1. Define Matter .

Chemistry

1 answer:

Fantom [35]4 years ago

6 0

Answer:

1. Anything that has mass and occipies space is called matter.

2. The difference between Living and Non-Living Matter are :

Living Matter :

The earth is home to all kinds of plants and animals. They can grow , move and reproduceon their own .
It is natural only .

Non - Living Matter :

Most of the matter in the inverse is non-living. It means that it does not grow, move or reproduce on its own .
It can be natural and non-made.

3. Atom is the smallest particle from which matter is made up of.

4. The one difference between atoms and Molecules are :

Atoms

Atoms may or may not have independent existence

Molecules :

Molecules have independent existence.

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How are electrons excited in element?

sineoko [7]

Answer:

By absorbing energy electron is jump into higher energy level. This is called excitation.

Explanation:

The electron is jumped into higher level and back into lower level by absorbing and releasing the energy.

The process is called excitation and de-excitation.

Excitation:

When the energy is provided to the atom the electrons by absorbing the energy jump to the higher energy levels. This process is called excitation. The amount of energy absorbed by the electron is exactly equal to the energy difference of orbits. For example if electron jumped from K to L it must absorbed the energy which is equal the energy difference of these two level. The excited electron thus move back to lower energy level which is K by releasing the energy.

De-excitation:

When the excited electron fall back to the lower energy levels the energy is released in the form of radiations. this energy is exactly equal to the energy difference between the orbits. The characteristics bright colors are due to the these emitted radiations. These emitted radiations can be seen if they are fall in the visible region of spectrum.

4 0

3 years ago

Boron has two naturally-ocurring isotopes. Boron-10 has an abundance of 19.8% and actual mass of 10.013 amu, and boron-11 has an

aniked [119]

Answer:

Average atomic mass = 10.812 amu

Explanation:

The formula for the calculation of the average atomic mass is:

$Average\ atomic\ mass=(\frac {\%\ of\ the\ first\ isotope}{100}\times {Mass\ of\ the\ first\ isotope})+(\frac {\%\ of\ the\ second\ isotope}{100}\times {Mass\ of\ the\ second\ isotope})$