Grade 10 Science - Naming Ions

Question 1

What method do you use to write the formulas for compounds?

Answer 1

The ‘criss-corss’ rule

Question 2

What is the ‘Criss-Cross’ method?

Answer 2

When you swap the charges of 2 elements and then put them together

Question 3

How do you write the name of each iconic compound when given the formula?

Answer 3

You put the metal first then you put the gas and change the ending to ‘ide’

Question 4

When do you add roman numeral between the metal and the gas/polyatomic ions?

Answer 4

When the metal is a multivalent ionic compound?

Question 5

What’s the difference between a metal ionic compound and a multivalent ionic compound?

Answer 5

Metal ionic compound only have 1 possible charge while multivalent ionic’s have multiple possible charges

Question 6

How do you know what to write in for the roman numerals?

Answer 6

It’s basically the number needed to make both the metal and the gas/Polyatomic ions opposite charges when multiplied

Question 7

How do you convert a compound name with/without roman numeral to the proper formula?

Answer 7

If it has a roman numeral you put the number after the gas/polynomial ionic. If it doesn’t then you check the charges of both metal and gas/polynomial and multiply either the metal or the gas/polynomial in order to make both have opposite charges

Question 8

What is the only polynomial ion that can be combined with other polynomial ions and why?

Answer 8

Ammonium because it’s the only polynomial that has a positive charge

Question 9

What does HOBrFINCl

Answer 9

1. Hydrogen
2. Oxygen
3. Bromine
4. Fluorine
5. Iodine
6. Nitrogen
7. Chlorine

Question 10

What is the acronym for the 7 special elements?

Answer 10

HOBrFINCl

Question 11

What makes the elements in HOBrFINCl so specials?

Answer 11

because when they are alone they are in pair of 2