Elements and Compounds
Atoms and Atomic Structure
Acids and Bases
Math and Arithmetic
This category encompasses all questions about the composition, structure, properties, and reactions of matter.
Asked in Science, Chemistry, Acids and Bases
What are some examples of chemical and physical changes?
Physical Changes Change of state (such as from solid to liquid or from gas to liquid) Specific examples of state change include water freezing, alcohol evaporating and dry ice (solid carbon dioxide) subliming Absorption of water into a towel Crumpling a piece of paper Pulling copper into a thin wire - a change of shape, but not a change of composition Cutting a material such as wood Tearing a piece of tin foil Breaking glass Deflating a basketball Mixing different solids (such as solid sulfur and iron filings) Inflating a volleyball Cloud...
What type of element is a protactinium?
I'm not too bad at chemistry, but one thing I can't wrap my head around is how perfect the periodic table is. How is it that each element that we know is only one more proton than the last? How come it goes in PERFECT order instead of having a few elements with protons not perfectly linear to the periodic table?...
How do you determine if a molecule is polar or non-polar?
Polar Bonds and Molecular Shape A polar molecule is a molecule that has a net dipole moment due to its having unsymmetrical polar bonds. There are two factors that go into determining if a molecule is polar or not. To determine if a molecule (or ion) is polar or non-polar, you must determine both factors. The polarity of the individual bonds in the molecule. The shape or geometry of the molecule. First, to determine if a given individual bond is polar, you need to...
What is the percent error formula?
Percent Error is the difference between the true value and the estimate divided by the true value and the result is multiplied by 100 to make it a percentage. The percent error obviously can be positive or negative; however, some prefer taking the absolute value of the difference. The formula is the absolute value of the experimental value (minus) the theoretical value divided by theoretical value times 100. % error = (|Your Result - Accepted Value| / Accepted Value) x 100 ...
Asked in Chemistry, Gold and Precious Metals
What is the formula of white gold?
Well,white gold never existed, but any industry to create the best white gold formula alloys is the one go to make big money. Because the consumer is looking for the best precious metal alloys; any person that has his or her own real pure solid white gold formula alloys, is not in their best interest to specify the formula to any other person. In this world we have more that 181 precious metals to combine to produce your own white gold...
10 examples of physical change and chemical change?
Physical Change: *Milo dissolves into hot milk *A plate is dropped and shatters *Grass in mowed *Metal Knife is sharpened *Breakfast Cereal goes soggy Chemical Change: *Wood burns to form black charcoal * A green tomato ripens and turns red * Fireworks explode to form colourful light and loud sounds * Vegetables scraps in the compost bin decompose to form rich soil * An egg is cooked to become a white and yellow solid ...
Which science is the most complex chemistry or biology or physics?
Biology is the most complex because it deals with living organisms and number of known organisms is more than two and a half million while un-described species are estimated up-to 30 million . each organism is different from other and has its peculiarities . Chemistry deals with matter, with 92 natural element and nearly thirty synthetic elements . Number of organic molecules is quite large but much less as compared to species. ...
Asked in Chemistry, Law & Legal Issues
What gas law applies to aerosol cans being stored in a cool place?
Don't really know if this is what your asking but P1/T1= P2/T2 should show how the pressure varies with temperature (V is left out because it's constant since the gas is trapped in an aerosol can). As the temperature rises the pressure rises and if it gets too high then the can explodes, which is why it should be stored in a cool place. There's also PV=nRT might be kind of hard to find moles (n) though. the ideal gas law will...
What does Fe500 steel mean?
The abbreviation Fe stands for Ferrous material ie iron from which the reinforcement steel bars are manufactured. The reinforcement steel bars used in RCC (Reinforced Cement Concrete) are designated as Fe415 or Fe500 depending on their Yield Strength. (The numbers 415 and 500 tell about this Yield Strength in N/mm2 the bars are designed and manufactured to have.) As per IS : 1786 Yield Stress (also known as 0.2% proof stress) of Fe 500 is 500 N/mm2. So, Fe500 steel means the reinforcement steel rods...
Asked in Chemistry, Philippines
Who are some famous Filipino chemists and what are their contributions to the field of chemistry?
Filipino Chemists and their contributions Julian Banzon - experimented with the production of ethyl ester fuels from sugarcane and coconut and invented a means of extracting residual coconut oil by a chemical process rather than a physical process. A pioneer for alternative fuels ROM the 1930's and 40's. Francisco Quisumbing - invented Quink ink (currently used in Parker Pens) which is a quick drying ink that prevents the ink from clogging the pen. Ramon Barba - created crop flowering techniques using a potassium nitrate spray. Due...
Asked in Science, Physics, Chemistry, Chemical Bonding
Why does water have a high and specific heat capacity?
First, we need to know a little bit about water. Water is a polar molecule because oxygen bears partial negative charge and hydrogen bears partial positive charge. This results in extensive hydrogen bonding in water molecules between slightly negative oxygens and slightly positive hydrogens. Second, we need to remember that temperature is another way of saying the average kinetic energy of particles - the higher the temperature, the faster they move, in the case of gases and liquids, or vibrate, in the case of...
Asked in Chemistry, Elements and Compounds
How will you justify water is a compound?
See related questions. Water is made up of elements Hydrogen and Oxygen with the chemical formula: H2O. It can easily be disassociated with electrolysis into the elements Hydrogen (H2) and Oxygen (O2), and reformed with combustion. It has aspects of both covalent and ionic bonds. It is generally considered neutral, but can be a proton donor to act as a weak acid. H2O --> HO- + H+. It can also act as a weak base, being a proton acceptor. H2O + H+ --> H3O+. ...
Asked in Cleaning, Chemistry, Manicures and Pedicures
How do you remove nail polish stains from your carpet?
I'm a material researcher and I've reviewed this extensive answer. There are many inaccuracies and bad advice here, along with extremely effective and absolutely clear recommendations that should work very well. Nail polish is, for practical intents and purposes, a form of nitrocellulose lacquer. Nitrocellulose, the first plastic ever invented, is an excellent coating material for human cuticle, and that's why it's used in nail polish. But if it spills and gets on something unintended, it can make a difficult stain. To effectively remove...
Asked in Math and Arithmetic, Chemistry
What are negative ligands?
Any negatively charged species that is able to donate its lone pair to the metal is called a negative ligand. For example, Cl- , Br-, SO4-2, C2O4-2. The name of the ligand will end with O (i.e. sulphate will become sulphato, nitrite will become nitrito etc.) ...
Asked in Chemistry
Is sperm good for your skin?
== == First of all, lets assume you mean semen. Sperm are the little swimming guys you see in reproduction videos; semen is the lubricative substance that surrounds them and can exist free of sperm. Yes, it is good for the skin. Semen is not only rich in vitamin "E" but it is a natural lubricant that moisturizes the skin and causes it to glow. * The reported 'salty' taste is from ammonia salts picked up from the urethra, these salts are...
Asked in Chemistry
Is air a mixture or a solution or a compound or an element?
Air is a mixture of gases (and not a compound), about 78% being nitrogen (an element) , about 21% oxygen (another element), and all other gases present in much lesser amounts. The remaining 1% is made up of argon (0.93%), carbon dioxide (0.039% as of 2010) and other trace gases (0.003%). Water vapor (water in its gaseous state) is also present in the atmosphere in varying amounts, by up to 2%. If you live in Florida in the summer rains, or...
Asked in Chemistry, Science, Sports
Why is science defined as a product and a process?
This is because science is not just the information presented (the product), but also the way in which that information has been collected (the process). While scientific knowledge should be testable and falsifiable (according to Karl Popper), the way in which such information has been gathered is also important. Science should be unbiased and experiments should be repeatable by different individuals. There are different philosophers who argue on the way science proceeds. (see Popper, Kuhn, Lakatos and Feyerabend) ...
Asked in Chemistry
What are the names and uses of the various laboratory tools?
Laboratory Tools and Apparatuses Tools include beakers, microscopes, tweezers, hot plates, lasers, volt meters, test tubes, Erlenmeyer flasks, thermometers, test tube racks, Bunsen burners, crucibles, tripods and more. They are used to measure, observe and gather data for experiments, as well as to safely perform reactions and to heat things. More advanced laboratory equipment includes items such as spectrometers, centrifuges and chromatographs. Of utmost importance are these safety tools: Eye wash: In case materials get into your eyes, use this to rinse them out. Safety shower: In...
What is orbital mixing?
In chemistry, orbital hybridization (the preferred term) comes from a sort of "mixing" of the individual pure solutions of the wavefunction (the orbitals) to form a hybrid orbital with characteristics that are somewhere in between the two. ...
Asked in Chemistry, Acids and Bases, Metal and Alloys
What happens when dilute acids react with chemically active metals?
Hydrogen gas is evolved along with the formation of a salt. For example, when hydrochloric acid (HCl) is reacted with magnesium (Mg): 2 HCl + Mg --> MgCl2 + H2 ...
Asked in Chemistry
What organisms use energy from the sun or stored in chemical compounds to manufacture their own nutrients?
Producers are organisms that use energy from the sun or stored in chemical compounds to manufacture their own nutrients. ...