# really struggling with exam papers

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#1
Attachment 733162im really struggling with this question, I feel like I understand the concepts in chemistry but then I got a U in my mock paper.

My chem teacher suggested doing more past papers but im struggling, especially with the multiple choice questions, its really affecting my motivation
0
2 years ago
#2
(Original post by Ciara B.)
Attachment 733162im really struggling with this question, I feel like I understand the concepts in chemistry but then I got a U in my mock paper.

My chem teacher suggested doing more past papers but im struggling, especially with the multiple choice questions, its really affecting my motivation
0
#3
(Original post by mafk80)
Sorry not sure why its not showing, its a picture of this question

14) Consider the following data

S(s) + H2(g) = H2S(g) delta H =a
H2(g) + 1/2O2(g) = H20(l) delta H =b
S(s) + O2(g) = SO2(g) delta H =c
H2S (g) + 1 1/2O2 (g) = H2O(l) + SO2 (g) delta H = d

What is the relationship between a, b, c and d

A) a=b+c-d
B) a=d-b-c
C) a=b-c-d
D) a=d+c-b

when i checked the mark scheme it gave A as the correct answer
0
2 years ago
#4
(Original post by Ciara B.)
Sorry not sure why its not showing, its a picture of this question

14) Consider the following data

S(s) + H2(g) = H2S(g) delta H =a
H2(g) + 1/2O2(g) = H20(l) delta H =b
S(s) + O2(g) = SO2(g) delta H =c
H2S (g) + 1 1/2O2 (g) = H2O(l) + SO2 (g) delta H = d

What is the relationship between a, b, c and d

A) a=b+c-d
B) a=d-b-c
C) a=b-c-d
D) a=d+c-b

when i checked the mark scheme it gave A as the correct answer
OK this is what I got.

S + H2 -----> H2S (a)

An arrow point downwards from S should end with the equation S + O2 -----> SO2 (c)
An arrow pointing downwards from H2 should end with the equation H2 + 1/2O2 = H20 (b)
An arrow point downwards from H2S should end with the equation H2S + 1 1/2O2 = H20 + SO2 (d)

Connect the arrows in the Hess´s diagram to get... a + d = b + c
Rearrange to get a = b + c - d
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