A small sack of sand has a density of 1.5 g/cm3 and a mass of 1500 g. How much space (volume) does the sand occupy?

hodyreva [135]

Many, many substances ... when they are surrounded by air and get very
hot ... they combine with the oxygen in the air, forming new substances.
The process is called "burning", and the new substances are often called
"ashes".

If the tungsten filament [were] surrounded by air, then when you turned on
the light and the filament got hot, it would burn, turn to ash, and fall to the
bottom of the bulb in a little pile of dust. This would all happen so fast that
you would see a short, bright '<em>flash</em>', then the light would go out forever, and
you would say "OH ! The bulb burned out. We need to go to the store and
buy another one."

3 0

3 years ago

I WILL MARK THE BRAINLYEST AND GIVE YOU 100 POINTS

yuradex [85]

4 moles

64 grams of oxygen contains 4 moles

3 0

3 years ago

Read 2 more answers

a certain quantity of gas occupies 20l at 50°c and pressure of 2 atm.at what pressure will the volume of the gas will be occupy

Ilia_Sergeevich [38]

Answer:

20atm

Explanation:

according to boyles law P1V1= P2V2

3 0

3 years ago

Why do atoms tend to bonded to other atoms

ExtremeBDS [4]

<u>Answer:</u>

Atoms tend to gain or lose of shares electron in order to get 8 electrons in the outer shell which is called as Octet Rule. “Octa” means 8.

All atoms except noble gases have less than 8 electrons in its outer shell.

These atoms are unstable.

To attain stability atoms either gains or losses or shares electron to get 8 electrons in its outer shell.

Noble gases having 8 electrons in the outer shell is inert and non reactive.

Atomic number = number of electrons = number of protons.

Atomic number of sodium is 11

So the atom contains 11 protons and 11 electrons

To find the number of neutrons we make use of the formula

Mass number - atomic number = number of neutrons

From the periodic table, we know mass number of sodium is 23

So number of neutron = 23 - 11 = 12.

When a sodium atom loses an electron it will have 11 positive protons and 10 negative electrons. Since 1 positive charge is more, Na becomes $Na^+$ .

Positively charged ion is called as cation

Chlorine atomic number is 17 so it has 17 protons and 17 electrons.

When it gains an electrons it will have 17 positive protons and 18 negative electrons since 1 negative charge is more, Cl becomes $Cl^-$ .

Negatively charged ion is called as anion.

The electrostatic attraction between Na+ and Cl- due to the opposite charges gets attracted and forms a bond called ionic bond.

Covalent bond is the bond formed by sharing of electrons. Covalent bond is found among non metals.

For example

$H_2 O$

$Cl_2,O_2,N_2$ are some examples in which we can see covalant bonds

Two atoms of chlorine shares its electrons to form a covalent bond. Chlorine contains 7 electrons in its outer shell.

First chlorine shares its electron with the second one to make it get 8 electrons in its outer shell.

Same way second chlorine shares its electron with the second one to make it get 8 electrons in its outer shell

Each chlorine shares one of its electron with the other to make the other atom to get 8 electrons in the outer shell.

Oxygen contains 6 electrons in its outer shell. Each Oxygen atom shares two of its electron with the other oxygen atom to make it get 8 in the outer shell.

Having 8 electrons in the outer shell makes the atom stable. Thats why atoms either gains or loss or shares electrons to get 8 electrons in the outer shell.