✧science stream students˚₊‧₊

😍😍😍

9hb eh?

hai hai🧐👀

Soalan Add Maths untuk hari ni! Saja nak tengok korang masih ingat tak konsep Circular Measure ni. Siapa dapat answer bole post kat bawah oke

hello everyone,ini soalan untuk chapter 1 Form 5 Circular Measure.

Isotope usage ​1. Cobalt-60 (Cancer Treatment) ​The Trick: Remember the "C". ​Cobalt = Cancer. ​It is used in radiotherapy to kill cancer cells using gamma rays. ​2. Iodine-131 (Thyroid / Goitre) ​The Trick: Think of Salt. ​In Malaysia, we have "Iodized Salt" to prevent Goitre (swelling of the neck). ​Iodine = Illness in the neck (Thyroid). ​3. Carbon-14 (Archaeology) ​The Trick: Think of "Old". ​All living things are made of Carbon. When they die, the Carbon-14 decays. ​Carbon = Chronology (Estimating the age of fossils/artifacts). ​4. Phosphorus-32 (Agriculture) ​The Trick: Think of Plants. ​Phosphorus = Plants. ​Used as a tracer to see how much fertilizer a plant absorbs. ​5. Uranium-235 (Energy) ​The Trick: Think of "U" for Utility. ​Uranium = Utility (Generating electricity in nuclear power plants). ​6. Sodium-24 (Engineering) ​The Trick: Think of "S" for Seepage. ​Sodium = Seepage. ​Used to detect leaks (seepage) in underground pipes.

​3. Subatomic Particles & Isotopes ​Proton Number: Number of protons in the nucleus. ​Nucleon Number: Total number of (Protons + Neutrons). ​Trick: Nucleon = Number of Neutrons + Protons. ​Isotopes: Atoms of the same element with the same proton number but different nucleon numbers (or different number of neutrons).

2. History of Atomic Models (Acronym: DAL-THOM-RU-BO-CHAD) ​Use this to remember the scientists in the correct order: ​DAL (Dalton) – Solid sphere (The "indivisible" atom). ​THOM (Thomson) – Discovered Electrons (Plum Pudding Model). ​RU (Rutherford) – Discovered Proton & the Nucleus. ​BO (Bohr) – Electrons move in Shells (Orbits). ​CHAD (Chadwick) – Discovered Neutron (The final piece).

1. Changes in State of Matter (Heating/Cooling Curves) ​This is a "hot" topic for Paper 2 (Structured Questions). ​The "Flat Line" Trick: Whenever the graph goes horizontal (plateau), the Temperature is Constant. ​Heating: Why? Heat energy is used to overcome the forces of attraction between particles (so temperature doesn't rise). ​Cooling: Why? Heat energy released is balanced by the heat lost to the surroundings.

CHEMISTRY C3 F4🫟