what material is sound classified as an element, a compound, a homogeneous mixture or a heterogeneous mixture?
78979
None, sound is a wave not a particle. Sound is just a wave of vibrations travelling through atoms.
621519
I think you're lacking the basic concept of how materials exist chemically (in what state). Elements can combine to form compounds that have completely different properties from the original elements. Or elements can exist as themselves (which is very rare). Now, most of the time when us humans invent some chemical, from fertilizers to drugs, they are a mixture of compounds. A mixture is anything 'mixed' together, bot 'combined'. So, your fertilizer will have many elements in compound forms. If there are any life forms, such as bacteria in organic fertilizer, these are highly organized forms of thousands of chemical compounds,  integrated to perform certain functions.
449706
Sound travels faster through denser materials.  The closer the molecules of the material are, the easier it is for them to pass the sound energy between them.\n\nSolids are the densest of the three, then liquids, then gases.
85345
Alloy.  The answer is alloy.  \nAn alloy is basically any homogeneous (same throughout) mixture of metals such as bronze, brass, and stainless steel.  Note that "homogeneous (same throughout) mixture" is the exact definition of a solution.
477871
Element:\n\nA substance composed of atoms having an identical number of protons in each nucleus. Elements cannot be reduced to simpler substances by normal chemical means.
482518
Modern materials science tends to classify materials into the following categories:\n\n1. Metals (this includes pure metals and alloys)\n2. Ceramics\n3. Polymers\n\n4 (sort of). composites\n\ncomposites are generally not considered to be an actual material type because a composite is simply a combination of 2 or more different material types, for example a metal matrix ceramic material would be a composite.
141886
Chemists classify matter into substance and mixture. A substance may be an element or a compound whereas a mixture is physical mixing of two or more substances. In case of orange juice it is amixture of many substances (compounds) mostly dissolved in water, being the most abundent substance in the juice, and some tiny particles, referred as suspensions (collidial solution). Thus a chemist will not accept the phrase that a pure juce is a pure substance. It is a mixture.\nAs one friend answered, it is better to call fresh juice than to say a pure juice.\nThis concept applies to all most all juices from fruits and vegitables.
181822
Sound travels in a wave.  Actually travels best through a solid.
735706
I would think your teacher is asking you about the way elements are grouped in the periodic table. You'll notice, for example, that gases are grouped together.\n\n Do a google on "classification of elements" -- there is a lot of stuff out there, and I'm sure it's also in your science text.
152675
The word "solution" is synomynous with the phrase "homogeneous mixture," which means that it is uniform throughout.  When we say that coffee is a solution, we are saying that it is uniform throughout, which, for practical purposes, it is.
62079
Yes, diamond, graphite, and its relatives are all inorganic. A more specific definition of an organic compound is something that contains both carbon and hydrogen atoms.
364559
I'm going to assume that you are asking which of the two materials you listed are best at absorbing sound vibrations.  There are many methods, the two you listed are valid, albeit a bit primitive, but the link that I have included below may help you much more.  (Cork soundproofing can be quite expensive, btw.)
953035
a) pseudo solid. An example would be when you mix a lot of corn starch to water, creating a matrix. When you stir it quickly, it cracks and breaks, but when you stir it slowly, it behaves as a liquid. So this pseudo solid has some solid properties, but really is a colloid liquid.\nb) Annealing. (metallurgy), a heat treatment that alters the microstructure of a material causing changes in properties such as strength and hardness. This process is done for steel and other alloys in machining high quality parts for aeronautics, tooling, etc.
889059
A mixture is things mixed together but not completely so you can tell them apart. Eg: Sand and Flour. A solution is something that once you mix it together, you can no longer tell the two things apart. Eg: Salt and Water. I would have to say that the cake would be a solution after it is baked because you can no longer tell the different ingredients apart. (If it was made correctly.)
809778
When sound (or other waveform of similar shape, like an AC signal) travels through a medium, its intensity diminishes with distance. In idealized materials, signal amplitude is only reduced by the spreading of the wave. Natural materials, however, all produce an effect which further weakens the sound. This further weakening results from scattering and absorption. Scattering is the reflection of the sound in directions other than its original direction of propagation.  Absorption is the conversion of the sound energy to other forms of energy.  The combined effect of scattering and absorption is called attenuation.  Ultrasonic attenuation is the decay rate of the wave as it propagates through material.\n\nAttenuation of sound within a material itself is often not of intrinsic interest. However, natural properties and loading conditions can be related to attenuation. Attenuation often serves as a measurement tool that leads to the formation of theories to explain physical or chemical phenomenon that decreases the ultrasonic intensity. \n\nThe amplitude change of a decaying plane wave can be expressed as:\n\n A = A0*e^(-kz)\n\nIn this expression "A0" is the amplitude of the propagating wave at some location. The amplitude "A" is the reduced amplitude after the wave has traveled a distance "z" from that initial location. The quantity "k" is the attenuation coefficient of the wave traveling in the z-direction. The dimensions of are nepers/length, where a neper is a dimensionless quantity. The term "e" is Napier's constant which is equal to approximately 2.71828. \n\nAttenuation is generally proportional to the square of frequency. Quoted values of attenuation are often given for a single frequency, or an attenuation value averaged over many frequencies may be given. Also, the actual value of the attenuation coefficient for a given material is highly dependent on the way in which the material was manufactured. Thus, quoted values of attenuation only give a rough indication of the attenuation and should not be automatically trusted. Generally, a reliable value of attenuation can only be obtained by determining the attenuation experimentally for the particular material being used.\n\nThis is why higher-frequency signals tend to produce what is called "skin effect" ... basically, the energy isn't there for the wave to penetrate to any significant depth.
1128070
Music is organized sound, so I think the answer would be "irregular vibration patterns".  These links should help.
160215
The speed of sound is defined (thermodynamically) as:\nc^2= dp/d(rho), \nwhere c is the speed of sound, p is pressure, and rho is density.\n\nFor a solid material, c^2=E/rho, where E is Youngs modulus.  So material with a low density and high modulus would have the fastest speed of sound.  Carbon nanotubes come to mind as filling those requirements.