CHEMISTRY: MIXTURES, TINCTURES, AND EMULSIONS

Question 1

Mixture

Answer 1

Differes from a substance in that its composition may vary from one sample to the next
Ex. Of mixtures: soil, air, and seawater

Question 2

[mixture]
Homogeneous mixture

Answer 2

-composition does not vary within the sample
-can be separated by physical means such as distillation or chromatography
Ex. A solution, such as a tbs. of sugar thoroughly dissolved in a cup of hot water—in this solution, each sample of the water should contain an equal amount of dissolved sugar

Question 3

Solution

Answer 3

-Solvent—substance that does the dissolving
-Solute—substance being dissolved

Question 4

Tincture

Answer 4

Solution in which the solvent is alcohol
Ex. Tincture of iodine cont. iodine dissolved in alcohol

Question 5

[mixture]
Heterogeneous mixture

Answer 5

-composition may vary within a sample
-can be separated by physical means such as filtration
-ex. An EMULSION refers to a liquid dispersed in another liquid in which it is not soluble (solubility is the ability of a solute to dissolve in a particular solvent)
-ex. Oil and vinegar
-the addition of certain substances called EMULSIFIERS, stabilizer emulsions
-ex. Adding egg to oil and vinegar to make mayo

Question 6

Solubility

Answer 6

solubility is the ability of a solute to dissolve in a particular solvent)