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3 years ago

_____of gas molecules with an object is the cause of pressure by a gas.

Chemistry

2 answers:

Colt1911 [192]3 years ago

7 0

Answer:

Collisions

Explanation:

It says that it was the answer.

alexira [117]3 years ago

3 0

Answer:

Gas Pressure

Explanation:

Gas pressure is caused by the force exerted by gas molecules colliding with the surfaces of objects (Figure 5.2. 1). Although the force of each collision is very small, any surface of appreciable area experiences a large number of collisions in a short time, which can result in a high pressure.

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2. An exothermic reaction releases 86.5 kJ. How many kilocalories of<br> energy are released?

Alenkasestr [34]

Answer:

20.67 kcal of energy is released.

Explanation:

It is given that, an exothermic reaction releases 86.5 kJ. We need to convet kJ to calories.

Since,

1 kcal = 4.184 kJ

So,

1 kJ = 0.239 kcal

For 86.5 kJ,

86.5 kJ = (0.239 × 86.5) kcal

86.5 kJ = 20.67 kcal

So, 20.67 kcal of energy is released.

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3 years ago

A certain radioactive isotope placed near a Geiger counter registers 160 counts per second. 32 hours later, the counter register

stealth61 [152]

I believe that the answer for this question would be option A. 8 HOURS. Based on the given scenario above about a certain radioactive isotope placed near a Geiger counter, the half-life <span>of the isotope 32 hours later would be 8 hours. Hope this is the answer that you are looking for. </span>

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3 years ago

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Which of the following is a balanced chemical equation?

True [87]

Answer:

equation number 3 is balanced.

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3 years ago

A flask at room temperature contains exactly equal amounts (in moles) of nitrogen and xenon.

zalisa [80]

Answer:

a) Same

b) Nitrogen

c) Same

d) Nitrogen

Explanation:

The formula for partial pressure of a gas is equal to

$p_B = n_B \frac{RT}{V}$

Here nB is the number of moles .

The number of moles for both the gases are same and hence the partial pressure for the two gases will also be same.

b) The greater average velocity is calculated by using following formula

$v_{RMS} = \sqrt{3RTM}$

Here M is the molar mass.

Molar mass of nitrogen is greater than the molar mass of xenon and hence nitrogen will have higher greater average velocity

c) As we know, the average kinetic energy of gas particles is dependent on the absolute temperature of gas and if all the gases are at same temperature, their kinetic energy will also be same. Since nitrogen and xenon are at same temperature, their kinetic energy will be same

d) Effusivity is depended directly on the thermal conductivity, density and and the specific heat capacity.

All these three parameters are higher in case of nitrogen. Thus, it will effuse first

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3 years ago

Gasoline and motor oil are chemically similar. They are both mixtures of nonpolar hydrocarbons containing carbon and hydrogen at

AnnyKZ [126]

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Water’s molar mass is 18.01 g/mol. The molar mass of methanol is 32.01 g/mol. At room temperature, water is 64% more viscous than methanol. Which substance has the stronger intermolecular attraction? water

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3 years ago

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