chemsifry
explain oxidation in terms of oxygen
gain of oxygen atoms
explain reduction in terms of oxygen
loss of oxygen atoms
explain oxidation in terms of electrons
loss of electrons
explain reduction in terms of electrons
gain of electrons
what are ores
rocks containing good perecentage of metal compound
why is gold found as pure metal
very unreactive
how can elecrolyisis be used to extract metals
can split molten metal compounds into its elements using electricity
what would you observe if you added sodium to water
fizzing sodium floats reacts and dissolves
what is a displacement reaction
metal sill displace a less reactive metal is a salt metal solution
According to the provided notes, what is the approximate size of an atomic nucleus?
1 x 10^-14 m
In the balanced equation 4 Al + 3O2 -> 2 Al2O3, what is the coefficient for oxygen gas (O2)?
3
What does the 'atomic number' (bottom number) of an element like K (19) represent?
The number of protons.
For an atom of K (Potassium) with an atomic number of 19 and a mass number of 39, how many protons are present?
19 protons
In the balanced chemical equation 4 Al + 3O2 -> 2 Al2O3, how many atoms of aluminum are involved as reactants?
4
In the compound MgSO4, how many different elements are present?
Three elements
For an atom of K (Potassium) with an atomic number of 19 and a mass number of 39, how many neutrons are present?
20
Which scientist proposed the "Plum Pudding" model of the atom?
JJ Thomson
How does a compound differ from a mixture regarding chemical bonding?
A mixture contains more than one substance, but they are not chemically bonded
What is the charge of a proton?
+1
Which subatomic particle was discovered by Chadwick?
Neutron
Define an element based on the provided notes.
A substance made from one type of atom.
What type of particles did Rutherford fire at gold foil in his scattering experiment?
positive alpha particles
A substance made from one type of atom is called a/an:
element
Name the subatomic particle with a negative charge and a mass of approximately 1/2000.
electron
What is the approximate diameter of an atom?
1 x 10^-10 m
How many total atoms are present in one molecule of MgSO4?
6
For an atom of K (Potassium) with an atomic number of 19 and a mass number of 39, how many electrons are present in a neutral atom?
19 electrons
Which model of the atom describes a spherical cloud of positive charge with electrons embedded within it?
Plum Pudding model
What is the electron configuration for an atom that has 13 electrons?
2, 8, 3
What term describes more than one type of atom chemically bonded in a fixed ratio?
A compound
Why are Group 0 elements considered unreactive?
They have a full outer shell of electrons
What is the mass of a neutron relative to a proton?
1
What characteristic differentiates a compound from a mixture based on the notes?
Compounds are chemically bonded
What term is used for the total number of protons and neutrons in an atom's nucleus?
Mass number