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3 years ago

Please help as fast as u can

Chemistry

2 answers:

pav-90 [236]3 years ago

6 0

Answer:D

DDD

DDDDDDDDDD

Explanation:

sveticcg [70]3 years ago

6 0

Answer:

C. 1 and 3 only

Explanation:

In this element representation';

The superscript (23) s the mass number. Mass Number = Protons + Neutrons

-The subscript (11) is the atomic number.

Atomic Number = Protons

This means;

Number of Protons = 11

Number of Neutrons = 23 - 11 = 12

Number of electrons = 11 (Since it is a neutral atom)

Also sodium belongs to group 1 hence number of outer electrons = 1

The correct option is;

C. 1 and 3 only

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Explanation:

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Please Help! Let P and V represent the pressure and volume of Xe(g). If a piston is used to reduce the volume of the gas to V/2

Elza [17]

1) 2P

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Explanation:

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Mathematically:

$pV=const.$

where

p is the pressure of the gas

V is its volume

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$p_1 V_1 = p_2 V_2$

where:

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$p_2=\frac{P V_1}{V_2}=\frac{pV}{V/2}=2P$

So, the pressure has doubled.

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$v_{rms}=\sqrt{\frac{3RT}{M}}$

where

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T is the absolute temperature (in Kelvin) of the gas

M is the molar mass of the gas

$v_{rms}$ is known as rms speed of the particles in the gas

From the formula, we see that the speed of the atoms in the gas depends only on the temperature of the gas.

In the Xe(g) gas in this problem, the temperature is kept constant; therefore, since nothing changes in the formula, this means that the average speed also does not change.

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strojnjashka [21]

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