Chemical Formulae + Valency

Question 1

How are compound names created

Answer 1

it is derived from the names of the elements from which they are formed

Question 2

What does it usually mean when a compound ends in -ide

Answer 2

it will contain the two elements indicated

Question 3

What does the ending -ite or -ate indicate

Answer 3

oxygen is present

Question 4

How can chemical formulae be written for two element compounds

Answer 4

you can write it using the valency rule and a Periodic Table

Question 5

How can chemical formula be determined using only its name

Answer 5

by using the prefix rule

Question 6

What does mono mean

Answer 6

1

Question 7

What does di mean

Answer 7

2

Question 8

What does tri mean

Answer 8

3

Question 9

What does tetra mean

Answer 9

4

Question 10

What does penta mean

Answer 10

5

Question 11

What does hexa mean

Answer 11

6

Question 12

What do roman numerals indicate

Answer 12

the valency of an element

Question 13

What does the valence number of an atom indicate

Answer 13

number of bonds an atom can make

Question 14

How do you write the formulae for complex ion

Answer 14

select symbols
add brackets to complex ions
cross valency
write formula

Question 15

What does the charge on a complex group ion tell us

Answer 15

the valence number of the ion

Question 16

How can you tell if a compound contains complex group ions

Answer 16

if it ends in -ate or -ite

Question 17

How does the group number relate to the charge on an ion

Answer 17

Group number - Charge on ion 
1 - 1+
2 - 2+
3 - 3+
5 - 3-
6 - 2-
7 - 1-

Question 18

How do you write ionic formula

Answer 18

select symbols including charges 
add brackets to both ions
cross valency 
cancel down valencies if possible 
write formula