Compounds Atoms
Molecules
Things that can be found on the periodic table
an element
How can you experimentally tell if something is ionic or covalent?
What would be ionic? What would be covalent?
If it conducts electricity it is ionic and has a metal in it.
If it doesn't conduct electricity, it's covalent - no metals.
CO
Carbon monoxide
Pure or Mixed? Element or compound? If mixed, heterogenous or homogenous?
HN03
pure, compound
Name this:
diphosphorus hexaoxide
P2O6
Basic unit of a chemical element
an atom
How can you tell from the periodic table if something is a metal or non-metal?
Metals are below the stairs. Non- metals, above the stairs plus H.
CaO
calcium oxide
Pure or Mixed? Element or compound? If mixed, heterogenous or homogenous?
Sb (antimony)
pure, element
dinitrogen tetrahydride
N2H4
Groups of two or more atoms help together by chemical bonds.
EX:H20, O2, NaCl
Molecule
Ionic or Covalent? and name
SiF4
covalent
Sulfur tetrafluoride
Al2S3
Aluminium trisulfide
Copper wire
pure, element Cu
Na2S
Sodium Sulfide
These are examples of:
H20
CO2
CH4
Molecules OR compounds
Ionic or covalent and name?
CaBr2
Ionic
calcium bromide
H20
dihydrogen monoxide
Pure or Mixed? Element or compound? If mixed, heterogenous or homogenous?
fresh squeezed lemonade
heterogeneous mixture
A chemist decomposes 150.0g of water (H20). They find that 14.6 g of hydrogen is made, how much oxygen is produced? (use sig figs)
150.0g-14.6g = 135.4g of oxygen
(go with least precise)
What is ozone? O3
molecule
Ionic or covalent and name
RbCl
ionic
Rubidium chloride
N4H6
tetranitrogen hexahydride
Pure or Mixed? Element or compound? If mixed, heterogenous or homogenous?
C6H12O6
compound
Show how the law of conservation of mass is proven when 28.4 grams of carbon react with 7.08 grams of hydrogen, natural gas that is burned in a gas stove is produced. There is NO leftover carbon or hydrogen when these quantities are used. How much of each would you need to make 246.0 g of natural gas?
C = 197 g
H = 49.0 g
1.Find total mass first:
28.4 g C + 7.08 g H = 35.08 total g of natural gas = SF = 35.5 g
2. Find ratio
246.0g/35.5g = 6.93 (dimensionless quantity)
3. Find new quantity based on 6.93 x bigger28.4g x 6.93 = 196.8 g of C = SF = 197 g of C
7.08 g x 6.93 = 49.06g = SF = 49.0 g of H197+49.0 = 246.0g
***Conservation of mass means no matter was created nor destroyed.