Ib chem unit 3

Question 1

What name is group 1

Answer 1

Alkali metals

Question 2

What group name is 2

Answer 2

Alkaline earth metals

Question 3

What group name is 15

Answer 3

Pnictogens

Question 4

What group name is 16

Answer 4

Chalcogens

Question 5

What group name is 17

Answer 5

Halogens

Question 6

What group name is 18

Answer 6

Noble gases

Question 7

Name 4 characteristics of metals

Answer 7

-conductors of heat and electricity
-malleable (capable of being hammered into sheets)
-ductile (capable of being drawn into wires
-lustre (shiny)

Question 8

are non-metals good conductors of heat and electricity

Answer 8

No they bad

Question 9

What’s us a reduced reaction

Answer 9

When non-metals gain electrons in chemical reactions

Question 10

What’s a oxidized reaction

Answer 10

When metal lose electrons chemical reactions

Question 11

What are two semiconductors and why

Answer 11

-silicon
-germanium
Highly temp déposé dans electrical conductivity

Question 12

What is ionization energy?

Answer 12

IE is minimum energy required to remove an electron from a neutral gadoues atom in its gas state

Question 13

What’s electron affinity

Answer 13

-energy required to detach an electron from the singly charged negative ion in the gas phase

Question 14

Is electron affinity exothermic or endothermic

Answer 14

Exothermic cuz negative sign on top of e in the equation represents energy released

Question 15

Is ionization energy exothermic or endothermic

Answer 15

Endothermic

Question 16

What does having a greater E value suggest?

Answer 16

The greater the attraction of the ion for the electron

Question 17

Why do metals have low ionization energy?

Answer 17

Cuz they have a tendency to lose electrons during a chemical reaction and tend to be oxidized

Question 18

Why are non metals known to show highly negative electron affinities?

Answer 18

-have tendency to gain electrons during a chemical reaction and are reduced

Question 19

Why do ionic compounds have high melting and boiling points?

Answer 19

Cuz of the strong electrostatic forces of attraction between the ions and their lattice structures

Question 20

Volatility

Answer 20

Refers to the tendency of a substance to vaporize

Question 21

Volatility in ionic compounds

Answer 21

-electrostatic forces of attraction are storing and so the volatility is very low

Question 22

Electrical conductivity in ions and ionic compounds during solid state

Answer 22

-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

Question 23

Two uses of ionic liquids

Answer 23

-are efficient solvents and electrolytes
-used in electric power sources and green industrial processes

Question 24

Give 4 examples of coordinate covalent bonding compounds

Answer 24

1) [NH4]+
2) [H3O]+
3) CO
4) Al2Cl6