2.1 atoms and reactions

Question 1

Define an isotope

Answer 1

atoms of elements Have the same atomic number but different numbers of neutrons

Question 2

Why are reactions of isotopes the same

Answer 2

Because they still have the same electron arrangement and number of shells

Question 3

Define relative atomic mass

Answer 3

mean weighted mass of an atom of an element relative to 1/12th the mass of a carbon 12 atom

Question 4

Define relative isotopic mass

Answer 4

The weighted mass of an isotope compared to 1/12th of a carbon 12 atom

Question 5

What is avogadros constant

Answer 5

Number of atoms in a mole 6.02*10**23

Question 6

How do you calculate amounts using gas volumes

Answer 6

moles = volume /24

Question 7

What is the ideal gas equation

Answer 7

pV =nRT

Question 8

What is the equation for concentration

Answer 8

c = m/ v

Question 9

what is the difference between an alkali and a base

Answer 9

A base is a proton acceptor and an alkali can dissolve in water to form aqueous hydroxide ions

Question 10

What is a salt

Answer 10

When a compound has had the H+ replaced by a metal ion

Question 11

What does .XH2O mean

Answer 11

The relative number of water molecules of crystillisation

Question 12

Define water of crystallisation

Answer 12

refers to water molecules that make up an essential part of the crystaline structure of a compound