Alkenes Flashcards
What is meant by the term isotopes?
An atom with the same number of protons but a different number of neutrons
Different isotopes have the same chemical properties. Explain why?
Chemical properties depend on the number of outer electrons, so are the same in each isotope.
Define the term relative atomic mass.
Weighted mean mass of an atom of an element compared to 1/12 the mass of a C-12 isotope.
What is the empirical formula?
The simplest formula for a compound.
What is the molecular formula?
The same as or a multiple of the empirical formula based on the actual number of atoms of each type in the compound.
How do you calculate the Molar mass in a compound?
mass (g) / number of moles?
How do you calculate the mass (g) of a compound?
number of moles x Molar Mass
How do you calculate the number of moles in a compound?
mass (g) / molar mass
How do you calculate the concentration of a substance?
number of moles / volume
How do you calculate the volume of a solution?
number of moles x 24
Acid + Alkali
Salt + H2O
What is a Base?
The opposite of an acid, a proton acceptor. They neutralise acids
What is an acid
All acids contain Hydrogen when an acid is added to water, the acid releases hydrogen ions into the solution. A proton donor.
What is an alkali?
An alkali is a base that dissolves in water forming hydroxide ions. A soluble base.
What is a salt?
A salt is a chemical compound produced when an H+ ion from an acid is replaced by a metal positive ion or an ammonium ion.
