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Taya2010 [7]
3 years ago
10

Explain the observed pattern of how the sizes and charges of atoms change with the addition and subtraction of electrons. ( NEED

ANSWER ASAP)
Chemistry
1 answer:
siniylev [52]3 years ago
3 0
Atoms are the smallest particles of matter.​
b. The mass of an iron atom is different from the mass of a copper atom.​
c. Every atom of silver is identical to every other atom of silver.​
d. A compound is composed of atoms of two or more different elements.​
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State the Periodic Law. Why is it so important in the study of chemistry?
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Answer:

Summary. To summarize, the periodic table is important because it is organized to provide a great deal of information about elements and how they relate to one another in one easy-to-use reference. The table can be used to predict the properties of elements, even those that have not yet been discovered.

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A chemist prepares a sample of helium gas at a certain pressure, temperature and volume and then removes all but a fourth of the
cupoosta [38]

Answer:

The temperature must be changed to 4 times of the initial temperature so as to keep the pressure and the volume the same.

Explanation:

Pressure in the container is P and volume is V.

Temperature of the helium gas molecules =T_1

Molecules helium gas = x

Moles of helium has = n_1= \frac{x}{N_A}

PV = nRT (Ideal gas equation)

PV=n_1RT_1...[1]  

After removal of helium gas only a fourth of the gas molecules remains and pressure in the container and volume should remain same.

Molecules of helium left after removal = \frac{x}{4}

Moles of helium has left after removal = n_2= \frac{x}{4\times N_A}

PV=n_2RT_2...[2]

n_1RT_1=n_2RT_2

\frac{x}{N_A}\times T_1=\frac{x}{4\times N_A}\times T_2

T_1=\frac{T_2}{4}

T_2=4T_1

The temperature must be changed to 4 times of the initial temperature so as to keep the pressure and the volume the same.

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True or false: Nonmetals are good conductors of electricity?
Ostrovityanka [42]

Answer:

False

They dont conduct electricity that well/at all

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Explanation:

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