Topic1 - Atoms, Ions And Electronic Structure

Question 1

Define isotope

Answer 1

Atoms of the same element with same number of protons different number of neutrons

Question 2

What is the atomic number?

Answer 2

Number of protons

Question 3

What is the relative atomic mass?

Answer 3

Number of protons and neutrons

Question 4

Define relative isotopic mass

Answer 4

The mass of an atom of a single isotope relative to 1/12th of a 12C atom

Question 5

Define Relative atomic mass

Answer 5

The weighted mean mass of an atom of an element relative to 1/12th of a 12C atom, taking into account isotopic abundance

Question 6

What is mass spectrometry?

Answer 6

A machine that gives you the abundance of an element

Question 7

How do u calculate the relative atomic mass (Ar) of an isotope

Answer 7

(Isotopic mass x abundance) + (isotopic mass x abundance) / 100

Question 8

What is the formula for a hydroxide ion

Answer 8

OH-

Question 9

What is the formula for a nitrate ion?

Answer 9

NO3-

Question 10

What is the formula for a sulfate ion

Answer 10

SO4 2-

Question 11

What is the formula for a carbonate ion?

Answer 11

CO3 2-

Question 12

Why do different isotopes have the same chemical properties?

Answer 12

Because they have the same number of electrons

Question 13

What are ionic equations?

Answer 13

Are chemical reactions for a reaction that lists only those species participating in the reaction
E.g if anything changes in the reaction it’s shown in the ionic equation

Question 14

What is the ionic equation for NaOH(aq) + HCl(aq) -> NaCl(aq) + H2O(l)

Answer 14

Ions can only separate if they are aqueous
Na+(aq) + OH-(aq) + H+(aq) + Cl-(aq) -> Na+(aq) + Cl-(aq) + H2O(l)
Na+(aq) Cl-(aq) -> Na+(aq) Cl-(aq) ARE SPECTATOR IONS - don’t include in equation

OH-(aq) + H+(aq) -> H2O(l)

Question 15

When writing chemical equations what state symbols do you use for salt and acids?

Answer 15

Aqueous (aq)