Chapter 3 ( Chemical Equations + Basics )

Question 1

Why do metal ions for cations?

Answer 1

Metals have a sea of delocalised electrons which they need to lose in order to achieve stable noble gas configuration. Hence when they have more protons then electrons their charge is positive as proton is positive 1 charge

Question 2

Why non metal ions form anions?

Answer 2

non metals need electrons from metals to achieve stable noble gas configuration -> anions = electrons > protons

Question 3

What are polyatomic ions?

Answer 3

made of one or more atoms covalently bonded together and their overall charge is their overall valency

Question 4

What are molecules?

Answer 4

molecules refer to two or more atoms chemically combined to form the smallest unit of a substance that retains the substance’s chemical properties and composition

Question 5

Speciality of ionic equations?

Answer 5

involve at least one aqueous reactant (on LHS) that is usually an ionic compound
show the ions that take part in the reaction

Question 6

What does the arrow in equation show?

Answer 6

That the reactants on LHS have COMPLETELY REACTED into the proudests on RHS

Question 7

What charge does iron (III) have and how do you know?

Answer 7

The stupid Roman numerals give it away, charge of 3+ ( positive because metal )