Are Chemical mass different  than Energy?
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Why would you think either a black hole or Earth would be made up of "pure energy" just because they have mass?\nMass is mass, energy is energy, only in very specfic circumstances does the line blur (E=mc^2).
650528
Many forms of energy exist around us. Energy cannot be created or destroyed, only changed from one form to another. If a person ever says that energy is lost, what really happens is that energy is spent or changed into different forms. It never really is lost. For example, if you use water energy to create mechanical energy, you might "lose" some energy by creating heat energy in the form of friction.
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Interesting scenario first of all i would like to comment. Well actually the bond is due to electronic forces. Hence mass has litle effect on the bond strength. Thus i thikn the effect of mass change should be a small one!! unless you change the charge of proton too!!
57152
Relativistic mass is kind of an old concept.  In relativity, energy has inertia associated with it.  An object that is moving has more energy than an object at rest, thus it has more "mass" when it is moving than it does when it is sitting still.  A lot of the old scientists used to differentiate between rest mass and relativistic mass.  The relativistic mass was the extra inertia that the object had due to its motion.  Nobody really thinks about it this way anymore.  Einstein advocated only introducing the concept of rest mass.  This is because the rest mass is the same no matter what your reference frame is, but two observers in different frames won't always agree on the relativistic mass.  When you have a chunk of gold moving at close to the speed of light relative to you, you don't have more gold than you did when you were at rest.  The gold atoms just appear heavier because of their kinetic energy.   Likewise you aren't creating more protons, the protons that you have just look heavier.
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The definations wanted by you are given below-\n\nIn physics, matter is commonly defined as the substance of which physical objects are composed, not counting the contribution of various energy or force-fields, which are not usually considered to be matter per se (though they may contribute to the mass of objects). Matter constitutes much of the observable universe, although again, light is not ordinarily considered matter. Unfortunately, for scientific purposes, "matter" is somewhat loosely defined.\n\nMass is a property of a physical object that quantifies the amount of matter and energy it is equivalent to. Mass is a central concept of classical mechanics and related subjects, and there are several forms of mass within the framework of relativistic kinematics (see mass in special relativity and mass in General Relativity). In the theory of relativity, the quantity invariant mass, which in concept is close to the classical idea of mass, does not vary between single observers in different reference frames.\n\nAn elementary particle is a particle with no measurable internal structure, that is, it is not a composite of other particles. They are the fundamental objects of quantum field theory. Elementary particles can be classified according to their spin, with fermions having half-integer spin and bosons integer spin.\n\nSpace has been an interest for philosophers and scientists for much of human history. The term is used somewhat differently in different fields of study, hence it is difficult to provide an uncontroversial and clear definition outside of specific defined contexts. Disagreement also exists on whether space itself can be measured or is part of the measuring system. (See Space in philosophy.) Many fields use an operational definition in which the units of measurement are defined, but not space itself.\n\nIn chemistry and physics, an atom (Greek  átomos meaning "indivisible") is the smallest particle of a chemical element that retains its chemical properties. \n\nA chemical element, often called simply an element, is a substance that cannot be decomposed or transformed into other chemical substances by ordinary chemical processes. All matter consists of these elements and as of 2006, 117 unique elements have been discovered or artificially created. The smallest particle of such an element is an atom, which consists of electrons centered about a nucleus of protons and neutrons.\n\nIn chemistry, a molecule is an aggregate of two or more atoms in a definite arrangement held together by chemical bonds. Chemical substances are not infinitely divisible into smaller fractions of the same substance: a molecule is generally considered the smallest particle of a pure substance that still retains its composition and chemical properties. Certain pure substances (e.g., metals, molten salts, crystals, etc.) are best understood as being composed of networks or aggregates of atoms or ions instead of molecular units.\n\nIn particle physics, antimatter extends the concept of the antiparticle to matter, wherein if a particle and its antiparticle come into contact with each other, the two annihilate —that is, they may both be converted into other particles with equal energy in accordance with Einstein's equation E = mc2. This gives rise to high-energy photons (gamma rays) or other particle–antiparticle pairs-.
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Potential energy is the sum total of all the energy that CAN BE derived.  Think of it as stored energy waiting to be released.\n\nKinetic energy is the total energy being derived at some instant in time. Unlike potential energy, kinetic energy is determined by mass AND velocity.
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-Chemical reaction rates vary with conditions of the change, but nuclear rates do not.\nthis statement is true
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Your second statement is correct, i.e proton mass+electron mass = constant mass and energy.\nok, This is with reference with another question you asked about mass defect(and chose my answer as the best, thanks). The sum of individual masses is greater than the actual mass of the atom. I am sure of this because this is what explains the stability of an atom(less energy, more stable).\nI'll give you an example which I took from my chem book\n\nMe = 0.0005486 amu(atomic mass unit)\nMp = 1.007277 amu\nMn = 1.008665 amu\nMe,Mp,Mn are masses of electron, proton and neutron respectively and 1 amu = 1.6605 x 10^-27 Kg\n\nOne He atom contains two electrons, two protons and two neutrons.\nSumming up the values of the constituents you get 4.032981amu as the expected mass of the atom.\nHowever the actual mass of the atom is 4.002603amu\nDifference = 0.030378 amu\n\nThe formula to find the binding evergy(energy required to bring the constituents together) is: mass defect x 931.48MeV\n\nHere that would be 0.030378 x 931.48 = 28.296 MeV\ni.e that is the equivalent of the mass defect in energy.\nThe '931.48' part is calculated using Einstein's formula E=mc^2.
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The guy who answered before was right but i wanna explain it. An exothermice reaction is one in which heat energy is lost to the surroundings, thus at the end of the reaction, some heat would have been lost. For heat to have been lost, the product has to have lesser heat than the reactant.Take not that heat here is the same as Enthalphy.\nSince the Enthalphy heat value = heat of product-heat of reation = a negative number because heat of product is lesser.\nthus the answer is i nd ii\n\n2. To calculate the heat absorbed or evolved in a system, the formulais Q(quantity of heat) = m*c*T, where m is the mass, c is the specific heat capacity, and T is the change in temperature, thuis this three are neede. Density is not important in this calculation\nso the answwers are i and iii
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d)  both a and c\n\nbecasue in a chemical reaction   everythin on the product and teh reactant must be the same\n\nthe mass and atoms must be same
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Well energy is related to mass by the formula E=m*c^2 - so mass and energy are interchangeable. Photons do not have mass, but they still have energy. The energy of the photon is given by E=h*f (h is Plank's constant, f is frequency). So the higher frequency the light is, the more energy it has - gamma rays have more energy than radio waves etc. Because photons travel at the speed of light there is a problem. Special relativity tells us that anything with mass cannot go at the speed of light. But yes, usually things with energy need to have mass. Photons are simply different, they do not have mass but they still have energy which is proportional to their frequency.
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Law of Conservation of Mass.  The process of melting does not add or remove mass, and you're not creating or destroying any, so it should weigh the same before and after.
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Element talks about the chemical identity.  How one atom is not like another.\nAtom talks about the particular entities.\n\nElement is a general term while atom is a specific term.\nSo you can speack of the element so and so and be describing the substance and its properties for example as that element is in all the universe.
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it's the same. Mass of an object has nothing to do with its temperature. The definition of mass is the amount of matter in an object. What you are measuring with a balance is the weight of an object, which is also independent of temperature, and is the force of the gravity acting on the object. \nLook up the definitions of mass and weight on wikipedia.
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Any mass of gas has temperature T. That means that the gas molecules have average kinetic energy of E=E1=m1*v1^2/2=E2=m2*v^2/2 no matter what molecules are present in compound.\nThus E1/E2=1=(m1*v1^2)/(m2*v2^2) or v1/v2=sqrt(m2/m1)=sqrt(13/12)=1.04; hence the ‘lighter’ would move 4% faster than ‘heavier’.\nTo be more particular you have to consider rotation of molecules and their thermal capacities, but these effects are not substantial in our case.
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There are fundamentally many ways to answer this question; and I will address three.\n\nIn nuclear chemistry, there are four fundamental interactions of matter that can be termed energy:\n\n1. Strong interaction, or strong force. This is the force which holds together quarks and other subnuclear particles into discreet protons, neutrons, and electrons. This is the energy that is released in a nuclear reaction.\n\n2. Weak interaction, or weak force. This is the force which holds protons and neutrons together in the nucleus of an atom. This is the energy that is released in radioactive decay.\n\n3. Electromagnetism. This is the attractive or repulsive force caused by the positive or negative charge of atomic particles and the electromagnetic field of photons. This force is the most wide in function, and is present in practically every conventional phenomenon. The electromagnetic force is responsible for electron orbitals, for chemical bonds and reactions, for electromagnetic radiation, and fundamentally for traditional force.\n\n4. Gravity. This is the tendency of objects with mass to accelerate toward each other. This is the weakest force, but can act over an almost unlimited distance.\n\nOR ....\n\nIn classic chemistry, a molecule can have three kinds of energy:\n\n1. Transitional energy, or the energy relative to motion.\n\n2. Chemical energy, or the energy inherent to electrochemical bonds.\n\n3. Vibrational energy, or energy relative to the vibration or oscillation of individual molecules.\n\nOR ...\n\nIn physics, we categorize all energy in the universe into two sets:\n\n1. Potential energy. This is the energy inherent in position or interaction with another body.\n\n2. Kinetic energy. This is the energy a mass possesses relative to its motion, whether it be classic velocity or vibration. This is sometimes termed work, though this is technically incorrect; both kinetic and potential energy are work, in different forms.\n\nAnd there you have it.
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a.)\n\nIn a liquid or a gas, not all molecules have the same kinetic energy.  Temperature is just a measure of the average kinetic energy.  There is statistical range of kinetic energies.  Those molecules that have the higher kinetic energy may escape from the liquid into the gas phase.