Rahsia Peperiksaan Kimia SPM

Rahsia Peperiksaan Kimia SPM keluaran SAP menyelitkan contoh kesalahan jawapan umum pelajar semasa menjawab soalan kimia berbentuk SPM secara topikal. Calon SPM berpeluang meneroka tips menjawab Kimia SPM untuk menskor A+ dalam SPM dari penulis buku yang berpengalaman. Guru-guru yang berminat boleh menghubungi SAP atau meninggalkan komen.  

Number of Atoms & Number of Molecules

Which of the following substance contains 1.204 x 10²⁴ atoms?

A  1 mol of nitrogen gas
B  1 mol of ammonia
C  1 mol of water
D  1 mol of argon

Many of my students choose the wrong answer in the current topical test.

1 mol of nitrogen gas consists of 1 x 6.02 x 10²³ molecules. 

Number of atoms in 1 mol of nitrogen gas is 2 x 6.02 x 10²³ .
(Each nitrogen, N₂ molecule consists of 2 nitrogen atoms)

1 mol of ammonia consists of 1 x 6.02 x 10²³ molecules

Number of atoms in 1 mol of ammonia gas is 4 x 6.02 x 10^23.
(Each ammonia, NH₃ molecule consists of 4  atoms) 

1 mol of water consists of 1 x 6.02 x 10²³ molecules

Number of atoms in 1 mol of water is 3 x 6.02 x 10²³
(Each water, H2O molecule consists of 3 atoms) 

1 mol of argon consistss of 1 x 6.02 x 10²³ atoms. 


The correct answer : A

Interpreting Graph relating to Rate of Reaction

Hydrogen peroxide decomposes to water and oxygen.



In this reaction, rate of reaction is measured by the changes in volume of oxygen gas released per unit time.

Rate of reaction can be shown by a steeper curve.

Curve Q has  a steeper curve.  The rate of reaction is higher.   The possible factors affecting the rate of reaction is : size, concentration, temperature, pressure and catalyst.  The possible factor mostly is concentration.  Higher concentration, higher rate of reaction.  

Curve Q shows that volume of gas released is lesser. 

Volume of oxygen gas released depends at the quantity of reactant(in more specific, number of moles of hydrogen peroxide used).   

Number of moles of hydrogen peroxide used in the initial experiment is 

(0.1 x 25)/1000 = 0.0025 

After determining number of moles of hydrogen peroxide given in A, B, C & D. 

Only the number of moles of hydrogen peroxide in C is the smaller than 0.0025.

The correct answer : C

Determining Rate of Reaction

In the reaction between limestone powder(calcium carbonate) hydrochloric acid, 17 cm³ of carbon dioxide that produced is in 3.5 minutes. 

Average rate of reaction is 17 cm³/3.5 min

But, during the second minute, only (12.5 - 7.5) cm³ of carbon dioxide gas released in 1 minute time, 

Average rate of reaction during the second minute is

(12.5 - 7.5) cm³ / (2 - 1) min 

The correct answer is : C

Modul Perfect Score SBP (Kimia) 2012

Perfect Score SBP 2012 is prepared by a group of experienced teacher.   It consists :

1. Answering techniques for Paper 2 & 3 SPM
2. 5 sets of questions which arranged according to topics. 

I believe it help students to get a thorough revision through the exercises. You may download through the link provide. 

Download

Any questions that need clarification from Chem2u, please post by using the link at the comments below this post. A text box will appear.  Remember to include your name before you click the button Publish. 

Paper 2 Trial Chemistry SPM Terengganu 2012

All 5B, 5F & 5G Students

 Please attempt the following questions in Paper 2 Trial Chemistry SPM Terengganu 2012.

Question 7 : Salts

Question 8 : Redox Reactions

Question 9 : Carbon Compounds

Question 10 : Rate of Reaction

All of you are welcomed to post your answer or ask questions here. 
Remember : Please click at the comments below this post. A text box will appear.  Remember to include your name before you click the button Publish.  A best response & active participant will be acknowledged by Chem2u after the discussion is closed on 29 October 2012. 

Chem Quest 2011

Mr Adura has compiled a set of multiple choice questions from SPM and trial papers from 2003 - 2009 according to chapter. It's helpful for every students to attempt this question after a chapter is taught in the class. Students will have better understanding to apply their chemistry concepts in different situation. To download the question,

Form 4	Form 5
Chapter 2	Chapter 1
Chapter 3	Chapter 2
Chapter 4	Chapter 3
Chapter 5	Chapter 4
Chapter 6	Chapter 5
Chapter 7
Chapter 8
Chapter 9 Thanks Mr Adura from ASIS.

Perfect Score Chemistry Module Year 2010

Perfect Score Chemistry Year 2010 compiles common questions for Paper 2 & 3 SPM into 4 set. 

Set 1: Chapter 2, 3, 4, & 5 in Form 4
Set 2: Chapter 6 in Form 4 & Chapter 3 in Form 5
Set 3: Chapter 7 & 8 in Form 4; Chapter 1 & 4 in Form 5
Set 4 : Chapter 2 & 5 in Form 5, Chapter 9 in Form 4

To download,

• Question
• Answer Scheme

This set is helpful especially to know better common questions in Paper 2 & 3 SPM.