Answer:
Matter is classified into two broad categories, namely, pure substances and mixtures. Mixtures can be separated into pure substances by physical methods. Pure substances are further divided into categories as elements and compounds. ... A pure substance can be either an element or a compound.
Explanation:
Liquid solution - oceans
gaseous solution - air
compound - water
colloid - clouds
element - oxygen
<u>Answer:</u> The pressure that the gas exert at high temperature is 9.63 atm
<u>Explanation:</u>
To calculate the final pressure of the system, we use the equation given by Gay-Lussac Law. This law states that pressure of the gas is directly proportional to the temperature of the gas at constant pressure.
Mathematically,

where,
are the initial pressure and temperature of the gas.
are the final pressure and temperature of the gas.
We are given:
![P_1=5.0atm\\T_1=76^oC=[76+273]K=349K\\P_2=?\\T_2=399^oC=[273+399]K=672K](https://tex.z-dn.net/?f=P_1%3D5.0atm%5C%5CT_1%3D76%5EoC%3D%5B76%2B273%5DK%3D349K%5C%5CP_2%3D%3F%5C%5CT_2%3D399%5EoC%3D%5B273%2B399%5DK%3D672K)
Putting values in above equation, we get:

Hence, the pressure that the gas exert at high temperature is 9.63 atm