Catalyst was magnesium oxide
one of the answers were Equation 2 because moles were both 0.04
i got mass of oxygen to be 144kg
polysterene cup is used to prevent heat escaping

Reply 66

KingKongsDong

I got 0.155 what did I do wrong

Reply 67

Gingerwave

Phew I think I changed it to that last minute

Original post by Wirral21

Relative atomic mass

Reply 68

Gingerwave

My calculator broke mid exam was so stressful luckily got given another one but it was bad

Reply 69

deepakbaji

Original post by OptimisticMedic

What did you guys get for the question before the one where it said whether equation 1 or 2 was right?

2 because it obeyed the law of conservation of mass

Reply 70

Gingerwave

How did u join the two lines of best fit up? We're they curved and did u cross them at a point

Reply 71

Baby_Mama

Original post by Gingerwave

Phew I think I changed it to that last minute

I thought it was mass number wth

Reply 72

deepakbaji

i thought the catalyst was chromium because chromium is a transition metal that has the properties for a catalyst.

Original post by Baby_Mama

Catalyst was magnesium oxide
one of the answers were Equation 2 because moles were both 0.04
i got mass of oxygen to be 144kg
polysterene cup is used to prevent heat escaping

Reply 73

deepakbaji

Original post by nabihaa

what was the reason for it being an exothermic reaction, I put the energy used to make bonds was greater than the energy released

the amount of energy released when forming bonds was greater than the amount of energy absorbed when making bonds

Reply 74

Gingerwave

Who knows then.. I think it was relative atomic mass because they didn't know how calculate mass number???

Original post by Baby_Mama

I thought it was mass number wth

Reply 75

imdibbyy

it wasnt mgo it was chromium the mass was 940 ish

Original post by Baby_Mama

Catalyst was magnesium oxide
one of the answers were Equation 2 because moles were both 0.04
i got mass of oxygen to be 144kg
polysterene cup is used to prevent heat escaping

Reply 76

chriswillis29

Yep

Original post by Gingerwave

How did u join the two lines of best fit up? We're they curved and did u cross them at a point

Reply 77

Piiii

Original post by Gingerwave

Phew I think I changed it to that last minute

Same, I didn't read the question carefully so I was close on ticking atomic number

Reply 78

imdibbyy

what wud u say grade boundaries would be someone plz make a good estimate

Reply 79

chriswillis29

Ammonia has a lower boiling point because it is a simple covalent structure with weak intermolecular forces which means less energy is needed to break the bonds