Elements and Matter
How many elements are known? How many are naturally occuring?
118, 98
Example of a physical change
Water changing phases; melting ice into water then evaporating water into steam
pH is a what scale
Logarithmic
Universal solvent
Water
What was the first surfactant
Soaps
what element does something need for it to be considered organic?
Carbon
Example of an elemental molecule
O2 (oxygen)
if a substance has more hydrogen ions it is more what?
Acidic
What emulsion is a cold cream
Water in oil
An atom or molecule needs what to make an ion
Electrical charge
What determines an element?
Number of protons
Example of a compound element
Sodium chloride (NaCl/table salt)
What is missing if a solution has no pH, extra 300 points if you can give an example of something with no pH
Missing water, olive oil & gasoline have no pH
The head and tail of a surfactant mole are what?
Head- hydrophilic
Tail- lipophilic
Two of these make a molecule
Atoms
What is found on the periodic table information for each element? (4)
Atomic number, element name, symbol, atomic mass
Example of a physical property and chemical property
Physical- boiling point
Chemical- burning wood
Pure water has a neutral pH so it has the same number of what ions?
Hydrogen and hydroxide ions
What has the largest particles out of the solution, suspension, and emulsion?
Emulsion
Colorless liquid or white crystals with unpleasant odor
Thioglycolic acid
Everything is made of what? (2)
matter and energy
Example of chemical change
Creation of water through acid-alkali neutralization
If distilled water is a pH of 7 and hair and skin is a pH of 5 how many more times acidic is your hair and skin?
100 times more acidic
What is the color of a solution, suspension, emulsion
Clear, cloudy, solid color
What makes an atom
Electron proton neutron