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Help! Why is my bacteria not growing as a lawn?
Ask an Expert Topic Forum: Grades 9-12: Life, Earth, and Social Sciences
Help! Why is my bacteria not growing as a lawn? Help! Why is my bacteria not growing as a lawn? Hello, I am doing a science project where i am testing the effectiveness of natural disinfectants vs commercial disinfectants on bacteria grown from surfaces, using the disc diffusion method. The first time I conducted a trial, i swabbed a sterile cotton swab all over a drinking fountain button, added one drop of distilled water in the centre of my agar plate and swabbed the bacteria evenly… Read more
Are the questions for my survey good enough.
Ask an Expert Topic Forum: Grades 9-12: Life, Earth, and Social Sciences
Are the questions for my survey good enough. Are the questions for my survey good enough. Hi I am doing a survey to find out why people are hesitant in taking the covid vaccine and I just needed an expert to determine if the questions where good enough and if there were any areas of improvement.I was also wondering if adding pictures to the survey would be more effective.Thank you for at least taking the time to read this Here is the link to the survey [link removed by moderator] Re: Are… Read more
Question about Make Your Own Harmonica! activity
Ask an Expert Topic Forum: STEM Activities
Question about Make Your Own Harmonica! activity Question about Make Your Own Harmonica! activity how to make a tyre space idea ------------------------------------- Re: Question about Make Your Own Harmonica! activity Hi - Your question doesn't seem to be about the Harmonica activity you posted on. If you are working on a science project and have specific questions, please explain more about your project. Amy Science Buddies Read more
What's the current flow and heat loss?
Ask an Expert Topic Forum: Grades 9-12: Physical Science
What's the current flow and heat loss? What's the current flow and heat loss? Hi, I got a different answer from the book. Please confirm the answer, my answer for question 1 was 0.0417A but the book is 0.046A. I do not know how to do question 2. Thanks [u] Question 1[/u] An energy saving bulb with 240 V power supply, produces 10 joules of light energy per second. Calculate the current flowing through the bulb. [u] Question 2[/u] Calculate the heat energy loss of the bulb… Read more
How do I wire it correctly? Please help
Ask an Expert Topic Forum: Grades 9-12: Physical Science
How do I wire it correctly? Please help How do I wire it correctly? Please help Hi, I encountered the attached question, somehow I only know that I should change the switch connection for fan B to live wire then I'm lost for the remaining parts. Please enlighten me on how I should have a complete and correct diagram for question a(ii). Thanks [attachment=0]Question.pdf[/attachment] Re: How do I wire it correctly? Please help Hello Sacred, If you are planning to do a hands-on science… Read more
Physics
Ask an Expert Topic Forum: Grades 9-12: Physical Science
Physics Physics Me and my friends want to do a science project about magnetic induction and use it to create electric energy but we don't know much about this so please help us :D Re: Physics Hello, Sounds like fun! Here's a link to a project you might enjoy with your friends. It also includes details on magnetic induction to help you get started. https://www.sciencebuddies.org/science-fair-projects/project-ideas/Phys_p097/physics/high-speed-magnets-faradays-law-lenzs-law Good… Read more
Vitamin c in OJ
Ask an Expert Topic Forum: Grades 9-12: Physical Science
Vitamin c in OJ Vitamin c in OJ Hi. As part of my science fair project I used DCPIP to try and work out the concentration of Vit C in store brought juices. We only had a small amount of DCPIP so pipetted small volumes of OJ into 1 ml volumes of DCPIP. Problem is all the literature works out mg of Vit C by titrating DCPIP into OJ and not the other way round. I didn’t do a standard curve, I just added the OJ to the DCPIP and now I can’t figure out how to work out the mg of Vit C in the OJ. Help… Read more
Can/should we to bring back/clone extinct species?
Ask an Expert Topic Forum: Grades 9-12: Life, Earth, and Social Sciences
Can/should we to bring back/clone extinct species? Can/should we to bring back/clone extinct species? For my science inquiry for the biology unit, I decided to look at cloning and the ethics behind that. I've got 6 supporting question to answer the main question which is "Can/should we to bring back/clone extinct species?" These are my supporting questions: Q1: Would extinct species survive in the present? Q2: Is it okay to clone some species but not others? * Q3: Is there a difference… Read more
What are the Best wireless dog fence reviews?
Ask an Expert Topic Forum: Grades 9-12: Physical Science
What are the Best wireless dog fence reviews? What are the Best wireless dog fence reviews? Concerning the collar, there are various kinds of imperceptible electrified barrier accessible with various advantages and disadvantages. The principal thought here is the kind of reaction seen once the creature arrives at the limit. Some discharge a static charge and other use commotions. Everything depends which you and your pet are generally OK with. It is likewise worth taking a gander at the… Read more
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