How to pass the IB chemistry exam
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Techniques and tips on how to answer IB chemistry questions, so that you pass the IB chemistry exam with a high grade
Missão: To help students pass the IB chemistry exam and get to the University of their choice
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Equilibrium is necessary for the May exams | How to pass the IB chemistry exam
I am going to stick my neck out here and say there will be a question on equilibium in the May exams for the IB, both SL and HL. It is not as certain as one on quantitative chemistry, but equilibrium is such an important topic, and, more importantly, examiners love the variety that is possible in questions in this topic. [ 629 more words ]
https://www.solutionsinchemistry.com/equilibrium-is-necessary-for-the-may-exams/
solutionsinchemistry.com I am going to stick my neck out here and say there will be a question on equilibium in the May exams for the IB, both SL and HL. It is not as certain as one on quantitative chemistry, but equilibrium is such an important topic, and, more importantly, examiners love the variety that is possible in qu...
Do you know the definitions | How to pass the IB chemistry exam
Exam questions that require you to write a definition may only be worth one mark, but there may be three or four of them spread around the three papers. In addition another question may assume you understand a concept, and that question may be worth three or four marks. For example this is a common question about acids: a. Define the terms strong acid and weak acid. [ 197 more words ]
https://www.solutionsinchemistry.com/do-you-know-the-definitions-2/
solutionsinchemistry.com Exam questions that require you to write a definition may only be worth one mark, but there may be three or four of them spread around the three papers. In addition another question may assume you understand a concept, and that question may be worth three or four marks.For example this is a common q...
The four things you must know when using PV=nRT | How to pass the IB chemistry exam
The four thigs you must remember when using PV=nRT
This is a simple equation, and yet many students get the wrong answer mainly because they are unclear about the units used. If you are using the data booklet value for R of 8.31 J K−1 mol−1 then you must use the correct units for the other quantities: P Pascals, and atmospheric pressure is approximately 100,000 Pa. V cubic metres, m3… [ 105 more words ]
https://www.solutionsinchemistry.com/the-four-things-you-must-know-when-using-pvnrt/
solutionsinchemistry.com This is a simple equation, and yet many students get the wrong answer mainly because they are unclear about the units used. If you are using the data booklet value for R of 8.31 J K−1 mol−1 then you must use the correct units for the other quantities: P Pascals, and atmospheric pressure is appro...
Why are some reactions exothermic and others endothermic? | How to pass the IB chemistry exam
Exothermic and endothermic are related to breaking and forming bonds. Breaking bonds requires energy and are therefore endothermic. Forming bonds gives out energy and are therefore exothermic. Most students understand that. Where the problem comes for some students is the belief that a reaction such as this is endothermic because bonds are breaking CaCO3 => CaO + CO2 It is endothermic, but NOT because bonds are breaking. [ 131 more words ]
https://www.solutionsinchemistry.com/why-are-some-reactions-endothermic-and-others-exothermic/
solutionsinchemistry.com Tips and techniques to help you answer IB chemistry questions fast and accurately
Problem in Stoichiometry | How to pass the IB chemistry exam
Problem in Stoichiometry
https://www.solutionsinchemistry.com/problem-in-stoichiometry-2/
solutionsinchemistry.com Last week I gave the following question: A student recently asked me to help her with this problem: (i) Is it possible for the following reaction to exist and give reasons for your answer? A(g) + B(g) C(g) 1dm3 1dm3 1dm3 All gases are measured at the same temperature and pressure. (ii) Can you sugge...
Problem in stoichiometry | How to pass the IB chemistry exam
A student recently asked me to help her with this problem: (i) Is it possible for the following reaction to exist and give reasons for your answer? A(g) + B(g) C(g) 1dm3 1dm3 1dm3 All gases are measured at the same temperature and pressure. (ii) Can you suggest one reaction for which this is true? I was a little surprised that she found this question difficult, as this student was in the second year of the IB HL and had completed the IGCSE before that. [ 98 more words ]
https://www.solutionsinchemistry.com/problem-in-stoichiometry/
solutionsinchemistry.com A student recently asked me to help her with this problem: (i) Is it possible for the following reaction to exist and give reasons for your answer? A(g) + B(g) C(g) 1dm3 1dm3 1dm3 All gases are measured at the same temperature and pressure. (ii) Can you suggest one reaction for which this is true? I...
More stoichiometry
There are some questions which can confuse students mainly because of the use of language. Atoms, molecules, ions, and moles are important words. Make sure you know the differences now, because in the stress of an exam their difference will become too vague, and you can lose valuable marks through carelessness. In general the number of atoms or molecules or ions in 1.0 mole, or even a smaller amount is a large number, based on Avogadro’s number 6.02 x 1023 and is usually something of the order of 1021, 1022, 1023, or 1024. [ 211 more words ]
http://www.solutionsinchemistry.com/more-stoichiometry/
solutionsinchemistry.com There are some questions which can confuse students mainly because of the use of language. Atoms, molecules, ions, and moles are important words. Make sure you know the differences now, because in the stress of an exam their difference will become too vague, and you can lose valuable marks through c...
Stoichiometry and variations
What do you see when you are given this equation in a question on titration? NaOH (aq) + HCl (aq) => NaCl (aq) + H2O (l) You could take the atomic masses from the periodic table and put these masses under each formula: NaOH (aq) + HCl (aq) => NaCl (aq) + H2O (l) 40.00g 36.46g 58.44g 18.02g Alternatively you could put the number of moles under each formula: [ 256 more words ]
http://www.solutionsinchemistry.com/stoichiometry-and-variations/
solutionsinchemistry.com What do you see when you are given this equation in a question on titration? NaOH (aq) + HCl (aq) => NaCl (aq) + H2O (l) You could take the atomic masses from the periodic table and put these masses under each formula: NaOH (aq) + HCl (aq) => NaCl (aq) + H2O (l) 40.00g 36.46g 58.44g 18.02g Alternati...
Stoichiometry and chemistry: The seven ideas you must know
Stoichiometry and chemistry
http://www.solutionsinchemistry.com/stoichiometry-and-chemistry-the-seven-ideas-you-must-know/
solutionsinchemistry.com Tips and techniques to do stoichiometry questions so you pass the IB chemistry exam
The two equations you must know for quantitative chemistry
In order to do titration calculations the following two mathematical equations are usually needed: c =n/V 2. n=m/Mr There are some titrations you are expected have done in labs eg sodium hydroxide and hydrochloric acid. However you are also expected to be able to do the calculations for a titration when you are given chemical equations that you have never seen before. [ 488 more words ]
http://www.solutionsinchemistry.com/the-two-equations-you-must-know-for-quantitative-chemistry/
solutionsinchemistry.com In order to do titration calculations the following two mathematical equations are usually needed: c =n/V 2. n=m/Mr There are some titrations you are expected have done in labs eg sodium hydroxide and hydrochloric acid. However you are also expected to be able to do the...
Are you doing HL chemistry in the IB?
Make sure you understand logarithms and exponentials. You will need them in order to do the topics acid and bases and activation energy. Check out your knowledge on my page Mathematical skills.
http://www.solutionsinchemistry.com/are-you-doing-hl-chemistry-in-the-ib-2/
solutionsinchemistry.com Tips and techniques to help you pass the IB chemistry exam
What you must remember when using the ideal gas equation, PV=nRT
This is a simple equation, and yet many students get the wrong answer mainly because they are unclear about the units used. If you are using the data booklet value for R of 8.31 J K−1 mol−1 then you must use the correct units for the other quantities: P Pascals, and atmospheric pressure is approximately 100,000 Pa. V cubic metres, m3… [ 103 more words ]
http://www.solutionsinchemistry.com/what-you-must-remember-when-using-the-ideal-gas-equation-pvnrt/
solutionsinchemistry.com Units for calculations involving the ideal gas law PV=nRT
How to work out oxidation numbers
Oxidation number is a concept that some students find difficulty with. It may be worth only 1 mark in paper 1, yet in paper 2 it can be worth as much as 6 marks. It has been appearing more often in exams since 2009. Practice with examples is the sure way to succeed. Rules for calculating oxidation number All elements… [ 539 more words ]
http://www.solutionsinchemistry.com/how-to-work-out-oxidation-numbers/
solutionsinchemistry.com Oxidation number is a concept that some students find difficulty with. It may be worth only 1 mark in paper 1, yet in paper 2 it can be worth as much as 6 marks. It has been appearing more often in exams since 2009. Practice with examples is the sure way to succeed. Rules for calculating oxidation…
Why do we use moles?
IB chemistry questions are set at different levels of understanding. Look at these questions and do them without a calculator before reading further : What is the molar mass of carbon dioxide? How many oxygen atoms are there in two moles of carbon dioxide? The heat energy for power stations comes from a variety of sources. Some of these are non-renewable, such as oil, coal, natural gas, and nuclear fuels. [ 674 more words ]
http://www.solutionsinchemistry.com/why-do-we-use-moles/
solutionsinchemistry.com IB chemistry questions are at different levels of understanding. Look at these questions and do them without a calculator before reading further : What is the molar mass of carbon dioxide? How many oxygen atoms are there in two moles of carbon dioxide? The heat energy for power stations comes from…
Do you want to remember more after a class?
The more you can remember the better your results in the exams. People are different but most people can’t remember more than about 20% of the material that was taught in a classroom. And a week later you will be lucky to remember 5%. The amount you remember depends on: your interest in the topic, the way the teachers runs the class and his/her attitude towards the students… [ 346 more words ]
http://www.solutionsinchemistry.com/do-you-want-to-remember-more-after-a-class/
solutionsinchemistry.com Tips and techniques to help you pass IB chemistry exams
Do you know what carries the charge in voltaic cells?
This is a question in paper 1 that can be done in less than 30 seconds. Which particles carry charges in the components of a voltaic cell? wire salt bridge electrolyte A electrons ions electrons B ions electrons ions C ions electrons electrons D electrons ions ions See if you can do this in less than 30 seconds, so that you can save time in order to do other questions. [ 263 more words ]
http://www.solutionsinchemistry.com/do-you-know-what-carries-the-charge-in-voltaic-cells/
solutionsinchemistry.com Tips and techniques to answer IB chemistry questions, so you pass the IB chemistry exam.
How to balance a combustion reaction
Balancing combustion equations is simple and quick when you know the technique. Consider this question: Write the balanced equation for the complete combustion of propane C3H8. When applied to a hydrocarbon the phrase “complete combustion” means the only products are carbon dioxide and water. So we start with C3H8 + O2 ==> CO2 + H2O Next we start from the carbon and realise that if there are 3 carbon atoms in the molecule of propane there must be 3 molecules of CO2. [ 302 more words ]
http://www.solutionsinchemistry.com/how-to-balance-a-combustion-reaction/
solutionsinchemistry.com Tips and techniques to answer IB chemistry questions so you pass the IB exam
How to deal with gas stoichiometry in IB chemistry | How to pass the IB chemistry exam
How to answer questions on gas stoichiometry. Go to
http://www.solutionsinchemistry.com/how-to-answer-questions-on-gas-stoichiometry/
solutionsinchemistry.com Tips and techniques for solving IB chemistry questions and passing the IB exam
How to answer IB chemistry questions fast and accurately
I have devoted many blog posts to helping students answer IB chemistry questions fast and accurately. Here are a few: If you prefer videos you can get some of my youtube ones here:
http://www.solutionsinchemistry.com/how-to-answer-ib-chemistry-questions-fast-and-accurately/
How to do Paper 1 questions in less than 30 seconds
Some Paper 1 questions in SL and HL can be done in less than 30 seconds. In my youtube videos I show you how. Go here for one video on mols and concentrations, usually the first or second question in the exam paper.
http://www.solutionsinchemistry.com/how-to-do-paper-1-questions-in-less-than-30-seconds/
solutionsinchemistry.com Tips and techniques to answer IB chemistry questions fast and accurately
Do you know the two equations to use with titration calculations?
In order to do titration calculations the following two mathematical equations are usually needed: c =n/V 2. n=m/Mr There are some titrations you are expected have done in labs eg sodium hydroxide and hydrochloric acid. However you are also expected to be able to do the calculations for a titration when you are given chemical equations that you have never seen before. [ 492 more words ]
http://www.solutionsinchemistry.com/do-you-know-the-two-equations-to-use-with-titration-calculations/
solutionsinchemistry.com Tips and techniques to help you solve IB chemistry questions and do titration calculations.
Do you understand stoichiometry?
What do you see when you are given this equation in a question on titration? NaOH (aq) + HCl (aq) => NaCl (aq) + H2O (l) You could take the atomic masses from the periodic table and put these masses under each formula: NaOH (aq) + HCl (aq) => NaCl (aq) + H2O (l) 40.00g 36.46g 58.44g 18.02g Alternatively you could put the number of moles under each formula: [ 515 more words ]
http://www.solutionsinchemistry.com/do-you-understand-stoichiometry-2/
solutionsinchemistry.com What do you see when you are given this equation in a question on titration? NaOH (aq) + HCl (aq) => NaCl (aq) + H2O (l) You could take the atomic masses from the periodic tabl…
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Can you manipulate equations?
The following three questions are not about chemistry, they are more about your ability to manipulate mathematical equations and some general scientific knowledge. Try them and time how long it takes you before you read my answers. If you need more than three minutes then you need to practice with the equations involved. Container A contains gas X, and container B contains gas Y. [ 419 more words ]
http://www.solutionsinchemistry.com/can-you-manipulate-equations/
solutionsinchemistry.com Tips and techniques to help you answer IB chemistry questions
Do you know what is in your Data Booklet
IB chemistry students are given a Data Booklet in the exam. Make friends with your data booklet so that you know your way around it BEFORE you enter the exam room. Sometimes the exam questions say which page to find information needed for a question, but sometimes they don’t. They may only say the data is in the Data Booklet and you are expected to find it without any further help. [ 135 more words ]
http://www.solutionsinchemistry.com/do-you-know-what-is-in-your-data-booklet/
solutionsinchemistry.com Tips and techniques to help you pass IB chemistry
Do you understand moles?
With paper 1 questions you must quickly see and act on the fundamental issue. Try these three questions. Time yourself. If you can do all three in less than two minutes total then you understand the issues involved, and if you require more than four minutes then study hard. In an exam you are given 1.5 minutes per question, however these are the easy ones, and you have to save time for the more difficult later ones. [ 358 more words ]
http://www.solutionsinchemistry.com/do-you-understand-moles/
solutionsinchemistry.com Tips and techniques to answer IB chemistry stoichiometry questions in Paper 1
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