# RL  

> Living how I like, Building what I Want, Teaching what I know.


## Pages

- [Tests for gases](https://rlwong.com/tests-for-gases/): Here are the tests for the different gases, and the positive test results: Gas Positive Test Results ammonia, NH₃ turns damp red litmus paper blue carbon dioxide, CO₂ turns limewater milky chlorine, Cl₂ bleaches damp litmus paper hydrogen, H₂ ‘pops’ with a lighted splint oxygen, O₂ relights a glowing splint sulfur dioxide, SO₂ turns acidified aqueous potassium manganate(VII) from purple to colourless Tests for Gases Watch this video here for the tests for the above gases:
- [Tests to identify anions](https://rlwong.com/tests-to-identify-anions/): Here are the tests used to identify anions. anion test Positive test results carbonate, CO₃²⁻ Add dilute acid, then test for carbon dioxide gas. Effervescence of carbon dioxide gas is produced. chloride, Cl⁻(must be in solution) Acidify with dilute nitric acid, then add aqueous silver nitrate. White ppt. bromide, Br⁻(must be in solution) Acidify with dilute nitric acid, then add aqueous silver nitrate. Cream ppt. Iodide, I⁻(must be in solution) Acidify with dilute nitric acid, then add aqueous silver nitrate. Yellow ppt. nitrate, NO₃⁻(must be in solution) Add aqueous sodium hydroxide, then aluminium foil, then warm carefully. Ammonia gas is […]
- [Testing for Cations with Aqueous Sodium Hydroxide and Aqueous Ammonia](https://rlwong.com/testing-for-cations-with-aqueous-sodium-hydroxide-and-aqueous-ammonia/): Testing of aqueous cations with aqueous sodium hydroxide and aqueous ammonia: Cation When aqueous sodium hydroxide is added When aqueous ammonia is added aluminium, Al³⁺ White ppt formed, soluble in excess aqueous sodium hydroxide, to give a colourless solution. White ppt formed, insoluble in excess aqueous ammonia. ammonium, NH₄⁺ Ammonia gas is liberated when a solution containing ammonium (NH₄⁺) is heated with aqueous sodium hydroxide. – calcium, Ca²⁺ White ppt formed, insoluble in excess aqueous sodium hydroxide. No ppt or slight white ppt observed. chromium (III), Cr³⁺ Green ppt formed, soluble in excess aqueous sodium hydroxide, to give a green […]
- [Flame Test](https://rlwong.com/flame-test/): A flame test can be used to identify the cation present in an ionic compound. To conduct a flame test: Watch the video below for the steps involved in flame test. Colour of Flame for Flame Test Ion Present Colour of Flame (in flame test) lithium, Li⁺ Red sodium, Na⁺ Yellow potassium, K⁺ Lilac calcium, Ca²⁺ Orange-red barium, Ba²⁺ Light Green copper (II) , Cu²⁺ Blue – Green Watch this video where they show the flame test conducts for ionic compounds containing ions such as lithium, sodium, potassium, calcium, barium and copper (II):
- [Blog](https://rlwong.com/latest/)
- [Updates](https://rlwong.com/updates/)
- [ABRSM Grade 1 Piano Scales](https://rlwong.com/abrsm-grade-1-piano-scales/): Here are the scales you are tested on for those taking the practical exam. Scales in Similar Motion Hands Together (1 Octave) Recommended Speed: ♩ = 60 [where each note is played as a ♪] Scales in Similar Motion Hands Separately (2 Octaves) Recommended Speed: ♩ = 60 [where each note is played as a ♪] Contrary Motion (1 Octave) Recommended Speed: ♩ = 60 [where each note is played as a ♪] C Major Arpeggios, Hands Separately (1 Octave) Recommended Speed: ♩ = 58 [where each note is played as a ♪]
- [Grade 1 ABRSM Music Theory](https://rlwong.com/grade-1-abrsm-music-theory/): ABRSM Grade 1 Music Theory – The Complete Course Get this course here. This is the best course you can get (imo) to get started with learning music theory or to get your child started learning music theory. I go through each concept tested in the ABRSM Grade 1 online music theory exam, and tell you how to solve them. Grab this course here. ABRSM Grade 1 Music Theory – Practice Papers Get more practice for the ABRSM Grade 1 Online Music Theory test here. The exam is an online one, but there is just 1 mock paper available by […]
- [Quiz: Equation of straight lines](https://rlwong.com/quiz-equation-of-straight-lines/): Loading…
- [A Level Math Paper 1 Course (Cambridge International)](https://rlwong.com/a-level-math-paper-1-course-caie/): A Level Math Paper 1 Course: Get it here Below, you’ll find links to the external resources that I have created for the above course. Section 1 Section 2: Quadratic Section 3: Coordinate Geometry Section 4: Functions Section 5: Circular Measure Section 6: Series Section 7: Trigonometry Section 8: Differentiation Section 9: Integration Bonus Section
- [Books](https://rlwong.com/books/): I have authored a number of books. You can find them on amazon. Below are the list of books I have wrote and published. Mathematics Mathematics
- [RL's Udemy Courses](https://rlwong.com/udemy/): Hello, and welcome to the full list of my Udemy Courses. Here, you’ll find all my courses listed in the Udemy Platform. Topics: Property Risk Engineering | Mathematics | Chemistry | Technology | Piano | Music Theory | Ear Training (Music)| Property Risk Engineering Introduction to Dust Explosion: This is a topic that I’m seriously interested in when I was a property risk engineer, doing risk surveys. The implications are great, and this hazard is present in many places. This introduction is written to help anyone who wants to understand the risk dust poses, and identify them at their companies […]
- [RL's Portfolio](https://rlwong.com/): Living How I Love, Building What I Imagine, Teaching What I Know By RL Hello! I’m RL. I live the life I love building things that I imagine, and teaching what I know. You can see my portfolio below. 😊 ACube Piano Studio I love playing the piano and would love to share this joy with you! Are you interested to teach yourself how to play the piano, read sheet music, and master this wonderful instrument on your own terms? Then this is the site to visit. ACube Piano Studio is a membership site designed specifically for anyone who wish […]
- [ABRSM Music Theory Terms and Signs Flashcards (Grades 1 - 5)](https://rlwong.com/abrsm-music-theory-terms-and-signs-flashcards-grades-1-5/): Here are the flash cards for Grades 1 – 5, music theory exam. Flashcards for ABRSM Grade 1 Terms and Signs In the Grade 1 ABRSM Online music theory exam, students are tested on 24 Italian terms and 10 signs. Grade 1 Terms: Grade 1 Signs Flashcards for ABRSM Grade 2 Terms and Signs In the Grade 2 ABRSM Online music theory exam, students are tested on 24 new Italian terms and 9 new signs. Note that terms and signs from preceding grades (i.e. grade 1) may also be tested. Grade 2 Terms Grade 2 Signs Flashcards for ABRSM Grade […]
- [Udemy Courses](https://rlwong.com/udemy-courses/): To date, I have created 5 courses on Udemy. Here’s the list of the courses I have created. I have organized them by categories. Engineering Technology Personal Development Music Academics Udemy Courses on Engineering A brief introduction to dust explosions Udemy Courses on Technology Udemy Courses on Personal Development Udemy Courses on Music ABRSM Online Music Theory Grade 1 – Complete Course ABRSM Online Music Theory Grade 2- Complete Course ABRSM Online Music Theory Grade 5 – Complete Course ABRSM Grade 5 Music Theory Practice Tests Udemy Courses on Academics
- [Terms of Use](https://rlwong.com/terms-of-use/): All our products sold on gumroad at https://therlwong.gumroad.com are the property of rlwong.com. Without our consent, you are not allowed to reproduce, sell, copy them. All our products are only intended for the individual who purchases it. You are not allowed to share, reproduce, resell or use it in any other way. We sell our online courses and digital products using the Gumroad platform. These are highly reputable platforms that have existed for many years, and we use them as we believe they would provide you with a seamless experience. However, we have no control over these platforms (e.g. uptime, […]
- [Contact](https://rlwong.com/contact/): You can reach us via the form below: Loading…
- [Disclaimer Policy](https://rlwong.com/disclaimer-policy/): Our website address is: https://rlwong.com. This disclaimer policy applies to the use of our Website (rlwong.com and all its subdomains/ pages/ posts and so on),  newsletter subscribers, products, and any other services we may offer: While efforts have been made to ensure that the information we provide (including our paid products) is accurate, we will not be held liable for any inaccuracies. We believe that results and successes are the results of hard work, perseverance, and many other factors. As such, we do not guarantee results or success. We aim to deliver our best, but we understand the many factors […]
- [What I am Learning](https://rlwong.com/what-i-am-learning/): I believe in lifelong learning, and in this page, I share the things that I am learning. Mobile Phone Photography Mobile Phone Photography I wanted to learn how to take beautiful pictures quickly. So I went to Udemy to look for a good course on it. There are many courses on Udemy that teaches mobile phone photography with iphone, I took one that was meant for iphone. Though I’m not using an iphone, what’s taught there is applicable to other phones. The key features of iphone are also available on many andriod phone. Below are the notes that I took […]
- [Privacy Policy](https://rlwong.com/privacy-policy/): Who we are Our website address is: rlwong.com. Your privacy is important to us. We created this privacy policy to help you understand the data we collect.  This privacy policy applies to the use of our Website (rlwong.com and all its subdomains/ pages/ posts and so on),  newsletter subscribers, products, and any other services we may offer. Data We Collect and What We Use Them For Website visitors: We use analytics e.g. google analytics on our website. When you visit us, information such as visitor IP addresses, browsing behavior and information, device information may be collected. For details, please take […]


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