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C2H4 and H2 were reacted to form C2H6. Using the formulas of the substance, state if a new compound has been formed.

Yes, a new compound has been made as the atoms in C2H6 are in different proportions as they were in the previous compounds.


Argon can be separated from air. will the chemical properties of argon be different in air and in its pure form.

no, the properties will be the same as argon is only an element in a mixture and chemical properties are not affected by being in a mixture.


Describe 3 similarities between the plum pudding model and the nuclear model of the atom.

they both have areas of positive charge they both have electrons they are both neutral overall


Describe 3 differences between the plum pudding model and the nuclear model of the atom.

-Plum pudding model does not have neutrons or protons. it only has electrons surrounded by a positive charge. -Plum pudding doesn't have shells of electrons as the electrons are arranged randomly -Modern nuclear model has a concentrated mass but plum pudding model has an evenly spread mass.


Both of calciums electrons are in the innermost shell. why is this.

The electrons in an atom occupy the innermost sell first which can hold 2 electrons


How did the discovery of isotopes explain why atomic weights dont always give the correct order of elements.

isotopes have a different number of neutrons but the same chemical properties. This means they give different mass readings which don't always coincide with the correct order of elements.


Why is the table caled the periodic table?

similar properties occur at regular intervals


Study Element X


What group is element X in and why.

2nd group because it has 2 outer shell electrons


Study element X


What period is element X in and why.

3rd period because it has 3 shells of electrons


Where are metals found on the periodic table?

bottom and left


Where are non metals found on the periodic table?

right and top


Suggest 1 physical property that magnesium and aluminium have in common.


electrical conductivity



Compare the physical properties of iron and sulfur.

iron is a strong shiny metal, sulfur is a briittle powder

iron has a high melting point, sulfur has a low melting pont

iron conducts, sulfur doesnt


What happens to melting point as you go down group 1?

it decreases


Compare the reactivity of francium to caesium. justify your answer using electron arrangement.

francium is more reactive than caesium because the further down the group you go, the further the outer shell is from the nucleus. this means the attraction decreases so the lectron is more easily lost.


Compare the chemical reactivity of chlorine and bromine

Chlorine is more reactive than bromine. this is because chlorines outer shell closer to the nucleus so its easier for chlorine to gain an electron when it reacts


Wll chlorine water react with potassium fluoride soloution?


chlorine is less reactive than fluorine so it wont displace it


Dscrible the electronic structure of halogens and explain how it changes down group 7

the halogens have 7 elecrons in their outer shell. as you go further down the group additional shells are added so the outer shell is further from the nucleus


Explain the chemical reactivity of Krypton in terms of electron configuration 

Krypton is unreactive. It has a stable electron arrangement / full outer shell.


In group 0 what happens to boiling points as you go down the group? 

Boiling points increase as you go further down the group. 


In group 7 elements what happens to boiling points as you go down 

The boiling points increase


Why is it unlikely that iodine would form a compound with xenon?

Iodine is much less reavtive than fluorine