CHEMISTRY ASSISTANCE – From “I despise this” to “Hold on that’s genuinely interesting”
1. The Fundamental Essentials – Atoms & The Periodic Table (this is unavoidable)
Matter consists of atoms. Exam-Ready Chemistry Minute spheres containing a nucleus (protons and neutrons) with electrons orbiting in surrounding clouds.
- Protons = positive, define the element (atomic number)
- Neutrons = electrically neutral, influence stability/isotopes
- Electrons = negative, decide bonding and reactivity
The periodic table is not merely ornamental. Moving from left to right means an increase, in protons. Descending a group corresponds to atoms containing additional shells.
Mnemonic technique that rescued me during school:
“Tiny Betty Cannot Purchase Fine Vintage Luminous Grand Aluminum Foolish Trousers Outfits Neatly Arthur Remains Composed.”→ Li Be B C N O F Ne Na Mg Al Si P S Cl Ar K Ca(Indeed I can recall it after 15 years.)
Exam trends you NEED to be aware of:
- Atomic radius: reduces from left, to right expands from top to bottom
- Electronegativity: rises from left to right and from bottom, to top (Fluorine is the avid electron attractor)
- Ionization energy: same pattern as electronegativity
2. Adhesion – How things hold together
Three main types:
- Ionic – combination of metal and non-electron movement → ions pull towards each other (NaCl, MgO)
- Covalent – non-metals sharing electrons
- Non-polar = equal sharing (O₂, N₂)
Polar = unequal sharing (H₂O – oxygen is a bully)Metallic – sea of delocalized electrons (why metals conduct)A brief quiz query you’ll encounter: “Is HF ionic or covalent?” → It’s covalent. Exam-Ready Chemistry Extremely polar since fluorine has an electronegativity of 4.0 and hydrogen has 2.1.
3. Identifying Compounds (the section most people get wrong)
Ionic: cation name + anion name (change to -ideCu²⁺ + SO₄²⁻ → copper(II) sulfate (use numerals, for transition metals)
Covalent: prefixes – mono (rarely used on first), di, tri, tetra, penta…N₂O₅ = dinitrogen pentoxide Acids
Acids:
- Ends in -ide → hydro___ic acid (HCl = hydrochloric)
- Ends in -ate → ___ic acid (H₂SO₄ = sulfuric)
- Ends in -ite → ___ous acid (H₂SO₃ = sulfurous)
4. Stoichiometry – The Calculation That Scares All (but won’t once you’ve seen this)
1 mole = 6.022 × 10²³ particles = molar mass in grams
Guidelines I share with my brother:
- Balance the equation (always #1)
- Convert everything to moles
- Use mole ratio from equation
- Change it back, to the units requested by the question (grams, liters, particles)
A common example that nearly everyone mistakes at once: Exam-Ready Chemistry What quantity of oxygen, in grams is required to combust 16 g of methane (CH₄)?CH₄ + 2O₂ → CO₂ + 2H₂O16 g CH₄ × (1 mol CH₄ / 16 g) × (2 mol O₂ / 1 mol CH₄) × (32 g O₂ / 1 mol) = 64 g O₂
Limiting reactant problems: the substance that gets used up first. Perform two calculations. Select the lesser yield.
5.Gases, Solutions, and Thermochemistry
Ideal gas law: PV = nRT (R = 0.0821 L·atm/mol·K) Molarity = moles solute / liters solution ΔH represents heat under pressure. Exam-Ready Chemistry A negative ΔH indicates an exothermic process (feels warm) whereas a positive ΔH signifies a process.
6. Acids/Bases & Equilibrium
pH = −log[H⁺] Strong acids (HCl, HNO₃, H₂SO₄) fully ionize Weak acids (HF, CH₃COOH) slightly ionize → apply Ka and ICE tables
Le Châtelier’s principle: when a system is disturbed → it adjusts to reduce that disturbance. Adding reactant → moves right Delete product → moves, to the right Increase pressure (gases) → shifts toward fewer moles
7. Quick Study Tips That Actually Work
- Rewrite the periodic table from memory once a week
- Complete 10 stoichiometry exercises practice fosters quickness)
- Describe ideas to your dog, younger sibling or a rubber duck. Exam-Ready Chemistry If you’re unable to explain it you haven’t grasped it fully yet.
PHYSICS HELP – Making Sense of How the Universe Moves
Physics seems intimidating because it combines math with the world. Exam-Ready Chemistry However each subject depends on the one. Learn them sequentially. Everything else will come together.
1. Kinematics – Motion in 1D and 2D
The four equations (assuming constant acceleration):
- v = u + at
- s = ut + ½ at²
- v² = u² + 2as
- s = ½ (u + v)t
Projectile motion: horizontal velocity constant, vertical velocity changes by −9.8 m/s every second.
An instance that appears annually: Exam-Ready Chemistry A ball is launched horizontally from a 30 m cliff with a speed of 20 m/s. What is the distance from the cliffs base, to where it lands?
Duration of fall: apply s = ½ gt² → 30 = ½(9.8)t² → t ≈ 2.47 s Horizontal distance = 20 m/s × 2.47 s ≈ 49.4 m
2. Forces & Newton’s Laws
Fnet = ma stands as the crucial formula, in introductory physics.
Free-body diagrams can be lifesavers. Illustrate all forces: Exam-Ready Chemistry gravity, normal, tension, friction and applied.
Friction: static (≤ μs N) and kinetic (= μk N) μ < 1 almost always (except rubber on rubber can be >1)
Circular motion: Exam-Ready Chemistry centripetal force toward center, Fc = mv²/r (It is NOT a force. It is the force responsible, for the circle: tension, gravity, normal friction)
3. Energy & Momentum
Work = F × d × cosθ (only component parallel to displacement) Power = work/time = F × v
Conservation of mechanical energy only if no non-conservative forces (friction, air resistance).
Momentum p = mv remains conserved in every collision when external forces are absent.
Elastic collision → momentum and kinetic energy are both preserved Inelastic → momentum preserved, KE not (they cling or change shape)
4. Electricity & Magnetism Basics
Coulomb’s law: F = k q1 q2 / r² (k = 9×10⁹) Electric field E = F/q points away from positive
Ohm’s law V = IR Series: Req = R1 + R2 … current same Parallel: 1/Req = 1/R1 + 1/R2 … voltage same
Right-hand rules for magnetic fields (fingers = current, thumb = field for wire; thumb = velocity, fingers = B, palm = force on positive charge)
5. Waves & Light
v = f λ Sound ≈ 343 m/s in air, light = 3×10⁸ m/s Doppler: Exam-Ready Chemistry source moving toward you → higher pitch
Snell’s law: n1 sinθ1 = n2 sinθ2 Complete internal reflection occurs when light travels from a medium with a refractive index to one with a lower refractive index, beyond the critical angle (fiber optics!).
6. Modern Physics Quick Hits
Photoelectric effect → light as particles (photons) E = hf, KE_max = hf – φ De Broglie: everything has wavelength λ = h/p Uncertainty principle: it is impossible to determine both position and momentum at the same time
7. Physics Survival Kit
- Always always always always check units
- draw the diagram before touching equations
- if the answer appears car traveling at 500 m/s) you made a mistake
- solve questions each day for every topic. Physics is a craft, not, about rote learning
ECONOMICS ASSISTANCE – Grasping Money, Decisions and the Reason Prices Occur
Economics is just fancy common sense about scarcity and decisions.
1. Supply and Demand – The Heart of Everything
Demand curve slopes down (higher price → less wanted) Supply curve slopes up (higher price → more profitable to sell)
Equilibrium = the point where they intersect. Exam-Ready Chemistry Price high → excess supply → price drops. Price low → deficit → price increases.
Shifts:Demand moves increased price & quantity (income rises preferences evolve population expands) Supply moves to the right → price decreases quantity increases (technology advances, expenses decrease)
Elasticity formula: %ΔQ / %ΔP
1 elastic, <1 inelastic, =1 unit elastic Gasoline demand is inelastic, in the term but becomes elastic over the long term (as we ultimately purchase hybrids).
2. Consumer and Producer Surplus
Consumer surplus = value to you − price paid Producer surplus = amount received − amount willing to accept Exam-Ready Chemistry At equilibrium total surplus reaches its maximum (deadweight loss occurs when government intervention is ineffective)
3. Market Structures
Perfect competition: many firms, identical product, price takers (wheat farmers) Monopoly: Exam-Ready Chemistry one firm, barriers to entry, price maker (local utility) Monopolistic competition: many firms, differentiated products (restaurants, clothing brands) Oligopoly: few firms, interdependent (airlines, cell carriers)
4. Macroeconomics – The Big Picture
GDP = C + I + G + (X − M) Nominal vs real (adjust for inflation) Unemployment types: frictional, structural, cyclical, natural rate ≈ 4–5%
Inflation as indicated by the CPI. A moderate rate of 2–3% is typically beneficial whereas hyperinflation erodes savings.
Phillips curve: short-run tradeoff inflation vs unemployment (broken in 1970s stagflation)
Fiscal policy = government spending & taxes Monetary policy = The Federal Reserve manages the money supply and interest rates
- Reduced interest rates → increased borrowing → heightened spending → boost
- Raise rates → cool inflation
5. International Trade
Absolute vs advantage (even if you excel in all areas focus on what you’re comparatively better, at and exchange)
Tariffs increase costs, for buyers safeguard employment temporarily and provoke countermeasures eventually.
Strong currency → exports expensive, imports cheap Weak currency → opposite
6. Behavioral Economics (the fun part)
We are predictably irrational. Loss aversion: the pain of losing $100 outweighs the pleasure of gaining $100 Anchoring: Exam-Ready Chemistry the initial number you encounter influences all judgments. Sunk cost fallacy: “Since I’ve already paid $800 for this concert ticket I must attend despite feeling unwell”
7. Econ Study Hacks
- Sketch graphs repeatedly until you can do them without looking
- Explain shifts out loud
- Track news: when the Fed increases rates anticipate the impact, on auto loans and the housing
- Market Engage in the “what’s the opportunity cost?” challenge for every choice, over the course of a week. Exam-Ready Chemistry Truly eye-opening
ACCOUNTING 1 ASSISTANCE – Simplifying the Language of Commerce
Accounting isn’t math. It’s about narrating the journey of money.
1. The Accounting Equation (memorize this in your sleep)
Assets = Liabilities + Equity Alternatively expressed: Exam-Ready Chemistry Equity equals Assets, minus Liabilities (the ownership stake of the owners)
Each individual transaction impacts this formula in two spots. Double-entry accounting.
2.. Credits (the section that causes tears)
Golden rule: Assets & Expenses → increase with debit Liabilities, Equity, Revenue → increase with credit
Memory trick: DEAD → Debits increase Expenses, Assets, Dividends CLIC → Liabilities, Income, Capital are raised by Credits
Example: Buy $5,000 equipment with cash Debit Equipment $5,000 (asset up) Credit Cash $5,000 (asset down)
3. The Four Main Financial Statements
- Income Statement (Profit & Loss) Revenue − Expenses = Net Income
- Statement of Retained Earnings Beginning RE + Net Income − Dividends = Ending RE
- Balance Sheet Assets = Liabilities + Equity at a point in time
- Cash Flow Statement Operating, Investing, Financing activities
4. The Accounting Cycle Step by Step
- Analyze transaction
- Journal entry (chronological)
- Post to ledger (by account)
- Trial balance (debits = credits?)
5.Adjusting entries (accruals, deferrals, depreciation)
6.Adjusted trial balance
7.Financial statements
8.Closing entries (zero out temporary accounts)
9.Post-closing trial balance
5. Common Adjusting Entries
- Accrued revenue: earned but not billed → Debit Receivable, Credit Revenue
- Prepaid expense: payment made in advance but not yet utilized → Debit Prepaid (asset) then recognize expense gradually over time
- Depreciation: Debit Depreciation Expense, Credit Accumulated Depreciation (contra-asset)
Straight-line depreciation = (Cost − Salvage) / Useful life
6. Inventory Methods (exam favorite)
FIFO: first in, first out — ending inventory is newest (most expensive in inflation) LIFO: last entered, first removed. Exam-Ready Chemistry Aligns expenses with income (results in reduced taxes, during inflation yet prohibited by IFRS) Weighted mean: evens everything out
7. Bank Reconciliation
Book balance ± timing differences ± errors = Correct cash balance
8. Real-World Red Flags
- Income recorded prematurely (WorldCom)
- Hiding expenses in “restructuring” (Enron)
- Channel stuffing. Dispatching goods at quarter-end to boost sales figures
9. Accounting Study Tips That Work
- Do 20 journal entries every single day for two weeks — muscle memory
- Make your own cheat sheet of T-accounts and tape it to your wall
- Verbally describe transactions: “Whenever I purchase inventory, on credit inventory increases (debit) accounts increases (credit)”
- Watch “The Accounting Game” (lemonade stand book) — life-changing for beginners
Final Thoughts Across All Four Subjects Exam-Ready Chemistry
Chemistry reveals the composition of substances. Physics describes the way they move and interact. Exam-Ready Chemistry Economics explains why individuals compete for them. Accounting documents track ownership subsequently.
They’re connected. The lithium in your phone battery? Chemistry. The projectile path of SpaceX rockets? Physics. Exam-Ready Chemistry The price of that lithium because of EV demand? Economics. Tesla’s financial statements showing billions in revenue? Accounting.
