2.1.2 Compounds, formulae and equations

Question 1

Define ion

Answer 1

an atom with a charge due to loss or gain of electrons

Question 2

Nitrate ion

Answer 2

NO3–

Question 3

Carbonate ion

Answer 3

CO3 2-

Question 4

Sulfate ion

Answer 4

SO4 2-

Question 5

Hydroxide ion

Answer 5

OH-

Question 6

Ammonium ion

Answer 6

NH 4+

Question 7

Zinc ion

Answer 7

Zn 2+

Question 8

Silver ion

Answer 8

Ag +

Question 9

How do you write the formula of an ionic compound ?

Answer 9

Lithium sulfate
* identify the ion charges
(Li + and SO4 2-)
* Add small numbers to ensure that the overall compound is neutral (charges cancel out)
(Li **2 **SO4

Question 10

What do ionic equations show ?

Answer 10

only show ions involved in the reaction NOT the spectator ions
(Spectator ions do not change state or oxidation numbers)

Question 11

How do you write an ionic equation?

Answer 11

• Write out the symbol equation ensuring it is balanced
• Write out the IONS and their charges
• Remove** spectator ions** (Ones that are the same on both sides
• Write out the new formula using the ions remaining

ONLY aqueous ionic compounds can split into their ions NOT SOLIDS OR LIQUIDS
Aqueous includes: soluble ionic compounds AND strong acids and bases