of the shadow is called the umbra.
irakobra [83]3 years ago
3 0
 No it's the Umbra. hope that helped.
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The solubility of a gas in water is 0.22 g/L at 20.0 kPa of pressure. What is the solubility when the pressure is increased to 1
Allisa [31]

Answer:

Solubility is 1.265g/L

Explanation:

According to Henry's law which states that the solubility of a gas in liquid is directly proportional to the pressure of the gas above the solution.

Sg1 / P1 = Sg2/ P2,

where Sg is the gas solubility, P is the gas pressure.

Sg1 = 0.22

P1 = 20kPA

P2 = 115kPA

Sg2 =?

Sg2 = Sg1 P2 / P1

Sg2 = 0.22 * 115*10^3 / 20*10^3

Sg2 = 25.3*10^3 / 20*10^3

Sg2 = 1.265g/L

the solubility of the gas in water at the new pressure is 1.265g/L

7 0
3 years ago
A 250mL sample of oxygen is collected over water at 30 C and 850 torr pressure. What is the pressure of the dry gas alone?
3241004551 [841]

Answer:

p_O=818.2torr

Explanation:

Hello there!

In this case, according to the given equation, it is possible to calculate the mass of oxygen by using the Dalton's law, considering that the total pressure is 850 torr and the vapor pressure of water at 30°C is 31.8 torr:

P_T=p_O+p_{H_2O}

Thus, we solve for the pressure of oxygen as follows:

p_O=P_T-p_{H_2O}\\\\p_O=850torr-31.8torr\\\\p_O=818.2torr

Best regards!

6 0
3 years ago
Give the product of the reaction of excess benzene (2 equivalents) with dichloromethane and alcl3.
SOVA2 [1]
Hello!

The product of the reaction of excess benzene with dichloromethane is diphenylmethane. 

The reaction that benzene undergoes with dichloromethane is a Friedel-Crafts Alkylation, in which firstly Benzene is alkylated to Benzyl Chloride, and after that, the Benzyl Chloride reacts with another equivalent of Benzene to form the compound Diphenylmethane. The Reaction Scheme is shown in the image below:

Have a nice day!

5 0
3 years ago
In this molecule, what's the formal charge on the central O atom?
olga_2 [115]

The answer you are looking for is C

3 0
3 years ago
Read 2 more answers
A chemist heats the block of copper as shown in the interactive, then places the metal sample in a cup of oil at 25.00 °C instea
Mazyrski [523]

When the oil is added to the heated copper, the energy in the system is

conserved.

  • The mass of the oil in the cup, is approximately <u>64.73 grams</u>.

Reasons:

The question parameters are;

Temperature of the oil in the cup = 25.00°C

Final temperature of the oil and copper, T₂ = 27.33 °C

Specific heat of copper, c₂ = 0.387 J/(g·°C)

Specific heat capacity of oil, c₁ = 1.74 J/(g·°C)

Required:

The<em> mass of oil</em> in the cup.

Solution:

The mass of the copper, m₂ = 17.920 g

Temperature of copper after heating, T₂ = 65.17°C

Temperature of the copper after being placed in the cup of oil, T₂ = 27.33°C

Heat lost by copper = Heat gained by the oil

  • m₂·c₂·(T₂ - T₃) = m₁·c₁·(T₃ - T₁)

Therefore, we get;

17.920 × 0.387 × (65.17 - 27.33) = m₁ × 1.74 × (27.33 - 25)

262.4219136 = 4.0542·m₁

m₁ ≈ 64.73

  • The mass of the oil in the cup, m₁ ≈ <u>64.73 g</u>

Learn more here:

brainly.com/question/21406849

<em>Possible part of the question obtained from a similar question online, are;</em>

<em>The mass of the copper, m₂ = 17.920 g</em>

<em>Temperature of copper after heating = 65.17°C</em>

6 0
3 years ago
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