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3 years ago

When people walked on the Moon, they found that they could jump higher than they could back on Earth. Why is this true?

Chemistry

1 answer:

Allushta [10]3 years ago

8 0

Answer: B

Explanation: the moon is smaller and contains less mass, therefore its gravitational pull is less than that of Earth's.

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Kcat40623. can someone help me get her name??

Anna71 [15]

No, I don’t even know who they are.

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3 years ago

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Suppose that you add 26.7 g of an unknown molecular compound to 0.250 kg of benzene, which has a K f of 5.12 oC/m. With the adde

nadya68 [22]

Answer: The molar mass of the unknown compound is 200 g/mol

Explanation:

Depression in freezing point is given by:

$\Delta T_f=i\times K_f\times m$

$\Delta T_f=2.74^0C$ = Depression in freezing point

i= vant hoff factor = 1 (for molecular compound)

$K_f$ = freezing point constant = $5.12^0C/m$

m= molality

$\Delta T_f=i\times K_f\times \frac{\text{mass of solute}}{\text{molar mass of solute}\times \text{weight of solvent in kg}}$

Weight of solvent (benzene)= 0.250 kg

Molar mass of solute = M g/mol

Mass of solute = 26.7 g

$2.74^0C=1\times 5.12\times \frac{26.7g}{Mg/mol\times 0.250kg}$

$M=200g/mol$

Thus the molar mass of the unknown compound is 200 g/mol

4 0

4 years ago

The movement of the earths plates is also called

s344n2d4d5 [400]

Answer:The outer shell of the Earth is a series of large blocks called the tectonic plates. Though the surface of the Earth appears to be still, it is actually moving all the time. And, it is this movement of these plates that is responsible for earthquakes, volcanic eruptions, and the formation of mountains on the Earth’s surface.

Explanation:

7 0

4 years ago

Which substance is most soluble in water? 1) (NH4)3PO4 2)Cu(OH)2 3) AG2SO4 4) CACO3

ivann1987 [24]

Answer: Option (1) is the correct answer.

Explanation:

When dissolved in water, ammonium phosphate $(NH_{4})_{3}PO_{4}$ completely dissociates into ions and it gets attached to the opposite ends of water.

Therefore, it is soluble in water.

Whereas silver sulfate $(Ag_{2}SO_{4})$ slightly dissolves into water as it gives very less $Ag^{+}$ ions. Therefore, silver sulfate has low solubility.

On the other hand, both $Ca(OH)_{2}$ and $CaCO_{3}$ are insoluble in water.

Thus, we can conclude that out of the given options, $(NH_{4})_{3}PO_{4}$ is most soluble in water.

8 0

4 years ago

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A sample of hydrogen gas at 1.50 atm and constant volume is heated from 0∘C to 150∘C. What will be the final pressure of the gas

Julli [10]

Answer:

2.32

Explanation:

For the resolution of the problem one of the laws of Charles - Gay Lussac must be used, in which it is stated that if a certain amount of gas is kept at a constant volume (as in this case), its pressure will be directly proportional to its absolute temperature. Mathematically, it can be written as follows:

$\frac{P}{T} = Constant$ ⇒to constant V

In the case of the statement, that we have an initial system (P₁ and T₁) and an final system (P₂ and T₂), the equation can be written:

$\frac{P1}{T1} = \frac{P2}{T2}$

It can be rearranged to clear P₂ which is what needs to be calculated, then:

$P2=\frac{P1 . T2}{T1}$

It would only be necessary to convert the temperature units from ° C to K, to have the absolute temperature values. If T (K) = t (° C) + 273.15, then:

T₁ = 0 + 273.15 = 273.15 K

T₂ = 150 + 273.15 = 423.15 K

Now, you can replace the values to the equation and calculate P₂

$P2 = \frac{1.50 atm . 423.15K}{273.15 K} = 2.3237atm$ ≅ 2.32 atm

As the statement requests the result with three significant figures and no units, the answer is that the final pressure is 2.32

7 0

3 years ago