Ib chem unit 3 Flashcards
What name is group 1
Alkali metals
What group name is 2
Alkaline earth metals
What group name is 15
Pnictogens
What group name is 16
Chalcogens
What group name is 17
Halogens
What group name is 18
Noble gases
Name 4 characteristics of metals
-conductors of heat and electricity
-malleable (capable of being hammered into sheets)
-ductile (capable of being drawn into wires
-lustre (shiny)
are non-metals good conductors of heat and electricity
No they bad
What’s us a reduced reaction
When non-metals gain electrons in chemical reactions
What’s a oxidized reaction
When metal lose electrons chemical reactions
What are two semiconductors and why
-silicon
-germanium
Highly temp déposé dans electrical conductivity
What is ionization energy?
IE is minimum energy required to remove an electron from a neutral gadoues atom in its gas state
What’s electron affinity
-energy required to detach an electron from the singly charged negative ion in the gas phase
Is electron affinity exothermic or endothermic
Exothermic cuz negative sign on top of e in the equation represents energy released
Is ionization energy exothermic or endothermic
Endothermic
What does having a greater E value suggest?
The greater the attraction of the ion for the electron
Why do metals have low ionization energy?
Cuz they have a tendency to lose electrons during a chemical reaction and tend to be oxidized
Why are non metals known to show highly negative electron affinities?
-have tendency to gain electrons during a chemical reaction and are reduced
Why do ionic compounds have high melting and boiling points?
Cuz of the strong electrostatic forces of attraction between the ions and their lattice structures
Volatility
Refers to the tendency of a substance to vaporize
Volatility in ionic compounds
-electrostatic forces of attraction are storing and so the volatility is very low
Electrical conductivity in ions and ionic compounds during solid state
-in ionic compounds in the solid state the ions occupy fixed positions
-therefore not free to move in solid state
-which means they cannot conduct electricity
-but in the molten state they are free to move so they can
Two uses of ionic liquids
-are efficient solvents and electrolytes
-used in electric power sources and green industrial processes
Give 4 examples of coordinate covalent bonding compounds
1) [NH4]+
2) [H3O]+
3) CO
4) Al2Cl6
