Quiz Using Moles - Complete Theory & Formulas Cambridge IGCSE Chemistry - Grade 9 1. The Mole Concept - Core Theory Definition of a Mole A mole is the amount of substance that contains as many elementary entities (atoms, molecules, ions) as there are atoms in exactly 12 grams of carbon-12 . Avogadro's Constant N A = 6.022 × 10 23 mol -1 This means 1 mole of any substance contains 6.022 × 10 23 particles Key Principle: One mole of any substance contains the same number of particles, but the mass depends on the type of particle. 2. Fundamental Formulas 2.1 Mole-Mass Relationship Number of moles (n) = Mass (m) ÷ Molar mass (M) n = m/M Mass (g) ...

Number Pattern Quiz Number Pattern Question: 1 /20 Score: 0 Submit Answer FINISH! Total Score: 0 /100 Start New Quiz Number Pattern Theory & Formulas 1. Arithmetic Sequences Definition A sequence where each term increases or decreases by a constant difference . an = a₁ + (n-1)d Where: an = nth term a₁ = first term d = common difference n = position of term ...

📊 Addition and Subtraction within 10,000 Question 1 of 20 Score: 0 / 100 Loading question... Submit Answer Next Question 🎉 FINISH! 🎉 Your Score: 0 / 100 🔄 Start New Quiz additional question Addition and Subtraction within 10,000 Addition and Subtraction within 10,000 In these notes, we will explore how to add and subtract numbers up to 10,000. This includes simple operations without regrouping, operations requiring regrouping, mental strategies, and solving word problems using these skills. 1. Simple Addition within 10,000 Simple addition involves adding numbers where the sum of digits in each place value (ones, tens, hundreds, thousands) is less than 10, so no regr...

Rounding Estimation Question 1 Submit Score: 0 Reset Estimation: Your Math Superpower What Is Estimation? Estimation is finding a value close enough to the exact answer—essentially a smart guess. Key Methods Covered Rounding Numbers Front-End Estimation Real-life applications Rounding Rules Nearest Ten Look at the ones digit : 0-4 → Round DOWN 5-9 → Round UP Replace the ones digit with 0 . Example: 42 → 40 . Nearest Hundred Look at the tens digit : 0-4 → Round DOWN 5-9 → Round UP Change tens and ones to 0 . Example: 2596 → 2600 . Nearest Thousand Look at the hundreds digit : 0-4 → Round DOWN 5-9 → Round UP Change hundreds, tens, and ones to 0 . Example: 7503 → 8000 . Quick Reference Chart Number Nearest Ten Nearest Hundred Nearest Thousand ...

Quiz 1:   Fullscreen Mode Quiz 2:   Fullscreen Mode Fenomena Sederhana Magnetisme 15.1 Magnet dan Sifat-sifatnya Definisi Magnet Magnet adalah benda yang dapat menghasilkan gaya magnet sehingga mampu menarik atau menolak benda lain tanpa bersentuhan. Sifat Utama Magnet Menarik bahan magnetik (besi, baja, nikel, kobalt). Mempunyai dua kutub: Kutub Utara (N) dan Kutub Selatan (S) . Kekuatan terbesar ada di kutub-kutubnya. Jika digantung bebas, selalu sejajar utara–selatan bumi . Like poles repel (N–N atau S–S tolak-menolak) dan unlike poles attract (N–S tarik-menarik). Bahan Magnetik vs Non-magnetik Bahan Magnetik Bahan Non-magnetik Besi, Baja, Nikel, Kobalt Aluminium, Tembaga, Plastik, Kayu Induksi Magnet Bahan magnetik dapat menjadi magnet sementara ketika berada di dekat magnet. Proses ini disebut induksi ; kutub yang terbentuk selalu berlawanan dengan kutub mag...