Writing Chemical Formulae Flashcards
(15 cards)
What is the chemical formula of a covalent molecular substance?
It shows a number of atoms of each element in the molecules.
What is the chemical formula of a covalent network?
It is the simplest ratio of the different types of atom in the structure
What is an ionic compounds formula?
The simplest ratio of the ions in the structure and can be written with or without ionic charges.
How can a chemical formula be worked out?
By using the symbol, valency, swap, divide, formula method.
What are the prefix number of atoms?
Mono – one
Di – two
Tri – three return
Tetra – four
Penta – five
Hexa – six
What does the ending -ate and -ite mean?
That oxygen is present and three or more elements are present.
What does the ending –ide mean?
But two elements are present.
What are the valency’s of each group?
Group 1 – one
Group 2–2
Group 3–3
Group 4–4
Group 5–5
Group 6–2
Group 7–1
Group8–0
What is Valency?
Wiltsie is the combining power of an element it is related to how many electrons are in the outer shell.
What is a group ion?
A group ion contains two or more atoms and usually have a negative charge.
How do you get the valency of a group ion?
You take the charge on the ion as the valancy
How do you know the valency of a metal?
The valency is shown by placing a Roman Numeral after the name.
What is the valency of zinc always?
The valency of zinc is always two.
What is the ionic formula?
It is the same as the chemical formula just with the charges of the ions.
When is a chemical equation balanced?
It is balanced when there are the same number of the same type of every element on both sides of the equation.
