MEGIK SCIENCE ACADEMY

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Why is ash lighter than the wood that burned, but rust heavier than the iron? 🤔

A quick SS1 Chemistry thread on the Laws of Chemical Combination

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Preparing students for the task ahead

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How crude oil is found

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Learn to solve simple calculations in chemistry

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So who is a teacher? A teacher is the first builder of every builder in this nation. Over the coming months, let us walk together and discover who these quiet builders really are. But first, is teaching merely a job?

#RespectOurTeachers #HonourOurTeachers #WhoIsATeacher

[MEGIK SCIENCE ACADEMY @AcademyMegik23]

Before the doctor, before the president: who is a teacher?

Before there was a doctor, there was a teacher who taught him the alphabet. Before the engineer designed a bridge, a teacher taught her to count. Before any president took an oath, a teacher taught him to read.

[MEGIK SCIENCE ACADEMY @AcademyMegik23]

Why is ash lighter than the wood that burned, but rust heavier than the iron? 🤔

A quick SS1 Chemistry thread on the Laws of Chemical Combination

[MEGIK SCIENCE ACADEMY @AcademyMegik23]

That is the Laws of Chemical Combination in one thread 🧪

Want the full e-note with diagrams, worked examples and practice questions? Reply "NOTES" or WhatsApp [phone].

Follow @Megik Academy for a new SS1 topic every week

[MEGIK SCIENCE ACADEMY @AcademyMegik23]

Why is ash lighter than the wood that burned, but rust heavier than the iron? 🤔

A quick SS1 Chemistry thread on the Laws of Chemical Combination

[MEGIK SCIENCE ACADEMY @AcademyMegik23]

QUICK TEST 🤔

40 cm³ of hydrogen burn completely in oxygen to form steam. What volume of oxygen is used?

Reply with your answer!

[MEGIK SCIENCE ACADEMY @AcademyMegik23]

EXAM TIPS

Conservation: check if a gas escaped or was gained. Multiple proportions: fix one element, compare the other, divide by the smallest. Volumes: write "at the same temperature and pressure".

[MEGIK SCIENCE ACADEMY @AcademyMegik23]

5. GAY-LUSSAC'S LAW OF COMBINING VOLUMES

Gases react in simple whole-number volume ratios at the same temperature and pressure.

2H₂ + O₂ → 2H₂O means 2 : 1 : 2 by volume.

[MEGIK SCIENCE ACADEMY @AcademyMegik23]

4. RECIPROCAL PROPORTIONS (Richter)

12 g C combine with 32 g O and with 4 g H. O : H = 8 : 1

In water, O : H = 16 : 2 = 8 : 1. The ratios agree

[MEGIK SCIENCE ACADEMY @AcademyMegik23]

3. MULTIPLE PROPORTIONS (Dalton)

For the same 12 g of carbon: CO has 16 g of oxygen CO₂ has 32 g of oxygen

16 : 32 = 1 : 2, a simple whole-number ratio.

[MEGIK SCIENCE ACADEMY @AcademyMegik23]

2. DEFINITE PROPORTIONS (Proust)

A pure compound always has the same composition by mass.

Water from rain, river or borehole: H : O = 1 : 8 every time.

[MEGIK SCIENCE ACADEMY @AcademyMegik23]

CONSERVATION OF MASS (Lavoisier)

Mass of reactants = mass of products. 24 g Mg + 16 g O₂ = 40 g MgO

Ash is lighter because gases escaped. Rust is heavier because iron gained oxygen and water.

[MEGIK SCIENCE ACADEMY @AcademyMegik23]

What is inside an atom?

A quick SS1 Chemistry thread on Atomic Structure 👇

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That is Atomic Structure in one thread ⚛️

Want the full e-note with diagrams and practice questions? Reply "NOTES" or WhatsApp [phone].

Follow @Megik Academy for a new SS1 topic every week

[MEGIK SCIENCE ACADEMY @AcademyMegik23]

What is inside an atom?

A quick SS1 Chemistry thread on Atomic Structure 👇

[MEGIK SCIENCE ACADEMY @AcademyMegik23]

ELECTRON SHELLS

Fill in order: 2, 8, 8, then the next shell. Sodium: 2,8,1 Calcium: 2,8,8,2

QUICK TEST 🤔 Chlorine has atomic number 17 and mass number 35. How many neutrons? Reply below!

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EXAMPLE

Sodium: atomic number 11, mass number 23 Protons 11 Electrons 11 Neutrons 23 − 11 = 12.

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ATOMIC NUMBER AND MASS NUMBER

Atomic number = protons Mass number = protons + neutrons Neutrons = mass number − atomic number.