chemistry

Question 1

Precipitation reactions

Answer 1

When 2 solution mix to form an insoluble solid, tis happens between 2 ionic compounds (soluble + insoluble) in solution, the precipitate falls out of the solution as a solid.

Question 2

Properties of alkaline earth

Answer 2

Hotter metal in room temp, middle conductivity and density, ionic form is +2 (group 2)

Question 3

Properties of transition metal

Answer 3

Can from different oxidation state, high conductivity and density, has high melting point

Question 4

Properties of halogens

Answer 4

Nonmetal element, in room temp gas is fluorine and chlorine, liquid is bromine, solid is iodine and Antonine, (group 17.)

Question 5

Electron configuration

Answer 5

How electrons are arranged in orbitals around an atoms nucleus and determines how it’ll interact with other atoms, atoms are also most stable with full outer shell (8)

Question 6

What is ionic bonding

Answer 6

Metal loses an electrons and becomes an cation (negative ion), nonmetals gain electron to become an anion (negative ion), the opposite charges attract and ionic bonds form

Question 7

Covalent bonding

Answer 7

Atoms share electrons to fill their outer shells

Question 8

Exothermic reaction

Answer 8

Energy is released to surroundings by heat or light, the surroundings becomes hotter

Question 9

Endothermic reaction

Answer 9

Energy is absorbed form the surroundings, surroundings become cooler

Question 10

Oxidation corrosion

Answer 10

When a substance is reacting to oxygen, it has a slow reaction with oxygen and water, mainly happens to metals like iron, forms a new compound which is rust.

Question 11

Oxidation combustion

Answer 11

When a substance reacts to oxygen, has a fast reaction with oxygen, produces heat, light, Co2, and H2o.

Question 12

Ions

Answer 12

Charged atoms due to the sharing of electrons (gain or lose)

Question 13

Displacement reaction

Answer 13

Chemical reaction that pushes out the metal that is the least reactive and replaces it with more reactive metal.

Question 14

Period

Answer 14

Number of energy shells (and is the horizontal row on periodic table)

Question 15

Atomic radius

Answer 15

Size of atom according to period (number of energy shells)

Question 16

Groups

Answer 16

Number of electron in outermost shell

Question 17

Reactivity

Answer 17

The stability of atoms (2,8,8 is a full valence shell)

Question 18

Difference between trend and period

Answer 18

Period is horizontal row, whilst trends are the repeating patterns of properties across groups

Question 19

Properties of alkali metals

Answer 19

Soft metals in solid forms, low conductivity and density, and ionic form is +1 (group 1)

Question 20

Properties of metallic elements

Answer 20

Bellow metalloids on periodic table, most are soft and brittle with poor mechanical strength, has lower melting point from groups 3-12

Question 21

Properties of metalloids

Answer 21

Above metallic elements on periodic table, chemical and physical properties mix between metal and nonmetal

Question 22

Bonding happens because

Answer 22

Atoms want to achieve full outer shell to become stable, they do this by transferring or sharing electrons and they all occur between metal and nonmetal