The observation, identification, description, experimental investigation, and theoretical explanation of phenomena is all part of science. Nothing is immune to the scientific process: from charm quarks that haven't existed naturally since the beginning of time to Pluto, recently demoted from planet to dwarf planet. Questions on knowledge about the material and physical aspects of our world are asked and answered here.
How is the biome of northern Alaska like that of Arizona?
The amount of energy the atmosphere absorbs depends in part on its level of?
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 forming in the sky Chemical changes Burning a log of wood Mixing an acid with a base, producing water and a salt. Photosynthesis - a process in which carbon dioxide and water are changed into sugars by plants. Cracking heavy hydrocarbons to create lighter hydrocarbons (part of the process of refining oil). Cooking examples: popcorn, cake, pancakes, and eggs Oxidation examples: rust or tarnishing Combustion Mixing chemicals Rotting of fruit Cooking rice Explosion of fireworks Tarnishing silver Lighting a match Chewing/digesting food Rusting nail Burning gas in a stove Oxidizing food for energy Roasting a marshmallow Adding food coloring to icing Frying an egg Burning a magnesium strip The following can indicate that a chemical change took place, although this evidence is not conclusive: Change of color (for example, silver to reddish-brown when iron rusts) Change in temperature or energy, such as the production (exothermic) or loss (endothermic) of heat Change of form (for example, burning paper) Light, heat, or sound is given off Formation of gases, often appearing as bubbles Formation of precipitate (insoluble particles) The decomposition of organic matter (for example, rotting food)
What are the advantages of selective cutting and clear cutting?
Asked in Science
How does the shape of the root hair cell help to do its job?
What occurs to the reducing agent in a reduction reaction?
Asked in Science
Social institutions are what of the socialization process?
Why is it important that fehlings solution be freshly prepared?
Asked in History of Science, Science, Superstitions
What superstitious beliefs have a scientific basis?
Superstitious belief, by definition, have no scientific basis. Science requires that ideas are tested in a way that is repeatable and falsifiable. Falsifiable means that there must be a way that the test shows that a stated belief is not true, while most superstitions rely on metaphysical entities or powers that are so vague they can not be dis-proven. Here are some examples of superstitions, and where they may have come from. Breaking a mirror is seen as seven years of bad luck from a historical root. Back in the medieval times mirrors were very expensive. And if you broke one, it was reguarly someone important, such as the lord of the kingdom of the king or a high-ranking nobleman. And if you broke it, it was common that if they were un-forgiving, they would put you in jail, possibly for seven years. Walking under a ladder is seen as bad luck Typically a ladder means someone at the top of the ladder and that person can easily drop things - onto your head. So it really is a bad idea to walk under one. Never sweep the floor at night or you'll sweep sorrow into your life. You may not be able to see where you're sweeping and fall and get injured. Chase away any owls outside your window; they are a harbinger of death. They may erode your windowsill by pecking on it, and when you lean on it, it may break and you may fall. Never start or buy anything on a Friday. Since Friday is the last business day, you or your order will probably not be active on the weekend. Cut your hair on a full moon and it will grow back faster. Well, if you cut your hair at a barber's shop, and you can see the moon, the barber will probably bee in a hurry to leave and so will give you a shorter haircut. Crickets in your home are good luck (not in my home and definitely not for the nasty crickets!) They tell the temperature. Killing a spider is bad luck. In addition to reducing local disease-carrying insects, spiders provide humans with other medical benefits. Spider venom is used in neurological research and may prevent permanent brain damage in stroke victims. The silk produced by spiders is used in many optical devices including laboratory instruments. Ivy growing on a house protects the inhabitants from witchcraft and evil. Evil may mistake it for poison ivy and stay away. Friday the 13th is unlucky The Templars were all arrested (and most were tortured and executed) one Friday the 13th! Actors believe that using real money as a prop is bad luck. This is probably rooted in the fact that leaving real money on stage or in your costume means that there is a good chance that the prop will disappear before the next performance. Opening an umbrella in the house is bad luck. Like walking under a ladder, this is just a hazard; you could hit someone or break something. Bad luck comes in threes. This is sometimes expressed in notable deaths occurring in threes. In fact, this is a well-known psychological bias known as "confirmation effect"; when two events occur, people naturally anticipate a third (two things don't form a pattern, but three do). When the expectation is satisfied, it "proves" the adage. Of course, if it is not, then the pattern is not recognized.
Asked in Science
Function of school in social science theories?
conflict- schools function to reproduce the dominant ideologies. for example, teaching the american dream (that individuals that work hard enough can succeed), when in reality, many people are set up for failure. but when they fail, they feel that it's their fault and don't question the system, because they have internalized the dominant ideology. functional (consensus) -schools funtion to place people into the labor market in positions that they are qualified for. so then, people who go to medical school were prepared for the rewards of this position because the school taught them the skills they need.
Asked in Science
In what type of organization is sequence extremely important?
Asked in Science
Will a box covered in aluminum foil or a box covered in black paper attract the sun more?
Is projectile motion a motion in one dimension the direction of gravity?
Asked in Science
Why do scientists use computer programs to model protein and function?
A normal protein can be composed of about 10000 amino-acid residues, that is something like 100000 atoms, but large proteins exist composed by more than 500000 atoms. All these atoms are not randomly distributed, but forms a complex and ordered structure, called the protein secondary and tertiary structure. Just to make the situation more complex, several proteins sometimes join together to form protein complexes, like the heart Troponin complex. As all biomolecules proteins react with other molecules in specific sites, called active sites for the considered reactant. Naturally different active sites exist, for different molecules with which the protein can react. The possibility of a protein to react with a certain molecule depends not only from the presence of a suitable active site that binds with the considered molecule, but also from the protein shape, the so called steric factor. For example, if the protein shape enclosed the active site withing a sort of shell, that renders impossible to the other molecule to reach it, the reaction cannot happen even in the presence of a suitable active site. last, but not least, reaction is possible frequently only in suitable environmental conditions like pH, reagents concentrations, presence of enzymatic catalysis and so on. Such a complexity is very difficult to manage without the help of a computer that allows the huge number of possible situations to be managed.