IB CLASS
ESTABLISHED ON MARCH 24th, 2020
A B O U T
Hello, we are Junho Paik and JiSeong Park - the founders of 'IB CLASS'. We have created the organization 'IB CLASS' in order to help IB students who are struggling with their subject areas and who desperately need help. Our ultimate goal is to provide students helps for every IBDP subject to help them achieve their goals and to succeed in their academics. We will try our best to provide plenty of information and knowledge to every one of the IB students. Thank you.
Sincerely, Junho Paik & JiSeong Park (Founders of IB CLASS)
Economics
Instagram: ibdp_economics
Email: economicsibdp@gmail.com
Chemistry
Instagram: ibdp_chemistry
Email: indpchemistry@gmail.com
Chemistry Helper
Instagram: ibdp_chemistry_SLandHL
Email: ibdpchemistryslandhl@gmail.com
Physics
Instagram: ibdp_physics
Email: ibhelpers1225@gmail.com
Mathematics
Instagram: ibdp_mathematics
Email: ibdpmathematics@gmail.com
Biology
Instagram: ibo_biology
Email: iboeducare@gmail.com
English
Instagram: ibdp_english
Email: 2020srivenkatavempati@britishschool.g12.br
Theory of Knowledge
Instagram: ibd_tok
Email: ibdptok2020@gmail.com
ECONOMICS
Data Booklet by IB-World-Econ
The IB World Econ Formula Booklet has all equations that need to be memorized for a paper 3 and even for A-Levels and AP! Feel free to download or view the formula booklet (Click View Data Booklet and you will then be redirected to the website)
Cost-Push Inflation (Economy)
I will be teaching you about the inflation caused by a shift in Aggregate Supply Curve.
Cost Push Inflation, as the name suggests, if there is increase in the cost of production of goods and services, there is likely to be a forceful increase in the prices of finished goods and services.
What are the main causes?
1. Higher Price of Commodities
2. Imported Inflation
3. Higher Wages
4. Higher Taxes
5. Higher food price
When this is demonstrated in the diagram, the SRAS, which stands for short run aggregate supply will shift upward from SRAS 1 to SRAS 2 due to an increase in cost of production - total sum of money needed for the production of a particular quantity of output. Thus, the price will increase from PLe to PL2 and the real GDP will decrease from Yef to Y2. However, the new SRAS and Aggregate demand do not intersect on the Long run Aggregate Supply which means that the producers are not producing at the full capacity. Thus, a decrease from Yfe to Y2 will cause unemployment and this , in the long run, could potentially lead to decrease in wages in order for producers to minimize their cost of production. There is no simple solution here and there is not even a good theoretical explanation of how the economy will self correct from the cost push inflation. All we can do is to just wait until the costs of production decrease.
Unemployment
we will be doing Unemployment. Firstly, Unemployment happens when all people of working age that are not working and are actively looking for a job.
How do we calculate this?
Unemployment rate = (Unemployed people) / (labour force) * 100
What is labour force?
It is a term that is used to describe people who can, want to, and is allowed to work. Typically the labour force consists of all people that are currently employed + all unemployed people.
Issues with measuring Unemployment rate
1. The existence of hidden unemployment: people not represented in the unemployment figures:
- people who have given up looking for a job
- people in a parttime job that would want to work full time (which isn’t possible)
- people who are overqualified for a job, but can’t find a better one
2. Unemployment figures are an average: the unemployment figure ignores regional, ethnic, age and gender differences.
Consequences of unemployment
we will be covering the consequences of unemployment. There are basically two types of consequences caused by unemployment.
Economical Consequences
- Loss in GDP (drop in production)
- Loss of tax revenue because unemployed people have less income to pay taxes
- Increased cost of unemployment benefits
- Loss of income for individuals
- Greater differences in income distribution
Personal Consequences
- Increased crime rates (using crimes to increase money to spend)
- Increased stress levels, worries over money
- Increased Indebtedness
- Being unable to pay for housing; homelessness
- Family breakdown
Types of unemployment
We will be learning different types of unemployment in this post
Type: Cyclical (demand deficient)
Cause: Decrease in aggregate demand, causing production to go down and people to become unemployed.
Possible Solution: Demand side policies to increase AD
Type: Structural
Cause: Permanent changes in demand and supply (eg. Changes in taste, advance in technology) causes people in certain industries to become redundant.
Possible solution: - Retraining employees to fit other jobs
- Encourage people to move to other regions
- Reduce unemployment benefits to encourage people to find a new job
Less regulation so employment becomes easier
Type: Seasonal
Cause: Lower labour demand at certain times of year (eg. less labour demand for waitress in winter)
Possible solution:
- Reduce unemployment benefits
- Encourage people to take other jobs in the off-period
Type: Frictional
Cause: Imperfect information between employers and employees: it takes time to find a new job when you left your old job
Possible solution: Improve information flow (eg. Vacancy websites)
- Reduce unemployment benefits
Once again, thank you for all your support and I hope today’s lessons will develop your understanding of the concept of Unemployment. If you have any question, do not hesitate to DM me!! For the next lesson, I will be providing you with some Paper 1 questions related to the concept of Unemployment! Thank you and have a great day
Exchange rates
I will be introducing you guys about the definition of exchange rates and some interesting facts relating to this concept
Exchange rate: The rate at which one country's currency can be exchanged for other currencies in the foreign exchange market.
Foreign exchange market (forex): Where currencies are bought and sold, and exchange rates are determined.
Appreciation:An increase in a currency's value on the forex market.
Depreciation: A decrease in a currency's value.
Q: Who demands supplies a currency on a forex market?
A: - Consumers who wish to buy imports
- Investors who wish to invest in foreign assets
- Governments and central banks
Q: Who supplies a currency on a forex market?
A: - Foreign consumers who buy domestic goods
- Foreign investors who invest in domestic assets
- Foreign governments and central banks
Exchange rate (ER) systems
Floating ER: The value of a currency is determined freely in the forex market by changes in demand and supply
Managed ER: The value of a currency is closely managed by government and central bank policy
Fixed ER: "pegged" system. The value of a currency is fixed against another currency
Paper 1 and 2 questions
Since we have covered unemployment for the last 3 lessons, here is the paper 1 and paper 2 questions for you guys to test your understanding of this topic!
If you would like me to give feedback on your essays, please email me at
ibdpeconomics@gmail.com
Chemistry
Types of Bonding (Chemistry)
In Chapter 4, there are 3 main types of bonding introduced:
- Ionic Bonding
- Covalent Bonding
- Metallic Bonding
1. Ionic Bonding: Electrostatic attraction between two oppositely charged ions.
Characteristics:
- High melting and boiling point
- Only conducts electricity in molten states not in solid states
- Low volatility(tendency of a substance to vaporize) or non-volatile
2. Covalent Bonding: Electrostatic attraction between share pairs of electron and nuclei.
(More specific info coming soon)
3. Metallic Bonding: Electrostatic attraction between cations and delocalized(free) electrons.
Again, if you guys have any questions or specific topic covered, dm me anytime.
Lewis Structure & VSEPR
LEWIS STRUCTURE &VSEPR THEORY
Drawing Lewis Structure:
1. Find the sum of all valence electrons
2. Draw a bond betwen every atom
3. Distribute left electrons to non-centered atoms
4. If there's leftover electrons, goes to center
5. If there's lack of electrons to meet octet, draw double or triple bond. a.) With the exceptions of Be and B, all period 2 elements meet octet rule. From period 3, maximum of 6 electron domain possible.
Regarding the VSEPR Theory, there are questions asking about angles of the shapes.
Linear: 180°
Trigonal Planar: 120°
Tetrahedral: 109.5° or 109° (depends on textbooks) any shapes that are not tetrahedral but with 4 electron domain can be just written as less than 109.5° or 109°
Trigonal bipyramidal: 120° and 90°
Octahedral: 90°
Thermochemistry
This is the brief overview of some important concepts of the chapter. In thermochemistry, it is important to practice with questions as it is more calculation based.
Hybridization HL
Here is Chapter 14.2 Hybridization which is only for HL students. Hybridization: atomic orbitals fuse to create new hybridized orbitals for bonding.
It is important to memorize the definitions of hybridization, formation of sigma and pi bonds as they are frequently asked in IB.As this is challenging topic for many people and important as they show up in exams a lot, it is important to understand the concept properly before moving forward.
Organic Chemistry Presentation by Chemistry Helper!
Each slide will takes 10 seconds
First Lesson is about Organic Chemistry. Key points of this lesson are functional group, homologous series, the nomenclature of Organic Compounds. You guys must memorize class, functional group, name of functional group, suffix in IUPAC name, general formula. Please DM me if you guys have a question related to this topic. The next lesson will be about Structural Isomers, primary, secondary, tertiary compounds, and benzene.
Gas Laws
These are 4 Laws of Gases, which eventually led up to the formation of Ideal Gas Law(PV = nRT). It is really important to know the first 3 laws as they are really important when solving questions. Memorizing these along with diagrams would also help you if you are planning to take SAT 2 Subject Test.
PHYSICS
Kinematics
Kinematics refers to motion of objects without reference to force which causes the motion. In the kinematics topic, we focus on three vector quantities: displacement, velocity, acceleration.
Displacement is the overall change in position of an object. In other words, it shows total distance from start point with direction.
Velocity is the rate of change (increase / decrease) of displacement. In other words, it shows speed and direction of an object.
Acceleration is the rate of change of velocity.
When these vector quantities are plotted on the graphs:
In the Displacement-Time graph, slope represents the velocity at a certain moment.
In the Velocity-Time graph, slope represents Acceleration, and area under the graph represents total displacement.
In the Acceleration-Time graph, the area under the graph represents total change in velocity.
In later lessons, I will solve some practice questions with graphs and hopefully all these contents will make sense more.
Scalar vs Vector Quantity
In IBDP Physics, students are required to know the difference between scalar and vector quantity.
Scalar quantity is a quantity which can be defined by its magnitude only (without vector). This means that scalar quantity does not contain direction.
Vector quantity is a quantity which can be defined by its magnitude and vector, which means that vector quantity contains direction.
For example:
Speed of 16 m/s only shows the magnitude of motion (how fast the object is moving)
Velocity of 16 m/s shows that the object is moving at a speed of 16 m/s in a certain direction
Then how do you know the direction of vector quantity? Most of the time, the question specifies which direction of vector quantity is positive value. Most commonly, direction to the right or up has positive value, and direction to the left or down have negative value.
Kinematics Calculation
In this lesson, I will assume that all students know how to calculate simple calculations of the three vector quantities (e.g. velocity = displacement / time). In IBDP Physics, you must learn 4 equations for kinematics. Also, equation 4 is especially handy when the time period is not given in the question, since it is a time-independent equation. The 4 kinematics equation might not make sense now, but hopefully it will when I show how to use them in practice questions in later lessons. *These equations only apply to objects with constant acceleration.
s = displacement
u = initial velocity
v = final velocity
a = acceleration [Extension]: Applying calculus on Kinematics
IBDP students are not required to know this topic as IBDP physics is a calculus-free course, but learning how calculus is applied to kinematics helps in the course.
When equations of displacement / velocity / acceleration is given, calculus can be used to calculate other vector quantities without using 4 kinematics equations above. As I mentioned in lesson 1, velocity is rate of change of displacement, which means derivative of displacement. The relationship between each vector quantity is shown in the picture above.
Mathematics
BIOLOGY
Quality education in the field of Biology
Mechanism of ATP production
Study smart!
Comparison of Mitosis&Meiosis
Easy way to revise mitosis and meiosis! Any questions/difficulties
Cell Respiration
The four important reactions that take place when a cell respires.
M-Phase
Important pointers to remember while discussing the M-Phase. Most of the action during cell division happens in the M-Phase.
Classification of Polymers
Classification Of Polysaccharides
This lesson gives you all the details of all the different polysaccharides you need to know. Polysaccharides are polymers of carbohydrates made up of hundred of molecules of monosaccharides. Polysaccharides are formed when monosaccharides undergo series of condensation reactions. The properties of polymer depends a lot of the monomer and the type of bonding between them so it becomes very important for you to know the monomers or all the polymers and differences between them. This chart helps you to have everything at once.
Theory of Knowledge
Economics Debate
TBD
TBD
BLACK BOX IN B12
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C O N T A C T
Founders
Chief Executive Officer: Junho Paik
Jiseong Park
Chief Operating Officer: Moohyeon Jung
g e t i n t o u c h w i t h u s
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