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Science Experiments
Experiments often conducted by students to test different scientific theories and hypotheses
11,111 Questions
How do you optimise peak separation in HPLC?
Peak separation in HPLC can be optimized by adjusting parameters such as column length, particle size, mobile phase composition, flow rate, and temperature. Increasing column length can improve separation, while decreasing particle size can enhance resolution. Adjusting mobile phase composition can also impact peak separation by changing selectivity. Optimization is typically achieved through systematic experimentation and adjustment of these parameters.
You can put contents of a can of Coca Cola into a load of wash to remove oily residue.
A pipette is used to accurately measure the volume of a liquid in the laboratory. In the school laboratory the pipette is usually a glass bulb with a glass tube on either end. There is a line on the tube to indicate how high to fill the pipette to measure the required volume.
What are the two natural elements found in water?
The two natural elements found in water are hydrogen and oxygen.
What melts faster milk juice soda or water?
Milk, juice and soda are likely to melt faster than water since they all contain sugars, salts and other solutes that lower the freezing point and make them more prone to melting. Water, being a pure substance, has a higher freezing point and is likely to melt slower.
Who discovered electromagnets?
The Danish physicist Hans Christian Ørsted (or Oersted written in the English alphabet) is normally said to be the first to connect electricity with magnetism when he noted in 1819 that a compass needle deflected toward a wire coil carrying electric current.
This was later supported by experiments done by André-Marie Ampère in 1821, at the same time as Thomas Seebeck investigated heat-produced electromagnetism (the thermoelectric effect) in metals.
The list of investigators is a long one, and includes Michael Faraday and Benjamin Franklin. See the related links below.
Faraday reasoned from Oersted's observation that electricity caused a magnetic needle to move, that magnetism could cause electricity. Faraday produced electricity to prove his point by creating a generator. Faraday also had the idea of electromagnetic fields, invisible lines of force.
Some other names to add to the list:
- Heinrich Lenz
- James Maxwell
It was later in the 19th century when the most progress was made in understanding electromagnetics. James Clerk Maxwell, Michael Faraday, Nikola Tesla, Thomas Edison, George Westinghouse, Ernst Werner von Siemens, Alexander Graham Bell and Lord Kelvin all made contributions to a further understanding of the nature of the electromagnetic force. By the 20th century, we had a pretty good handle on electromagnetism, and we could use it to make electricity and electric motors and so many of the things that make our world "modern" and give us all the comfort and convenience we enjoy today - even though we may not think very much about it.
There are some links below, and they will take the curious investigator to relevant Wikipedia articles.
James Clerk Maxwell published his treatise on the connected nature of the forces in 1873. Prior to that time, a distinction was being made between electrostatic attraction (non-electrics) and ferromagnetism (electrics). Charged objects attracted lightweight objects regardless of their substance, but only metals responded to iron magnets.
What is Potassium Hydroxide used for?
* Correction of the pH of acidic soils[7] * As a fungicide[8] * As a herbicide[9] * KOH test[10] (to diagnose fungal infections). * Whiff test[11] (to diagnose bacterial vaginosis). * In botany and mycology, an aqueous solution (typically 10% or less) of KOH is used to rehydrate dried herbarium material in preparation for microscopy. * In palynology, an aqueous solution of KOH is used to deflocculate soil particles aggregated onto pollen grains. * wart and cuticle solvent. * (veterinary medicine) disbudding calves horns; dissolving scales and hair. Food uses of KOH include: * Washing or chemical peeling of fruits and vegetables * Chocolate and cocoa processing * Caramel color production * Poultry scalding * Soft drink processing * Thickening ice cream * Soaking of olives to soften them and neutralize natural acids * Glazing of pretzels and German lye rolls before baking to make them crisp. * Soaking of cod to make the Scandinavian delicacy known as lutefisk (from lutfisk, "lye fish"). Cod is soaked in KOH to a jelly-like consistency, then served with bacon fat, potatoes, brown cheese (brunost) sauce and mushy peas. * Making of hominy, which is dried maize (corn) kernels reconstituted by soaking in KOH. KOH is a major industrial chemical because it is used as a base in a wide variety of chemical processes. Some uses of KOH include: * Acrylate ester copolymer coating * Anti-foaming agent used in the manufacture of paper [12] * saponifying oils for liquid soap * Formulation aid for food[13] * pH control agent (raises pH by neutralizing acids) * Making polyethylene resins * Textile processing * As a catalyst in reactions like the production of biodiesel[14]. * Manufacture of many cleaning products[15], such as: ** Washing powders ** Cleansers (for tubs, tile, etc) ** Some denture cleaners ** Non-phosphate detergents ** Drain or pipe cleaners (clog dissolvers) ** Widely used in carpet cleaning degreasers * Manufacture of alkaline batteries, which use an aqueous solution of KOH as an electrolyte[16]. Thus, potassium hydroxide helps to power flashlights, smoke detectors, and other battery-powered household items. * As an anisotropic etchant of silicon[17], exposing octahedral planes. This technique can create pyramids[18] and regularly-shaped etch pits for uses such as microelectromechanical systems. * An anisotropic etchant of GaAs[19], exposing Ga and As {111} planes. This technique can create rectangular etch pits by etching As (111) plane faster.
Taken from Wikipedia
What are the units for energy?
In the SI system the units are Joules. You can also use ftlbf (footpoundforce). For thermal energy use calories or BTU
How does closing a door keep the sound out?
Closing a door creates a barrier that reduces the pathways through which sound waves can travel, helping to block and absorb sound. The solid material of the door acts as a physical barrier that prevents sound waves from easily passing through, thereby reducing the level of noise that enters or exits a room.
Can energy be converted from one form to another?
Yes, there are many examples. Electrical energy to light energy (light bulb). Mechanical energy to heat energy (rub your hands together). Chemical energy to light energy (a glowstick), and on and on.
Why does water freeze before alcohol?
The freezing point of alcohol is much lower (colder) than the freezing point of water. The freezing point of water is 0 °C, but the freezing point of ethanol is -114 °C.
See the Related Questions to the left for more information.
think of density
Striking experiment with straight sided glass?
A person can perform an experiment with a straight sided piece of glass to see if it has more strength when it is hit while it is horizontal or vertical. It has been proven that a piece of glass used in an automobile will have more strength when it is hit at an angle. This is why the windshield on a car is not straight up and down like a window would be.
Electrostatic energy is the potential energy stored in an object due to its electric charge. It is created by the interaction of charged particles in the presence of an electric field. This energy can either attract or repel charged particles based on their polarity.
Why does magic mud go hard and liquid?
Magic mud is a non-Newtonian fluid, which means its viscosity changes based on the force applied to it. When gentle pressure is exerted on magic mud, its particles align to form a solid-like structure, making it hard. But when exposed to quick and forceful movement, the particles separate and slide past each other easily, turning it into a liquid.
Measuring cup laboratory apparatus?
A measuring cup is a simple laboratory apparatus used in scientific experiments to accurately measure the volume of liquids. It is typically made of glass or plastic and comes in various sizes, facilitating precise measurements for use in experiments and research. To ensure accuracy, measuring cups are calibrated to display volume markings in milliliters or cubic centimeters.
A barrel is a unit of liquid measure equivalent to?
One barrel is equal to 42 gallons or 5.6145833 cubic feet.
Where can you find a graph of atomic radius vs atomic number?
See the Web Links to the left for the answer.
The AntoineFrosturg.edu page has a graph of atomic radius versus atomic number.
The HMCO.com page has an interactive feature where you can individually plot the atomic radius for each row or column of the periodic table.
The other two sites have tables with the actual numbers for the atomic radii. Go to wikipedia.org and look up atomic radius, they have 2 charts for it.
What is the calorific value of petrol diesel and unleaded petrol?
Fuel Type Higher Calorific Value
(Gross Calorific Value - GCV) kJ/kg Btu/lb Diesel 44,800 19,300 kJ/l Btu/gal Kerosene 35,000 154,000 Gas oil 38,000 164,000 Petrol (kJ/kg) 48,000 Petroleum (kJ/kg) 43,000
A constant volume thermometer measures temperature by keeping the volume of the gas inside the thermometer constant. As temperature changes, the pressure of the gas inside the thermometer also changes, which can be correlated to the temperature. This type of thermometer is commonly used in laboratories and for precision measurements.
What is the word formula of Fe2SO4?
FeSO4: the IUPAC name is "iron (II) sulfate", the "old" terminology for FeSO4 is "ferrous Sulfate"
What happens to particles of a solute when they dissolve?
Particles of a solute separate and disperse uniformly throughout the solvent. This process occurs due to interactions between solvent molecules and solute particles, breaking intermolecular forces in the solute. The solute particles then become surrounded by solvent molecules, forming a homogenous solution.
What are some examples of a gas gas solution?
One example of a gas dissolved in another gas is atmospheric air - oxygen and carbon dioxide dissolved in nitrogen.
For gases the term mixture is more correct than solution.
What is the definition of xion?
she is apparently an imperfect replica of sora mainly made of mainly of some leaked memories of his about kairi....
Disclosed is a method for preventing hydrogen-induced disbanding of austenitic stainless steel cladding, which is made on a low alloy steel, in a reactor vessel which has been used in a high-temperature and high-pressure hydrogen atmosphere so the air must be excluded. The clad steel is cooled from its operating temperature to a temperature which is not lower than 100° C. Then, the clad steel is maintained at a temperature between said temperature which is not lower than 100° C. and a post weld heat treatment so as to effect hydrogen degassing treatment. Thereafter, the clad steel is further cooled.
a test rubber stopper is used to close the tops of test tubes and flasks.
It's like a cork to close off narrow-mouthed things like bottles, test tubes and flasks, except it's made of rubber and not cork.
