Chapter 8

Question 1

What are chemical formulas

Answer 1

shows elements and their ratios

Question 2

Are metals wriiten first or non metals

Answer 2

metals

Question 3

What are polyatomic ions

Answer 3

a group of atoms join together to form an ion

Non metals usually

Question 4

Give 2 examples of negative polyatomic ions

Answer 4

Carbonate and hydroxide

Question 5

Give an example of a positive polyatomic ion

Answer 5

Ammonium

Question 6

what is the law of definite proportions

Answer 6

A specific compound always contains the same elements in definite proportions

Question 7

What are ionic compounds

Answer 7

When a metal combines with a non metal , electrons are transferred to form ions which are bonded by electrical force to form compounds

Question 8

Are ionic compound positive or negative or neutral

Answer 8

neutral

Question 9

What does being a multivalent element mean

Answer 9

multivalent means it has more than one ion charge .

Question 10

Which elements are multivalent and gives examples of common ones

Answer 10

Multivalents elements are not in the 1 &2 group and are found after the atomic number 20

Examples are Chromium(II)

Chromium (III)

Copper(I)

Copper(II)

Iron(II)

Iron(III)

Lead(II)
Lead(IV)

Nickel(II)

Nickel(III)

Question 11

What are monovalent elements

Answer 11

They can lose or gain electrons in only one way

Question 12

Do 2 multivalent compounds have the same properties

Answer 12

no

Question 14

What indicates the ion charge in multivalent ions

Answer 14

The name like Copper(II) has an ion charge of 2+

Question 15

What are the rules when writing the name of compounds

Answer 15

you dont write the ion charge of a monovalent element

metal writen first then non metal

written lowercase and spelld perfectly

the non metal is given the sufffix ide

Question 16

When writing the non metal in a polyatomic ions , do we add ide to it

Answer 16

no

Question 17

What are the rules for naming multivalent compounds

Answer 17

Ion charge must be in the name in form of roman numeral enclosed in brackets without any space between the name & number

Question 18

What are chemical families

Answer 18

group of elements with same properties and from compounds with similar properties

Question 19

Describe Alkali metals and their properties

Answer 19

First column of periodic table(Not hydrogen)

Group 1

Includes Lithium , sodium,potassium,rubidium, cesium and francium

Have an charge of 1 +

soft, low density metals

very reactive

good conductors

solid at room temp

Question 20

What are some uses of alkali metals

Answer 20

Alkali metals are founds as ions in salt deposits,produce hydrogen and an alkaline solution, lithium is used in light weight batteries , sodium used to manufacture other chemicals and pottasium is used in fertilizers

Question 21

Describe Alkaline earth metals and their properties

Answer 21

second column of the periodic table

group 2

Includes beryllium,magnesium , calcium, Strontium , Barium and radium

Ion charge of 2+

metals

hard

low density

react with air and water

good conductors

solid at room temp

Question 22

What are some uses of alkaline earth metals

Answer 22

ions in rock minerals, magnesium used in flash powder and fireworks ,magnesium and beryllium used as idustrial alloys

Question 23

Describe Halogens and their properties

Answer 23

Group 17

includes fluorine, chlorine, bromine,iodine and astatine

ion charge of 1-

non metals

very reactive

found in compounds in nature

toxic in elemental form

Have bright colours as gases

Question 24

What are some uses of halogens

Answer 24

industrial chemicals like chlorine , fluorine is used in toothpaste , iodine is a common disinfectant

Question 25

Describe noble gases and their properties

Answer 25

Group 18

inccludes heium , neon, argon,krypton, xenon and radon

non reactive since full shells

ion charge of 0

tasteless, odourless and colourless

form bright colours when heated

non toxic (except radon)

Question 26

What are some uses of noble gases

Answer 26

Helium is used for lifting ballooons and blimps, neon used for neon signs , argon , krypton and xenon used to fill light bulbs

Question 27

Why is hydrogen called a family of one

Answer 27

Hydrogen can either give up an electron or acquire an electron. therefore it can be negative or positive which results in being a highly reactive metal or a highly reactive non metal.