Tesdt 2 Flashcards
suspensions
unstable physical mixture of undissolved particles in a liquid
chemistry 2
science that deals with composition of structures and properties of matter
how matter changes under different conditions.
matter 3
any substance that occupies space and has mass (weight)
all matter as physical and chemical properties. all matter is chemical
solid liquid gas
energy 1
is not matter; does not occupy space or have mass
element
simplest form of chemical matter - containing only one type of atom
cannot be made simpler without loss of identity
118 known, 98 are naturally occurring
identified by letter to symbol
atoms 3
Basic unit of matter - cannot be divided into simpler substance by ordinary means
nucleus at centre an negative charged electrons orbiting nucleus
number of protons determines the element
protons 1
subatomic particles with positive charge
neutrons 1
subatomic particles with no charge
molecules 2
chemical combination with two or more atoms in definite fixed proportions (H2O)
elemental and compound
elemental molecule 3
chemical combination of atoms of the same element in fixed proportions
air= O2
ozone= O3
compound molecule2
chemical compounds of 2 or more atoms of different elements in a fixed proportion
table salt= 1 atom of sodium (Na) and one atom of chlorines (Cl) = NaCl
2 ways matter can be changed
physical forces causing physical change
chemical reactions causing chemical changes. `
physical change 3
form is changed without becoming a new substance, no chemical reactions
solid ice melting into water, then converts to steam with heat
nail polish applied, solvent evaporates leaving film
chemical change 4
change in the chemical composition or makeup of substance
chemical reactions resulting in new makeup combining or subtracting certain elements
creates different chemical and physical properties
reactions of acids and alkalis (neutralization) with heat forms water by chemical change
physical properties
2
characteristics determined without chemical reaction and do not involve chemical change.
color, odor, weight, density etc.
chemical properties 2
characteristics determined with a chemical reactions involving chemical change in substance.
change in identity- iron rusting, wood burning, etc.
Pure Substances 4
chemical combination of matter in definite (fixed) proportions
have unique properties
most substances do not sit in a pure state
water- H2O and salt- NaCl
physical Mixture 5
physical combination of matter in any proportion
properties are combined properties of substances in the mixture
most product we use are physical mixtures
solutions, suspensions and emulsions
salt water - mix of slat and water and is salty and wet
uniform and non uniform physical mixtures 2
uniform- air, salt water, hydrogen peroxide
non uniform- most beauty products
solution 2
a stable uniform mixtures of 2 or more substances
do not separate when left still
solute 1
the substance that is dissolved in a solution
solvent 1
the substance that dissolves the solute making the solution
miscible liquids 2
mutually soluble - can be mixed together to form solutions and will stay mixed
water and alcohol in nail polish remover
immiscible liquids 3
not capable of being mixed to form stable solutions.
can be mixed but will separate when left still - water and oil
when immiscible liquids are combined it is a suspension
suspensions 4
unstable physical mixtures of undissolved particles in a liquid separate over time
contain large and fewer miscible particles , not large enough to quickly settle to the bottom
not usually transparent
glitter and nail polish, separates and needs to be mixed before use.
emulsions 3
unstable physical mixture of 2 or more immiscible substances, AND an special ingredient called an emulsifier.
special type of suspension as they do separate but usually slowly over a long period of time.
properly stored can be stable up to 3 years- but should be used within 1 year
emulsifiers 1
ingredient that brings two normally incompatible materials together combining them into uniform fairly stable mixture.
differences between solutions, suspensions and surfactants chart (5 each column)
solutions:
- miscible
- no surfactant
- small particles
- stable mixture
- usually clear
suspensions:
- slightly miscible
- no surfactant
- larger particles
- unstable, temporary mixture
- usually cloudy
emulsions:
- immiscible
- surfactant
- largest particles
- limited stability through emulsifier
- usually solid color
surfactants 2
substances that allow oil and water to mix/emulsify
type of emulsifier
surfactant molecule 2 distinct parts
head= Hydrophilic= water loving- capable of combining with and attracting water
tail= lipophilic= oil loving- attraction to fat/oils
oil in water emulsions 2
oil droplets are emulsified in water as they are surrounded by surfactant lipophilic tails pointing inwards and head (hydrophilic) pointing outwards
oil in water does not feel as greasy because oil is hidden and water forms outer parts
water in oil emulsions
water droplets are emulsified in oil surrounded by surfactant hydrophilic heads pointing in and tails out
water forms inner part of emulsion and oils is outer- makes a greasy feeling.
ointments 3
physical mixture
semi-solid
made with any combination of petrolatum, oil and wax
powders 1
physical mixture of 2 solids
common chemical product ingredients 6
- volatile alcohols
- alkanolamines
- ammonia
- glycerin
- silicones
- volatile organic compounds (VOC)
volatile alcohols 2
evaporate easily
isopropyl alcohol, ethyl alcohol
alkanolamines 2
- alkaline substances used to neutralize acids or raise the pH of many hair products
often used in place of ammonia
ammonia 4
colorless with pungent odour
composed of nitrogen and hydrogen in water solution - ammonia water
used to raise pH
can irritate skin
glycerin 2
- sweet colourless, oily substance
used as solvent and moisturizer
silicone 3
special type of oil used in hair conditioners, water resistant lubricants for skin and nail polish dryers
less greasy than many other oils
can give silky, smooth feel to skin and shine to hair
volatile organic compounds (VOC) 3
compounds that contain carbon (organic) and evaporate very easily (volatile)
liquids or soifs used in consumer products that turn into as when exposed to hair/sunlight
ethyl alcohol
overexposure principle 3
toxicity-related to how substance is used
prolonged repetitive use can have effects
overexposure determined toxicity
pH 4
potential hydrogen
p= quantity
H= hydrogen ions
= quantity of hydrogen ions
ion 1
atom or molecule that carries an electrical charge
ionization 1
separation of atom/molecule into positive/negative ions
anion 1
ion with a negative charge
cation 1
ion with a positive charge
water ionization and pH what scale is measuring 4
in pure water some water molecules naturally ionize into hydrogen ions and some into hydroxide ions
hydrogen ion (H+) is acidic
hydroxide (OH-) is alkaline
pH scale measures the quantity of hydrogen ions and hydroxide ions within a substance
what kind of solutions have pH/can be measured for pH 2
only aqueous solution have pH, without water there is no pH
Non-aqueous (oil and alcohol) do not have a
pure water pH 2
same amount of hydrogen and hydroxide ions
neutral - 50% acidic 50% alkaline
pH and acne 3
Propionibacterium acnes is found on everyones skin and when levels are higher people are more prone to breaking out
P.Acnes minimal pH of 5.5
more alkaline environment allows p.acnes to thrive- 5.5 soaps are best for acne
acidic solution 4
pH below 7 (0-6)
hair and skin have pH of 5
owe chemical reactivity to hydrogen ion (H+)
AHA, Thioglycolic acids, glycolic acid
alkaline/base solution4
pH above 7 (8-14)
owe chemical reactivity to hydroxide ions (OH-)
feel slippery and soapy on skin
sodium hydroxide
neutral solution 1
pH of 7
the pH scale 5
measure of acidity and alkalinity of substance
0-14
> 7 is acidic
<7 is alkaline
7=neutral
logarithm 3
multiples of 10s
pH scale is logarithmic, change in one whole number represents tenfold of change, 2 whole number is 10x10/100fold change
ph of 8 is 10x more alkaline then 7
neutralization reactions 1
mixing acids and alkalis in equal proportions equals water
oxidation-reduction 3
AKA redox reactions
reaction where oxidization and reduction takes place at the same time
when oxygen is chemically combined with substance it is oxidized when oxygen is chemically removed from substance it is reduced.
exothermic 1
chemical reactions that are characterized by the release of heat produced from oxidation reaction
factors that can affect pH (acidic Mantle ) 8
- cosmetics
- skincare
- genetics and age
- antibacterial products
- sebum and sweat
- digestion,
- hormones,
- metabolism
where does pH balancing take place 1
kidneys -filters acids and bases
oxidizing agent 1
substance that releases oxygen
reducing agent 1
substance that adds hydrogen to a chemical compound or subtracts oxygen from the compound
combustion 1
rapid oxidation of substance accompanied by heat and light
endothermic reaction 1
chemical reaction that requires the absorption of energy or heat from an external source for reaction to occur.
toner for pH 2
keeps bacteria in line with skin pH
works as a double cleanse because they remove impurities.
pH of moisturizers
5-7
pH of serums
4-6
ascorbic acid vitamin C serums pH and why
2.6-3.2
helps exfoliate skin