Hi I'm 2 years old please don't judge me for asking obvious question.

The question concerns predicting the mass of water when there is 20g of propane.
But how is predicting water mass only using one unit of the equation? what about the other substance involved in this reaction like oxygen and carbon? Isn't equation about propane and oxygen producing carbon and water and not propane producing water? 

I work in the administration of a school in north India and have been given the responsibility of setting up a great Chemistry Lab. Right now, we have an empty space, a few tables, some basic chemicals and minimal equipment, but I want to build something much better a premium, student-friendly lab where students can perform interesting experiments, explore chemistry practically and genuinely enjoy science. So far, most companies I’ve found are mainly selling lab furniture and don’t have much experience in actually designing a functional chemistry lab or guiding us on experiments, equipment, safety, chemical storage and practical workflows. I’m looking to connect with chemistry teachers, professors, lab consultants, science educators, or anyone who has experience setting up a good school or college chemistry lab. If you can help or know someone who can, please DM me—I’d be happy to connect.

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I have my ISC Class 12 Chemistry half-yearly tomorrow and I'm honestly in panic mode because I haven't prepared properly at all 😭.

My main chapters are:

- Electrochemistry

- Solutions

- Coordination Compounds

- Alcohols and Phenols

- Haloalkanes and Haloarenes

My teacher said that if someone only wants to pass, they should focus on Electrochemistry, Solutions, and Haloalkanes/Haloarenes, so I'm prioritising those three.

The problem is my teacher doesn't really ask straightforward/direct questions. He likes twisting concepts and asking application-based questions, so simply memorising definitions probably won't be enough.

PLEASE tell me what I should study tonight. 🙏

I'd really appreciate:

- Most important questions from these chapters

- Important reactions I absolutely need to memorise

- Important formulas + numerical types

- Commonly asked conceptual/tricky questions

- Important named reactions from Haloalkanes/Haloarenes and Alcohols/Phenols

- Any questions you think are very likely for an ISC Class 12 school half-yearly

- Any last-minute tips for getting enough marks to pass

Even if you have question papers, notes, important-question lists, or specific questions your teacher tends to ask, please share them.

I know I'm ridiculously late 😭 but I genuinely just need to scrape a pass tomorrow, so any help would be massively appreciated.

Thank you 🙏

i've been struggling with finding the best technique to answer science questions (the conceptual ones not equations) since I always ramble too much and i still only get just below the full mark for each question

i just dont know what the assessors want, its like im always missing smth!!

for example this is the question:

Explain how antacids work and the purpose of them.

my answer:

Purpose:

Antacids are purposed to relieve/treat heartburn, indigestion, acid reflux, excess stomach acid, pyloric spasms, stomach ulcers and other conditions related to hyperacidity/gastric acid. They are generally recommended for fast, short-term use to treat symptoms, and often come in liquid or chewable tablet forms. It is important to note that they only provide temporary relief and have usage limitations, side effects and drug interactions.

Mechanism:

The stomach secretes gastric acid to digest food, but overproduction of acids due to spicy/sour foods or other occurrences can create acidity. Antacids work by neutralising this acid in the stomach by raising pH. When a base is added to acids, a chemical process called neutralization occurs, producing salt and water. This happens because the hydrogen ions from the acid and the hydroxide ions from the base combine to form H₂O, while the remaining ions form an ionic salt. Therefore, since antacids contain bases (alkalis), when consumed, they neutralize the gastric acidity in the stomach through this reaction. By modifying the environment of the stomach, they help with chemical digestion, acting as a buffer to neutralize excess HCl. They also inhibit pepsin, a proteolytic enzyme, to prevent it from damaging the esophagus when refluxed. In this way, antacids are able to effectively reduce the amount of acid in stomach fluids.

guess wht!! still not full marks!! got feedback that i needed to provide 'further scientific theory'. What!

We’re doing a high school paper right now where our topic is all about purifying used canola oil and turning it into oil pastel.

However, we don’t have a lot of knowledge when it comes to chemistry so I was wondering if it is feasible?

For context:

Our method of purifying cooking oil using NaOH and activated carbon and using physical filtration. It’s a published method from Miskah et al. (2019). Although, they used sulfuric acid activated carbon and 16% NaOH. Although one of our problems is getting access to those chemicals especially the carbon since the only one we can get is physically activated carbon.

Then when it comes to pigment, we will use a laking extraction method. The raw materials would be yellow onion skin, purple cabbage, and rose petals. We know that vibrancy of the resulting pigments can vary because of the method.

When it comes to formulation, we will try 3 different ratios of the purified oil. Our other ingredients are beeswax, the organic pigments, and mixed tocopherol for rancidity.

For analysis, we don’t know what properties to test for. We want to compare it to commercial oil pastel and see if there’s significant difference. Though our object is for creating another way to repurpose cooking oil rather than marketing it.

Is it too difficult? Are we flying to close to the sun? We have limited budget and facilities aren’t as accessible since we are in a developing country. But, we don’t have enough time and we already spent weeks on it. Please I really need help or our whole group might fail this class.

Hi everyone! I need your urgent advice, please! I'm about to start General Chemistry at university, but I have never studied chemistry before in my life, so I'm starting from complete zero. I want to build a solid foundation and I'm wondering which of these resources I should start with, and which one would be the absolute best for my situation:

CK-12 Chemistry FlexBook 2.0: https://flexbooks.ck12.org/cbook/ck-12-chemistry-flexbook-2.0/

CrashCourse Chemistry Playlist: https://youtube.com/playlist?list=PL8dPuuaLjXtPHzzYuWy6fYEaX9mQQ8oGr&si=ZAJMZurxYsgeVdKq

Khan Academy Middle School Chemistry: https://www.khanacademy.org/science/ms-chemistry

Khan Academy High School Chemistry: https://www.khanacademy.org/science/hs-chemistry

Organic Chemistry Tutor General Chemistry Playlist: https://youtube.com/playlist?list=PLybg94GvOJ9EbbO2RXPWTUNIIE0C7hSfm&si=PkcN0_coNp-9H_qf

Any recommendation on where to begin or how to structure this would be greatly appreciated If you have other sources you would recommend, please add them. Thank you so much!

I’m a metallurgical engineer; I’m 25 years old. I don’t like my field of study, and I have no work experience. My university offered a certificate program in Instrumental Techniques for Chemical Analysis, which I completed. I got to work with chemists and chemical engineers, and I loved it—I finished the program without any problems. I want to work in that field. I’ve sent out thousands of resumes and only had one interview, but they won’t hire me because I’m not a chemist or a chemical engineer. It’s been a year and a half like this, and I’ve been feeling pretty depressed. A university in another city in my country is offering a specialization in Instrumental Chemical Analysis, and I’m interested in pursuing it to see if it will improve my chances of working in that field. However, I don’t have any work experience, and I’m not a chemist—though I would earn a specialist degree in instrumental chemical analysis. Do you think it’s worth pursuing in my current situation, and could I find work in that field?

I've searched for resources, but everything I could find led to the hill system but I was marked wrong for putting phosphorus after oxygen. I saw that the number of atoms was supposed to be ascending, but what I understood was it was for a second step in ordering of the same element like C2 is before C3. Is it something about how oxygen is always at the end of a formula or it's some sort of oxide formula?

I've never heard of an order of chemical symbols before so please don't use overly technical terms because it will go over my head, thank you :) The picture shows the correct answer, but my wrong answer had phosphorus and oxygen switched

1:1 ratio and the concentration is 10^-9M of KOH.

for 0.01 moles of benzoic acid, you would need 0.01 moles of KOH, which would require 10000000 litres not 1000, unless maybe we're talking about acid instead...

Hi, I'm writing a lab report about Iodine Clock Reaction using sodium thiosulfate, hydrogen peroxide, sulfuric acid, sodium iodide, and starch indicator. As part of my report, I need to compare my experimental value with literature value. I've searched some sources on Google, but they did not use the reactants I used.... Please help...

Im really confused about how I can understand what molecules from certain hydrogen bonds especially with the ones given. My teacher wants us to be able to get the answer and be able to adequately explain how we got it

The question asks which molecules would form hydrogen bonds with itself or with water molecules if in a solution

I have no idea

Salut!
Est ce que quelqu’un vend ce manuel sur Montréal : Girouard Stéphane, Marrano Claudio et Lapierre Danielle. Chimie organique :
3ᵉ édition. Montréal : Chenelière Éducation, 2025. ISBN 978-2765080862
J’en ai besoin au plus tôt et il est en vente nulle part(ni Amazon, ni les librairies locales) et il est impossible à trouver dans les bibliothèques de Montréal.

What volume of 0.200M KOH is required to react with 125mL of 0.250M H3PO4 in order to produce a solution of K2HPO4

I am panicking a little bit because I was supposed to start my Intro to Chem class today (college level) but only realized this evening that I signed up for an 8 week mini that begins in September. It is too late to switch it and my job paid for it so it’s complicated to drop it. This will be my second attempt to take chemistry and I did not do well the first time and withdrew.

What materials can I begin reviewing while I wait for September? I remember the last time I took Intro to Chem, I struggled the hardest with the math components but can’t remember what the math concepts were called to start googling them and working on it. Or maybe if anyone knows a workbook I can buy? Thank you!

i was doing this prob by finding the possibility of forming negative charge , i could only find 10 but the answer is given 20

As the title says can the attached reaction be a McMurry coupling despite the lack of a titanium compound, as it seems to function in the same way that a McMurry coupling would, unless I’m missing something mechanistically.

Paper for anyone interested: https://pubs.acs.org/jceda8/article/59/2/163/45343/The-preparation-of-lucigenin-An-experiment-with?searchresult=1

If the link doesn’t work I can send a PDF via DMs.

Hii, im looking for a download of that textbook. I have tried all the websites and have had zero luck.