Cada pregunta de este test está cronometrada.
Number of moles= Volume/24
Number of moles= volume X concentration
Number of moles= mass/mr
0 degrees kelvin= 273 degrees celsius
1 moles= 6.022 X 10^23
The nucleus is made up of?
Protons, neutrons & electrons
Neutrons & protons
Protons
A: The mass number (nucleon number) tells you?
Number of protons
Number of protons and neutrons
Number of protons, neutrons and electrons
Z: Atomic (proton) number tells you?
Total number of protons and neutrons.
Number of protons.
Isotopes are atoms of the same element with a different number of neutrons.
Isotopes have the same mass numbers.
Between isotopes chemical properties vary but physical properties are the same.
Relative atomic mass (Ar)
the amount of any substance containing as many particles as there are carbon atoms in exactly 12g of the C-12 isotope.
weighted mean mass of an atom of an element compared with 1/12 of the mass of a C-12 atom.
mass per mole of a substance (g/mol)
Acids (proton donor, H+ ions being the active ingredient)
HCL
MgO
NaOH
H2SO4
Bases (proton acceptors)
Metal Oxides and hydroxide
White solutions
Ammonia
Amines
Alkalis are insoluble bases.
A salt is an ionic chemical compound.
A positive ion is known as a?
Cation
Anion
A salt is produced when an acid is neutralised with?
A carbonate
A base
An alkali
Ammonium salts can be used as artificial fertilisers.
The oxidation state of a free element is it's group number.
The sum of the oxidation states in a molecule= number of atoms in the molecule.
Oxidation is the?
loss of electrons
gaining of electrons
After reduction the oxidation state?
decreases
increases
A reducing agent is oxidised in the reaction.
Monatomic ions oxidation states is their charge.
