Gennadii

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Gennadii
ruderge, tutor Геннадий

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About me:
- Member of groups:
- Учительская
- Tests Results:
- Authored 17 projects
- pH of Your Local Pond or River
  
  Let’s check the acidity of the water in our river, pond or lake. Do pH levels change over the course of a day? Is there a relationship between acidity and eutrophication, when a body of water loses its oxygen and becomes a marsh?
  
  Проф. Борис Беренфельд
  Arseny Lebedev
  Геннадий
  
  4 0 5
- Souring of the Milk
  
  Fresh milk right from the cow has a pH value that is almost neutral. Gradually, however, milk becomes sour, even when it is stored in a refrigerator. In this investigation we will see if we can tell how many days old the milk is simply by measuring its pH. We will also investigate the microorganisms at work in its change in acidity.
  
  GlobalLab
  Проф. Борис Беренфельд
  Arseny Lebedev
  Геннадий
  
  15 3 47
- Plant Whisperers
  
  Plants can sometimes reveal pH. This is because some plant can live only in soils with narrow and specific ranges of pH. We’ll explore whether we can tell the pH of the soil just by the plants that grow there.
  
  GlobalLab
  Проф. Борис Беренфельд
  Arseny Lebedev
  Геннадий
  
  5 0 0
- Soil pH
  
  Soil is a complex ecosystem that is home to many organisms, which determine its fertility. The pH of soil affects the development of organisms that inhabit it and the solubility of minerals. Working together, we can map soil pH and, at the same time, find out if the color of the soil indicates its acidity.
  
  GlobalLab
  Проф. Борис Беренфельд
  Arseny Lebedev
  Геннадий
  
  2 3 11
- Natural pH indicators
  
  Litmus, methyl orange, and phenolphthalein are well-known and broadly used acid-base indicators. But did you know that some plants can also be used as indicators?
  
  Виктория Денисова, учитель
  GlobalLab
  Наталья Сандецкая
  Проф. Борис Беренфельд
  Arseny Lebedev
  Геннадий
  
  87 16 323
- Searching for the Most Acidic Citrus
  
  Every citrus fruit contains organic acids, such as citric acid and ascorbic acid, also known as vitamin C. Yet limes or lemons taste quite acidic while oranges or mandarins are on the sweet side. Which among citrus fruits is the "world champion" in acidity? Is there a correlation between acid taste and pH-levels? Are there variations in pH for the same citrus fruit grown in various countries, regions or climate zones. Those questions will be explored in this activity.
  
  GlobalLab
  Проф. Борис Беренфельд
  Arseny Lebedev
  Геннадий
  
  29 22 63
- Getting on the Same Page: Calibration
  
  When we look for answers in GlobalLab, we base our conclusions on data we all submit. But when we use probes and sensors, and since each of us uses our own instruments to collect data, how can we know whether our findings can be compared? How do we know our instruments even measure their target, in this case pH, or measure with comparable accuracy? What can be done so we can trust each other’s findings? For pH measurements scientists use a procedure called the calibration of pH probes. We check how accurately our probes and sensors measure pH by first measuring so-called ‘standard solutions,’ those with pH values we already know, since we either prepared them ourselves or purchased them from chemical catalogs.
  
  GlobalLab
  Проф. Борис Беренфельд
  Arseny Lebedev
  Геннадий
  
  9 0 12
- Does pH Go with the Fizz?
  
  What happens to unfinished soda? Many soft drinks are easy to tell apart by their tastes; they all are made from different recipes. But what they have in common is the presence of carbon dioxide. Compare the original acidity of soda with what happens to pH levels as the soda loses its carbonation and goes “flat”.
  
  Проф. Борис Беренфельд
  Arseny Lebedev
  Геннадий
  
  12 0 12
- pH & Temperature
  
  What if you measure the pH of a chilled solution that you just removed from the refrigerator, and somewhere else, others measured the pH of the same solution but at room temperature on a warm day? Does the temperature of a solution affect its pH? If so, what does this mean for our investigations into pH? Should we measure pH when the solutions are at the same temperature?
  
  GlobalLab
  Проф. Борис Беренфельд
  Arseny Lebedev
  Геннадий
  
  11 2 16
- Куда исчезает обыкновенный хомяк?
  
  Обыкновенный хомяк сейчас исчезает во всей Европе. А что происходит с этим животным в России, никто не знает. Попробуем разобраться.
  
  Геннадий
  
  5 0 13
- Food Preservation and pH
  
  Sometimes people preserve fruits by adding water, sugar, and some spice to make a fruit preserve, and then putting the preserve in a tightly sealed jar. But when fruit preserves are stored in a warm place, they start fermenting, which is a chemical breakdown by microorganisms like bacteria, and they get sour. What does this process have in common with the souring of milk?
  
  GlobalLab
  Проф. Борис Беренфельд
  Arseny Lebedev
  Геннадий
  
  7 0 0
- pH of Your Saliva at Rest and Under Stress
  
  Everyone can recall the dry mouth we experienced before a big exam or performance. Yet when we’re alone, especially before lunch, the saliva in our mouths is very different. We’ll compare the acidity of saliva before and after meals, when alone, and in stressful situations.
  
  GlobalLab
  Проф. Борис Беренфельд
  Arseny Lebedev
  Геннадий
  
  3 1 8
- Water pH of bottled water
  
  Many people drink bottled water with and without carbonation. Let's compare the acidity of carbonated soda and water without carbonation. Let’s also see if the pH of soda changes if the bottle is left open for a long time.
  
  GlobalLab
  Проф. Борис Беренфельд
  Arseny Lebedev
  Геннадий
  
  2 0 11
- The Water You Drink
  
  To avoid problems with your teeth or your health in general, the pH of tap water you drink should be close to neutral. But what is the actual pH of the tap water you drink? Does the pH of tap water change over the course of the day? Does it change day by day? Or after a large rainfall or snowstorm?
  
  GlobalLab
  Проф. Борис Беренфельд
  Arseny Lebedev
  Геннадий
  
  5 0 12
- Acid Rain
  
  What is acid rain? Where does it come from? Can acid rain affect the environment? In this investigation, we will monitor the pH of rain and snow, overlaid with wind speed and direction, to get a sense of where acid rain comes from.
  
  Михаил Гантман, кандидат химических наук
  GlobalLab
  Проф. Борис Беренфельд
  Arseny Lebedev
  Геннадий
  
  42 11 44
- Sweet Apples & Ripe Seeds. Is There a Relationship?
  
  Animals are distributors of seeds. They eat fruits and expel seeds, enabling new plants to grow far from the mother plant. The sweeter and riper the fruit, the more attractive it is to animals. But are seeds ready for germination when their fruits are most ripe? Let’s find out, using apples.
  
  GlobalLab
  Проф. Борис Беренфельд
  Arseny Lebedev
  Геннадий
  
  2 0 9
- Птичий разум
  
  По расхожему мнению, поведение птиц регламентируется исключительно инстинктами. Но это не так! У птиц есть ещё и интеллект, который они весьма активно используют. Давайте поищем вокруг себя примеры разумного поведения птиц!
  
  Елена Чернова, сотрудник Союза охраны птиц России
  Молодцова Ирина, координатор
  Геннадий
  GlobalLab
  
  11 13 35
- Participating in 1 project
- - Люди-птицы: «совы», «жаворонки», «голуби»
    
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