Ask an Expert (Page 159)

Catalase activity

Ask an Expert Topic Forum: Grades 9-12: Life, Earth, and Social Sciences

Catalase activity Catalase activity Hi, I am doing an Extended Essay project. My experiment was on measuring the catalase activity of cow (bovine), pig (sus scrofa)and chicken (Gallus Gallus). The results to this is that cow had high catalase activity, pig had 2nd fast activity and 3rd was chicken. But I don't exactly have an answer why it's the case. I have been trying to research on all sorts of areas but still couldn't find an answer. I researched on DNA sequences and comparison of them,… Read more

centrifugal force

Ask an Expert Topic Forum: Grades K-5: Physical Science

centrifugal force centrifugal force Ask an expert: I am a parent of 3rd graders (twins) who have a science project coming up in 2-3 months. I would like to help them do projects on the topic of centrifugal/centripetal force. I did a project on this topic when I was in school, but I want to see if I can get an idea of how to do it better/execute it better. I based my project (at the time) on the amusement park ride called The Rotor ( the one where you are spun in a cylinder and then held… Read more

Algae Biofuel and Control

Ask an Expert Topic Forum: Grades 9-12: Life, Earth, and Social Sciences

Algae Biofuel and Control Algae Biofuel and Control Hello I am part of Energy Project and are doing emphaty research for algae biofuel and containing the algae in a safe way. How can we prevent the algae from escaping its enclosure. What could attack algae and prevent it from growing as it should. Are there any specific environmental situations that prevents algae growth. Are there any common issues with algae we should be aware of. Do you believe that algae biofuel is a better… Read more

onion dna extraction

Ask an Expert Topic Forum: Grades K-5: Life, Earth, and Social Sciences

onion dna extraction onion dna extraction My daughter and I have performed this experiment about 6 times now and cannot really get the DNA to spool. It's really difficult to measure for comparison between different onions. Just wondering if we were doing something wrong. We've followed the instructions to our best ability and then tried slight variations within the instructions (ie pipetting the ethanol onto the top vs the bottom of the tube, etc. Thanks for any advice. Leanna and… Read more

Factors You know About Hacking ?

Ask an Expert Topic Forum: Grades 9-12: Math and Computer Science

Factors You know About Hacking ? Factors You know About Hacking ? Moral Hacking is regularly alluded to as the method involved with infiltrating one's own PC/s or PCs to which one has official consent to do as such as to decide whether weaknesses exist and to attempt preventive, restorative, and defensive countermeasures before a genuine trade off to the framework happens. Source :… Read more

Iodine Clock Reaction | HCl Substitute??

Ask an Expert Topic Forum: Grades 9-12: Physical Science

Iodine Clock Reaction | HCl Substitute?? Iodine Clock Reaction | HCl Substitute?? The Iodine Clock Reaction is a science project posted on Science Buddies measuring the reaction rate at which the dark blue complex takes to form. In the chemicals needed (provided by Science Buddies), HCl is included. Is there another alternative to the project to create the iodine reaction, perhaps without HCl? Or a possible substitute for HCl? I do not understand the need for HCl when another less… Read more

Soil Moisture Sensor Parts

Ask an Expert Topic Forum: Grades 9-12: Physical Science

Soil Moisture Sensor Parts Soil Moisture Sensor Parts Hello, I was wondering if I can substitute a 74HC595 IC for a CD4011 NAND gate IC (which is part of the kit)? Also does a 470 MΩ resistor work better than a 330 MΩ; does it matter if I don't use those exact types of resistors? What are the differences and will the sensor still work? Re: Soil Moisture Sensor Parts Hi - are you sure you got the right part number for the 74HC595? When I search for that part it is described as a shift… Read more

Questions about ISEF and tips for my incomplete project?

Ask an Expert Topic Forum: Preparing for the Competition

Questions about ISEF and tips for my incomplete project? Questions about ISEF and tips for my incomplete project? Hi! I recently qualified for the ISEF 2022 through my regional fair. I'm really excited, but I'm really lost as well. This is my first time qualifying and I don't have any older siblings to help me out. So far, my project is incomplete. For my project, I trained a computer model to detect normal and cancer glands in endometrial carcinoma. I'm hoping to create a python model with… Read more

Question about Build a Pizza Box Solar Oven activity

Ask an Expert Topic Forum: Grades 9-12: Physical Science

Question about Build a Pizza Box Solar Oven activity Question about Build a Pizza Box Solar Oven activity Type your question below and then press Submit! what type of heat transfer dose it use conduction convection or Radiation ------------------------------------- Leave this to help the Experts: The activity can be viewed at: [url=https://www.sciencebuddies.org/stem-activities/solar-oven]Build a Pizza Box Solar Oven[/url] [Administrator note - the project version of this exploration… Read more

Need help on properties of ionic and covalent compounds

Ask an Expert Topic Forum: Grades 9-12: Physical Science

Need help on properties of ionic and covalent compounds Need help on properties of ionic and covalent compounds 1. What are the properties of ionic compounds? 2. What are the properties of covalent compounds? Re: Need help on properties of ionic and covalent compounds Experts here in the forums can't help with homework questions. We suggest you first try doing some research online or using your textbook or any class resources. Amy Science Buddies Read more

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