UNIT 1 EXAM

Question 1

chromium and copper - atypical electron configurations

Answer 1

chromium - 1s2 2s2 2p6 3s2 3p6 3d4 4s2

copper - 1s2 2s2 2p6 3s2 3p6 3d9 4s2

Question 2

periodic trends in atomic size

Answer 2

atomic size decreases across the periodic table and increases down the groups

Question 3

periodic trends in electronegativity

Answer 3

electronegativity generally increases across a period and decreases down a group

Question 4

periodic trends in metallic character

Answer 4

metallic character decreases across a period and increases down a group

Question 5

periodic trends in metallic character

Answer 5

metallic character decreases across a period and increases down a group

Question 6

chemical bond

Answer 6

the forces between atoms in chemical bonds are electrostatic

Question 7

3 way in which atoms can become stable

Answer 7

• giving electrons
• taking electrons
• sharing electrons

Question 8

ionic network lattice

Answer 8

three-dimensional arrays of cations and anions

Question 9

properties of ionic lattices

Answer 9

• are hard
• dissolved water to form ions
• conduct electricity when molten or in aqueous solution
• are brittle

Question 10

empirical formula

Answer 10

the simplest ratio of ions in the ionic lattice

Question 11

properties of ionic lattices

Answer 11

• are hard
• dissolved water to form ions
• conduct electricity when molten or in aqueous solution
• are brittle
• crystalline solids
• high melting and boiling points
• do not conduct electricity in solid form

Question 12

empirical formula

Answer 12

simplest whole number ratio of atoms or ions

Question 13

binary

Answer 13

a binary compound only contains two elements

Question 14

polyatomic ions

Answer 14

a bound group of atoms with and overall charge

Question 15

properties of metals

Answer 15

• lustrous (shiny)
• good conductors of heat and electricity
• malleable
• ductile
• high density
• often high
• generally have high melting points

Question 16

annealing

Answer 16

metals are heated until they are red hot and then cooled slowly . larger metal crystals are formed so that the metal produced is softer. it is used to restore ductility lost due to work hardening.

Question 17

tempering

Answer 17

metals are produced when quenched metals are warmed again to a lower temperature then allowed to cool slowly. this procedure reduces the brittleness of the metal while retaining its hardness.

Question 18

quenching

Answer 18

metals are heated until they are red hot and then cooled quickly in cold water. smaller crystals are formed which makes the metal harder but more brittle.