2.3 Formulae and equations Flashcards
1
Q
Are atoms of metals anions or cations?
A
Metal atoms are cations (lost an electron)
2
Q
Do noble gases form ions? Why?
A
No, they are stable and have a full outer shell
3
Q
What is a binary compound?
A
A compound containing two elements
4
Q
How do you write a binary compound?
A
- Use the first elements name
- Use the second elements name and replace the ending with -ide
5
Q
Do you write a metal ion first or second in a binary compound?
A
Metal ion comes first
6
Q
What is a polyatomic ion?
A
An ion that contains atoms of more than one element bonded together
7
Q
Give an example of a polyatomic ion
A
NH4^+
OH^-
CO3^2-
8
Q
What is a formula unit and when is it used?
A
- The formula worked out from the ionic charges
- Used in equations
9
Q
Nitrate ion
A
NO3-
10
Q
Carbonate
A
CO3^2-
11
Q
Ammonium
A
NH4+
12
Q
Silver
A
Ag+
13
Q
Sulfate
A
SO4^2-
14
Q
Hydroxide
A
OH-
15
Q
Zinc
A
ZN^2+
