Fechar
Endothermic reaction
Exothermic reaction
Electrolysis
Oxidation
Neutralisation
Thermal decomposition
Which one:
The bag gets cold because heat energy is given out to the surroundings.
The bag gets cold because heat energy is taken in from the surroundings.
The bag gets cold because plastic is a good insulator.
Which word best describes the change when ammonium nitrate dissolves in water.
Why is the ice pack shaken after the inner bag has burst.
The manganese(IV) oxide has lowered the...
activation energy
boiling point
temperature
27
Al
13
Number of Protons...
Number of Neutrons...
Number of Electrons...
Why is aluminium positioned in the group 3 of the periodic table?
Why does iodine have a higher boiling point than chlorine?
Which one:
Iodine is ionic and chlorine is covalent.
Iodine is less reactive than chlorine.
The covalent between iodine atoms are stronger.-the forces between iodine molecules are stronger.
Cl2(aq) + 2Kl(aq) --> l2 (aq) + 2KCl(aq)
What us the colour of the final solution in this reaction?
Brown
Orange
Pale Green
Colourless
What is the ionic equation for the reaction of chlorine with potassium iodide?
Cl2 + 2K --> 2KCl
2l- + Cl2 --> l2 + 2Cl-
l- + Cl --> l + Cl-
l- + K+ -> Kl
Why does potassium iodide solution conduct electricity?
It contains a metal.
It contains electrons which can move.
It contains ions which can move.
It contains water.
What is the electron arrangement of a chlorine atom.
State one property that makes aluminium more suitable then copper for overhead cables.
C2
Complete each sentence...
The mass number of this nitrogen atom is...
Atoms of nitrogen with different numbers of neutrons are called...
Compared with a proton, the mass of an electron is...
What is the correct formula of ammonia?
Name the monomer used to make polymer poly(propene).
