properties of matter test

Question 1

physical changes

Answer 1

does not change the substance when measured

ex: weight, color, odor, length, flexibility, conductivity

Question 2

density formula

Answer 2

mass/volume

unit: g/mL or g/cm3

Question 3

chemical changes

Answer 3

changes the substance into something new

ex: burning, cooking, rust, chemical, reactions to produce a new substance
evidence: new color, new odor, new gas produced, light produced, new solid formed from two liquids (precipitate), temperature change (exothermic/endothermic)

Question 4

mixtures

Answer 4

two or more substances that are not bonded together chemically and can be separated by physical means

Question 5

solutions

Answer 5

an evenly mixed mixture (the same throughout)

Question 6

unsaturated

Answer 6

type of solution

when more solute can still be dissolved

Question 7

saturated

Answer 7

type of solution

when the solution is so concentrated (strong) that no more solute can be dissolved, reached maximum amount

Question 8

supersaturated

Answer 8

when more solute can be dissolved in solvent by changing temperature or pressure

Question 9

parts of solution

Answer 9

solute & solvent

Question 10

solute

Answer 10

what is being dissolved into the solvent

Question 11

solvent

Answer 11

the solute is dissolved into this

Question 12

ways to separate

Answer 12

1. settling
2. straining
3. filtering
4. distillation

Question 13

settle

Answer 13

over time particles separate

Question 14

strain

Answer 14

large particles cannot pass through strainer

Question 15

filter

Answer 15

only dissolved particles in solution can pass through a filter

Question 16

distillation

Answer 16

evaporate solvent to leave solute behind

Question 17

concentration

Answer 17

the amount of solute dissolved in a certain amount of solvent

Question 18

concentration formula

Answer 18

c = (mass dissolved solute/volume of solvent) x 100

Question 19

solubility

Answer 19

the maximum concentration

Question 20

solubility formula

Answer 20

s = (MAX mass dissolved solute/volume of solvent) x 100

Question 21

colloids

Answer 21

a mixture where particles do not dissolve or settle (in between a solution and suspension)

Question 22

suspensions

Answer 22

a not evenly mixed mixture where particles do not dissolve and settle to the bottom or float