Unit 4

Question 1

Is a changes of state a physical or chemical change?

Answer 1

physical

Question 2

schematic diagram

Answer 2

shows the differences in physical properties and particle arrangement between substances in solid, liquid, gas.

Question 3

Gas->Liquid->Solid

what is temp, molecular motion, and molecular interactions

Answer 3

temp decreases
molecular motion decreases
molecular interactions increases

Question 4

Physical changes : Distillation

Answer 4

separates substances based on boiling points

Question 5

Physical changes: filtration

Answer 5

separates substance based on particle size

Question 6

Physical changes: chromatography

Answer 6

(ink going up paper)
uses differences in intermolecular forces to separate substances

Question 7

Physical changes: deformation

Answer 7

cutting, denting, tearing, stretching, etc

Question 8

Making solutions is an example of

(but not a new substance with new properties)

Answer 8

physical change

(ex- salt and water)

Question 9

Physical properties of physical change

Answer 9

shape, color, texture, flexibility, density, mass

Question 10

Are physical or chemical changes reversible

Answer 10

no they are irreversible

Question 11

physical properties of a chemical change

Answer 11

a precipitate
color change
light
change in temp
sounds
evolution (production) of a gas (bubbles)
formation of a new substance with new properties

Question 12

A+BC–>AC+B

Answer 12

single ionic replacement

Question 13

AB+CD–>AD+CB

Answer 13

double ionic replacement

Question 14

Combustion in an equation

Answer 14

CH4+O2–>CO2+H2O

reactants= CH4 and O
products= CO2 and H2O

Question 15

Redox
(reduction-oxidation)

Answer 15

reduction is when a substance gains electrons
oxidation is when a substance loses elections

Question 16

OIL RIG

Answer 16

oxidation is loss
reduction is gain

Question 17

WHAT ARE YOU GONNA GET ON THE CHEM QUIZ AND TEST

Answer 17

A 100!!!!!!!!!!!!!! LETS GOOOOOOOOOO

Question 18

Is this chemical/physical
mixture/compound:
NaHCO3+CH3COOH->CH3COONa+H2O+CO2

Answer 18

chemical compound

Question 19

Is this chemical/physical
mixture/compound:
C12 H22 O11–>12CO2+11H2O

Answer 19

Chemical compound

Question 20

what are the 7 diatomic elements that are found like that in nature

Answer 20

Br2,I2,N2,Cl2,H2,O2,F2

(Brinclhof)

Question 21

SNAP ions

Answer 21

sodium, nitrate salts(NO3), ammonium(NH4), potassium

Question 22

If you have a snap ion in the equation you…

Answer 22

Always separate!

Question 23

if an element in an equation for a SNAP ion what is its denotation

Answer 23

(aq)

Question 24

what are the only denotation that means you separate the compound in an equation

Answer 24

(aq)

Question 25

What is the overall ionic equation for NaCl(s)-->NaCl(aq)

Answer 25

NaCl(s)-->Na+(aq)+Cl-(aq)

Question 26

What is the overall ionic equation for C6H12O6(s)-->C6H12O6(aq)

Answer 26

C6H12O6(s)-->C6H12O6(aq) stays the same

Question 27

compunds that are (aq) that don't separate

Answer 27

anything but weak acids or bases can be (aq) but dont seperate

Question 28

What else is (aq) but dont separate?

Answer 28

weak acids

Question 29

Weak acids

Answer 29

anything but the strong acids

Question 30

OH- changes to

Answer 30

H2O

Question 31

H3O+ changes to

Answer 31

H2O

Question 32

what are the 6 strong acids

Answer 32

hydrobromic acids HBr Hydrochloric acid HCl Hydroiodic acid HI Nitric acid HNO3 Perchloric acid HCIO4 Sulfuric acid H2SO4

Question 33

What are the 7 strong bases

Answer 33

Lithium hydroxide LiOH Sodium hydroxide NaOH Potassium hydroxide KOH Rubidium hydroxide RbOH Calcium hydroxide Ca(OH)2 Barium hydroxide Ba(OH)2 Strontium hydroxide Sr(OH)2 (last three CBS)

Question 34

Argument that a physical process involves a chemical change

Answer 34

When salt is dissolved in water the ionic bonds between sodium (Na+) and Chloride (Cl-) ions are broken and new ion-dipole interactions are formed between the ion and the water.

Question 35

Label either physical or chemical and intermolecular or intramolecular: CH3OH(l)->CH3OH(g)

Answer 35

physical/intermolecular

Question 36

Label either physical or chemical and intermolecular or intramolecular: 4Fe(s)+3O2(g)-->2Fe2O3(s)

Answer 36

chemical/intramolecular

Question 37

Label either physical or chemical and intermolecular or intramolecular: 2Al2O3(s)-->4Al(s)+2O2(g)

Answer 37

chemical/ intramolecular

Question 38

percent yield formula

Answer 38

actual yield/theoretical yied times 100

Question 39

conversion between 2 substances formulas

Answer 39

atoms---6.02*10^23---moles---mass--grams I 22.4 I volume

Question 40

titrant

Answer 40

solution with a known concentration (NHCl)

Question 41

Analyte

Answer 41

what youre measuring (acid)

Question 42

Jump in the titrant curve

Answer 42

big jump = equivalence point of mols titrant & analyte

Question 43

where is the equivalence point

Answer 43

in the middle of the jump line

Question 44

where is the excess reactant

Answer 44

lower line

Question 45

acids are

Answer 45

proton donors

Question 46

bases are

Answer 46

proton acceptors

Question 47

H2O is usually

Answer 47

a base

Question 48

Base changes to

Answer 48

conjugate acid (gained one proton)

Question 49

acid changes to

Answer 49

conjugate base (lost one proton)