* Compare the views of Hubble and Friedman about the expansion of the universe: Edwin Hubble’s observation In 1929‚ Edwin Hubble announced that his observations of galaxies outside our own Milky Way showed that they were systematically moving away from us with a speed that was proportional to their distance from us. The more distant the galaxy‚ the faster it was receding from us. The universe was expanding after all‚ just as General Relativity originally predicted! Hubble observed that the light
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associated with elementary particles for example electron‚ proton and many more. Electric charge is the property responsible for electric forces which acts between nucleus and electron to bind the atom together. Charges are of two kinds (i) negative charge (ii) positive charge Electrons are negatively charged particles and protons‚ of which nucleus is made of‚ are positively charged particles. Actually nucleus is made of protons and neutrons but neutrons are uncharged particles. electric
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Models of the Atom: a Historical Perspective John Dalton Early Greek Theories • 400 B.C. - Democritus thought matter could not be divided indefinitely. • This led to the idea of atoms in a void. fire Democritus • 1800 -Dalton proposed a modern atomic model based on experimentation not on pure reason. All matter is made of atoms. Atoms of an element are identical. Each element has different atoms. Atoms of different elements combine in constant ratios to form compounds. • Atoms are rearranged
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The dissociation of protons from oxalic acid proceeds in a stepwise manner as for other polyprotic acids. Loss of a single proton results in the monovalent hydrogenoxalate anion HC2O4−. A salt with this anion is sometimes called an acid oxalate‚ monobasic oxalate‚ or hydrogen oxalate. The equilibrium constant (Ka) for loss of the first proton is 5.37×10−2 (pKa = 1.27). The loss of the second proton‚ which yields the oxalate ion has an equilibrium constant of 5.25×10−5 (pKa = 4.28). These values imply
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neutrino emission from the recent onset of the breaking and formation of neutron Cooper pairs in the 3 P2 channel. We find that the critical temperature for this superfluid transition is ’ 0:5 Â 109 K. The observed rapidity of the cooling implies that protons were already in a superconducting state with a larger critical temperature. This is the first direct evidence that superfluidity and superconductivity occur at supranuclear densities within neutron stars. Our prediction that this cooling will continue
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employed to identify an unknown amino acid. A titration curve is the plot of the pH versus the volume of titrant used. In the case of amino acids‚ the titrant will be both an acid and a base. The acid is a useful tool because it is able to add a proton to the amine group (see fig. 1). Likewise the base allows for
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Cited: “The Rocky Saga: Going the Distance”. Biography Channel. Bio‚ Oklahoma City. 27 Dec. 2011. Television. “Why Rambo Mattered”. Wardenski‚ Nathan. Sounds of Cinema. KQAL FM‚ Minnesota. 30 May 2010. Web. Transcript. "Sylvester Stallone Bio." Sylvester Stallone. N.p.‚
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one of which is The other product is ________. A. B. C. D. E. 2. The decay of to occurs through the emission of a(n) ________. A. alpha particle B. beta particle C. neutron D. proton E. positron 3. Radionuclides which have too low of a neutron/proton ratio generally decay through ________. A. beta emission B. electron capture or positron emission C. gamma ray emission D. alpha emission E. neutron absorption 4. How many neutrons does have? A.
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solutions contain OH⁻ (aq) ions. This OH⁻ (aq) ion is cancelled out by the H⁺ (aq) ion. e.g. H⁺ (aq) + OH⁻ (aq) = H₂O (l) The acid and alkali are neutralised to make water. An H⁺ ion is just a proton. Acid reacts by giving protons (H⁺) and so are proton donors Alkalis react by receiving protons and so are proton acceptors Using this science‚ I conducted an experiment on how a specific factor affects the pH changes during a titration. I added a specific amount‚ type‚ and concentration of acid to an
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the atom) Positively charges protons and neutrally charged (non-charged) neutrons are found in the nucleus Negatively charged electrons are located orbiting the nucleus in shells. They stay in orbit because the electrons are attracted to the protons 2: The Element Introduction An element is a singular type of atom‚ like candy in a candy shop If there is an atom that has 8 protons and 8 electrons‚ then it is an oxygen element. If it has 1 proton and 1 electron‚ then it is a hydrogen
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