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            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.

            Asked in Science, Chemistry, Periodic Table

            What is the fourth element of the periodic table of elements?

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            Beryllium (Be) See the Web Links and the Related Questions for more information.
            Asked by Ciara Parker in Sound Waves, Science

            Is silence a sound?

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            According to Merriam-Webster, the definition for silence is: "1: forbearance from speech or noise 2: absence of sound or noise"
            Asked in Science, Units of Measure, Weight and Mass, Atomic Mass

            What instrument measures mass?

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            A Beam balance (or Beam scale) is a device to measure weight or mass.
            Asked by Randal Bernhard in Science, Medical Technologies

            Given unlimited resources, what scientific or medical problem would you investigate?

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            Leukemia. when I was 3 I had leukemia, and now when I go to hospitals I see little kids with it and my heart melts 'cause they don't know what's happening to their life. ;-;
            Asked in Science, Scientists

            What is the scientific attitude and what attitudes and characteristics define a good scientist?

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            I believe you can refer to experts at MyAssignmentHelp to get the precised answer.
            Asked in Science, Atomic Mass

            What is gold's mass number?

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            The only stable, and only naturally-occurring isotope of gold has mass number of 197. This is the number of protons and neutrons in each nucleus. Gold's atomic number is 79. This is the number of protons found in each gold atom. This determines its place in the periodic table, and its chemical properties: it is the defining property of gold. A nucleus with a different number of neutrons and the same 79 protons would be a different isotope with a different mass number; a nucleus with a different number of protons would not be gold, but some other element.
            Asked in Science, Definitions, Nintendo DS, Nintendo Wii

            What are the 5 oceans of the world?

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            Arctic Ocean, Atlantic Ocean, Indian Ocean, Pacific Ocean, Southern Ocean
            Asked in Science, Earth Sciences

            What is the rock cycle song?

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            SEDIMENTARY rock Has been formed in layers Often found near water sources With fossils from decayers Then there's IGNEOUS rock Here since Earth was born Molten Lava, cooled and hardened That's how it is formed These two types of rocks Can also be transformed With pressure, heat and chemicals METAMORPHIC they'll become (sung to the tune of row row row your boat) (=**=) (<cat lol)
            Asked in Science, Chemistry, Acids and Bases

            What are some examples of chemical and physical changes?

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            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)
            Asked in Science

            Is the independent variable the thing you change?

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            Yes The independent variable is also known as the manipulated variable. In an experiment where you need to test different objects, the independent variable would be the different objects.
            Asked in History of Science, Science, Superstitions

            What superstitious beliefs have a scientific basis?

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            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 苹果彩票网登录 are good luck (not in my 苹果彩票网登录 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, Urinary System

            What are the tubes called that carry urine away from the kidneys to the urinary bladder?

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            As I believe has already been stated the Ureters, which are also the source of blockages from kidney stones. Not where they come from that is but where stones large enough usually 5 mm can cause blockages. 2 and 3 even 4 mm stones csn take up to 45 days to pass but usually do. The danger is if stones are present in both Ureters and are causing blockages then the urine can back up and seep into your abdomen and cause infection throughout, this is called sepsis and is life threatening which can kill you in a matter of hours. They usually implant a stint bypassing the Ureter to avoid such an incident, the good news is your body was designed with redundancies. You only need 1/3 of 1 kidney to sustain bodily function.
            Asked in Science, Earthquakes, Plate Tectonics

            What is the process that powers plate tectonics?

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            Convection, as heat from the mantle is transferred to the lower crust, which can move very slowly in response to the increased upward pressure. The heat makes the rock liquid (magma) in some areas, allowing it to flow upward to the surface, thus creating spongebob squarepants!
            Asked in Science, Cooking 苹果彩票平台

            Why is the pan handle made of plastic?

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            The first and last answers simply are not correct, nor do they answer your question. The second, middle question is much better, but it does not fully answer your question either. If a metal pan with a plastic handle is put in the oven at, let's say, 350 deg., then the temperature of the entire pan, metal and plastic, will eventually reach 350 deg. It is not true that the plastic won't get hot, actually it should heat up faster than the metal. There are two properties in consideration: heat capacity and thermal conductivity. Metals in general have large heat capacities. One can think about the amount of heat a substance can store per unit mass, called the "Specific Heat," or one can consider the amount of heat a substance can store per unit volume. In the case of a pan and handle, it makes more sense to look at the question in terms of the heat stored per volume. Most people know from everyday experience that metals stay hot longer than non-metals like wood and plastic. That is because metals have a much larger heat capacity per volume than most non-metals; that is they hold more heat. What about thermal conductivity? In this case, we only need to consider the thermal conductivity of air. Heat flows FROM a hotter object TO a cooler object. If a pan w/ plastic handle is put in a 350 deg. oven and allowed to heat up completely, when it is taken out the oven the pan and handle are at 350 deg. We only need to consider the heat transfer from the metal to the air and from the plastic to the air. Since the cooler material is the air, all that matters is the thermal conductivity of the air. You can look up thermal conductivities in a table, but air, and all gasses, have much lower thermal conductivities than almost any solid, and it is certainly lower than the pan and Bakelite® (the pan's handle). Since the handle does not contain as much heat as the pan, it will cool down to a touchable temperature faster. The same applies if the pan is placed on a burner. The handle will take longer to heat up than the metal because 1) the metal is directly over the flame, and 2) the metal has a higher thermal conductivity than the plastic meaning that a lot more of the heat from the burner will be absorbed by the metal. Answer The reason the pan Handle is made of plastic is because Plastic is not a conductor of heat so it won't get hot. If the handle was metal it would get very hot because it is a conductor of heat. Answer Frying pans have plastic handles because plastic is a terrible conductor of heat that is coming from a stove. Therefore the handle is cool even when the metal of the frying pan is hot, when you need to lift it, or perhaps something else. Answer Safety. Plastic will not conduct either heat or electricity, so in order you can safely handle pots and pans, plastic is used for those reasons. Conductivity of air plays practically no role in this. If the pan heats up air in contact, that air is immediately removed by convection and replaced by cool air.
            Asked in Science, Chemistry

            10 examples of physical change and chemical change?

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            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
            Asked in Science, Growth Rates, Carbonated Beverages, Coca-Cola

            Does Coke stop your growth?

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            Too much sugar instead of vital nutrients certainly can. Thus, limited amounts are best for the human body, depending upon caloric intake, body mass, and exercise.
            Asked in Science, Ingredient Substitutions, Baking Soda (sodium bicarbonate)

            What is an alternative to bicarbonate soda?

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            Depends on what reciepe you are using and what the purpose is: I often use yeast but in some recipes depending on the fluffiness of the cake I will sometimes use baking soda. A friend of mine uses "fizzy water" (carbonated water) as an alternative. Yeast is only used in bread related recipes, whereas bicarb can be used n cakes ~ Baking Soda in a recipe is to help with 'spreadability of the cookie or cake. You don't use it in pancakes so you want the batter to 'stay put'. In a cookie, you want it to spread out a bit, in the cake, you want it to fill in the space of the pan. Baking Soda and Baking Powder CAN be used for each other in a subbing situation. They are both considered leavening agents. In choosing to substitute one for the other you have to know the ratio AND the fact the flavor WILL be DIFFERENT. 1 TSP of Baking Soda needs 3 TSP of Baking Powder. OMIT all SALT. Reverse it to use soda instead of baking powder. You can also use 2 tsp soda and 1 tsp cream of tarter to create BAKING POWDER. Again, omit the salt from the recipe. AGAIN, any substitutions of ingredients, expect flavor change to happen.
            Asked in Science

            What is the thinnest of the earths spheres?

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            The Earth can be divided into four main layers: the solid crust on the outside, the mantle, the outer core and the inner core. Out of them, the crust is the thinnest layer of the Earth, amounting for less than 1% of our planet's volume
            Asked in Science, Physics, Chemistry, Chemical Bonding

            Why does water have a high and specific heat capacity?

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            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 solids. Third, heat capacity is the ability of matter to absorb thermal energy. One calorie is defined as the amount required to heat a gram of water one degree Centigrade. That same calorie will heat a gram of gold 33 degrees. Water's specific heat is defined as 1. The specific heat of gold is therefore .03. Water has a high specific heat because there are quite a few ways water can store heat. 1. Moving along three axes 2. Rotating the "V" shaped molecule in three different directions 3. Hydrogen atoms vibrating back and forth like a tuning fork 4. Hydrogen atoms vibrating up and down along their H-O axis. Finally, the heat of fusion of water is 80 calories per gram, and the heat of vaporization for water is 540 calories. So ice can absorb 80 times as much heat while melting as the same mass of water. Water absorbs 540 times as much heat while turning into water vapor as the same mass of water absorbs. Both phase changes occur at constant temperature, 0 Centigrade and 100 Centigrade respectively. Look up phase change graph for water to see the interesting line.
            Asked in Science, Biology, Genetics, Biotechnology

            What is the GC content of a human genome?

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            40% This also lets us know that the AT ratio is 60%
            Asked in Science, Biochemistry, Reference Books

            Could somebody suggest some good books on biochemistry to read to put on personal statement?

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            Lehninger's principles of Biochemistry.. Voet and Voet, Biochemistry Elliot and Elliot, Biochemistry and Molecular Biology
            Asked in Science, Periodic Table

            What are some materials or things that change from solid to gas?

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            Sublimation is where a solid turns into a gas directly without a liquid stage. Many solids are able to do this under the right temperature and pressure conditions. Common examples are mercuric chloride, iodine, and carbon dioxide.

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