What are isotopes?
Different forms of the same element which have the same number of protons and a different number of neutrons.
Different forms of the same element which have the same number of protons and a same number of neutrons.
Different forms of the same element which have the different number of protons and a same number of neutrons.
what is ionic bonding?
transfer of electrons to form charged atoms
Sharing electrons to form a full outer shell
Ionic compounds have a regular lattice structure.
Silver Chloride is soluble.
Tick all correct flame tests.
Sodium ions give an orange/yellow flame
Sodium ions give an pink flame
potassium ions give a red flame
potassium give a lilac flame
calcium ions give a blue flame
Copper ions give a bluey-green flame
Barium sulfate, used in x-rays is swallowed by patients in barium meals. It is toxic.
How do you test for carbonates, for example Carbon dioxide?
Add dilute HCL and barium chloride solution. A white precipitate means Carbon dioxide is there.
Bubble it through limewater, if it's carbon dioxide it will go cloudy.
flame test it! If it turns white its Carbon dioxide
Simple molecular covalent substances have which of these characteristics?
Very strong covalent bonds form small molecules of two or more atoms.
Very weak inter-molecular forces.
High melting and boiling points.
Conducts electricity.
Giant Molecular Covalent Substances have which of these characteristics, tick all the correct answers.
They're similar to ionic lattices.
They're soluble in water.
(except for graphite). Don't conduct electricity.
Diamond and Graphite are main examples.
which process is better for separating miscible ( mixable) mixtures, separating funnels or fractional distillation?
Separating funnels.
Fractional distillation.
Alkali metals ( in group one of the periodic table) have which properties?
react vigorously with water.
The further you go down in the group, the more reactive they get.
Reaction with water produces carbon dioxide
When bonds break they form an endothermic reaction.
Which four things can increase the rate of reaction?
Surface area
concentration
how heavy the object is
a catalyst
temperature
covering it with a hat
select the correct answers.
The relative atomic mass is the same as the elements mass number.
The relative atomic mass is the same as the elements atomic number
Relative formula mass is all the relative atomic masses in that compound added together.
Por favor, aguarde! Carregando...