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3 years ago

Increasing the volume of a given amount of gas at constant temperature causes the pressure to decrease because

2 answers:

7 0

Answer: Increasing the volume of a given amount of gas at constant temperature causes the pressure to decrease because the molecules are more spread apart.

Explanation:

In a container, when volume is increases, the particles get separated from each other.

The intermolecular spacing between the particles increases, which makes the intermolecular interaction between the particles decrease.

When the attraction between the particles decreases, the pressure on the particles also decreases.

Hence, increasing the volume of a given amount of gas at constant temperature causes the pressure to decrease because the molecules are more spread apart.

mestny [16]3 years ago

5 0

Because the molecules are more spread apart.

(gas spread)

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What causes the shielding effect to remain constant across a period?

Ivanshal [37]

Electrons are added to the same principal energy level.

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3 years ago

How many grams of sodium acetate are in solution in the third beaker?

Kipish [7]

Answer:

46g of sodium acetate.

Explanation:

The data is: Precipitation from a supersaturated sodium acetate solution. The solution on the left was formed by dissolving 156g of the salt in 100 mL of water at 100°C and then slowly cooling it to 20°C. Because the solubility of sodium acetate in water at 20°C is 46g per 100mL of water, the solution is supersaturated. Addition of a sodium acetate crystal causes the excess solute to crystallize from solution.

The third solution is the result of the equilibrium in the solution at 20°C. As the maximum quantity that water can dissolve of sodium acetate at this temperature is 46g per 100mL and the solution has 100mL there are 46g of sodium acetate in solution. The other sodium acetate precipitate because of decreasing of temperature.

I hope it helps!

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3 years ago

How do you think the flooding likely affected the ecosystem?

Lapatulllka [165]

Answer

raise/lower temp of certain ecosystems. Bring new predators/prey. Erode surrounding environment

Explanation:

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3 years ago

A pycnometer is a precisely weighted vessel that is used for highly accurate density determinations. Suppose that a pycnometer h

dexar [7]

Answer:

5.758 is the density of the metal ingot in grams per cubic centimeter.

Explanation:

1) Mass of pycnometer = M = 27.60 g

Mass of pycnometer with water ,m= 45.65 g

Density of water at 20 °C = d = $998.2 kg/m^3$

1 kg = 1000 g

$1 m^3=10^6 cm^3$

$998.2 kg/m^3=\frac{998.2 \times 1000 g}{10^6 cm^3}=0.9982 g/cm^3$

Mass of water ,m'= m - M = 45.65 g - 27.60 g =18.05 g

Volume of pycnometer = Volume of water present in it = V

$Density=\frac{Mass}{Volume}$

$V=\frac{m'}{d}=\frac{18.05 g}{0.9982 g/cm^3}=18.08 cm^3$

2) Mass of metal , water and pycnometer = 56.83 g

Mass of metal,M' = 9.5 g

Mass of water when metal and water are together ,m''= 56.83 g - M'- M

56.83 g - 9.5 g - 27.60 g = 19.7 g

Volume of water when metal and water are together = v

$v=\frac{m''}{d}=\frac{19.7 g}{0.9982 g/cm^3}=19.73 cm^3$

Density of metal = d'

Volume of metal = v' = $\frac{M'}{d'}$

Difference in volume will give volume of metal ingot.

v' = v - V

$v'=19.73 cm^3-18.08 cm^3=$

$v'=1.65 cm^3$

Since volume cannot be in negative .

Density of the metal =d'

= $d'=\frac{M'}{v'}=\frac{9.5 g}{1.65 cm^3}=5.758 g/cm^3$

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3 years ago

The statement "electrons have a negative charge" is true. Select the correct evidence scientist have that proves this statement

Kryger [21]

The question is incomplete but i will try to offer as much help as i can.

Answer:

See explanation

Explanation:

The electron was discovered by J.J Thompson. His model of the atom was called the plum-pudding model of the atom.

He discovered that cathode rays being negatively charged particles were deflected by a magnet in just the same way as moving, negative electrically charged particles.

Similarly, in an electric field, they are deflected towards the positive plate of the electrostatic field which shows that they are negatively charged.

3 0

3 years ago