Match these terms with the correct examples.
1. liquid solution
2. gaseous solution
3. compound
4. colloid
5. element
a. oceans
b. clouds
c. oxygen
d. air
e. water

           1) Liquid solution: Oceans

            2) Gaseous Solution: Air

            3) Compound:  Water

            4) Colloid: Cloud

            5) Element: Oxygen

                        Solutions are those mixtures which have uniform composition. The size of solute is around 1 Angstrom hence, the particles of solutes can not be seen and the interactions make the overall solution transparent.

                        Compounds are those substances which are formed chemically by the reaction of two different elements like,

                                       O₂  +  2 H₂    →    2 H₂O

                        Colloids are also mixtures but these are intermediate between true solutions and suspensions. Also, the solute size is greater than that of solute size in solutions and is about 10 Angstrom. Examples include Clouds, Fog, Moist, Aerosol sprays e.t.c.

                        Elements are those substances which either are made up of single atoms like noble gases or are molecules made up of same elements like O₂, H₂, Cl₂, N₂ e.t.c.

molecules are free to separate from each other and will take on the shape of the container. molecules move completely at random and high speeds. they vibrate in a fixed position and do not move around much. molecules expand to the edge of their container.

the old price per ounce is c/4.

the new price per ounce is c/3.6.

the ratio of the old price to the new one is

(c/4)/(c/3.6) = (c/c)×(3.6/4) = 0.9 . . = 9/10 . . "nine tenths" in either form