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Chemistry
GCSE

Bromine has an atomic number of 35 but has two stable isotopes- bromine-79 and bromine-81. Given that 51% of bromine atoms are bromine-79 and 49% are bromine-81%, work out the relative atomic mass of bromine to the nearest whole number.

What is an isotope? (To ensure the students basic understanding on isotopes) Isotopes are different atomic forms of the same element, which have same number of protons but different numbe...

Answered by Mehek S. Chemistry tutor
15938 Views

Why can graphite conduct electricity but diamond can’t even though they are both purely made of carbon?

Though graphite and diamond are made of only carbon, they both have a different structure. The structure of Graphite consists of carbon atoms covalently bonded to...

Answered by Diana T. Chemistry tutor
8601 Views

Calculate the number of moles in 23.0g of CO2? ( relative atomic mass : Carbon=12, Oxygen=16)

Firstly we need to work out the molecular mass of CO2 . There is one carbon and two oxygens so we have to add the relative atomic mass (Ar) of one carbon and two oxygens. From the quest...

Answered by Dilan B. Chemistry tutor
5119 Views

Give an advantage of hard water.

Hard water tastes better.

Answered by Angus B. Chemistry tutor
1702 Views

You have 10g of Sodium Carbonate, how many moles do I have to 2dp?

Sodium Carbonate is Na2CO3The molecular formula mass is 2xNa + 1xC + 3xO 2x23 + 1x12 + 3x16 = 106 g/mol m = 10g Mr = 106 g/moln=m/Mrn = 10/106 = 0.09 mol

Answered by Sophie B. Chemistry tutor
3462 Views

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