of titrant added at this point was determined to be 31.43 ml. This means 3.25 x 10-3 moles of NaOH were needed to react with 3.0 x 10-3 moles of HCl. Because HCl is a strong acid and NaOH is a strong base‚ the Ka is very high. Essentially all the protons in equilibrium come from the acid‚ and not from water. This means before the equivalence point‚ pH is determined almost exclusively by the strong acid‚ and after the equivalence point it is determined by the strong base. At the equivalence point‚
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passengers boarding a bus) with the Electron Configuration Gizmo™. To begin‚ check that Lithium is selected on the PERIODIC TABLE tab. 1. The atomic number is equal to the number of protons in an atom. How many protons are in a lithium atom? ________3_____ 2. A neutral atom has the same number of electrons and protons. How many electrons are in a neutral lithium atom? ______3_______ 3. Select the ELECTRON CONFIGURATION tab. Click twice in the 1s box at upper left and once in the 2s box. Observe
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elements"? Because hydrogen has an atomic number of only “1” which means it only has one proton in its nucleus and it is the only element with only one proton in its nucleus also has one electron 2. What must happen in order for an atom to lose its electrical neutrality? In order for an atom to lose its electrical neutrality the protons and electrons would have to have an unequal number of positively charged protons versus negatively charged electrons must either gain or lose an electron 3.
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consists of a nucleus‚ which is made up of protons and neutrons. · Protons are positively charged particles. Neutrons have no charge. There is an outer layer made up of negatively charged electrons‚ which keep orbiting the nucleus in a random manner. · The number of protons and electrons are always equal in an atom. Because of this‚ the atom has got a neutral charge. · The protons and electrons weigh more or less equal and the total number of protons and neutrons put together make the atomic weight
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ELECTRONICS 1A (PHS 206) COURSE CONTENT: 1.ELECTRONS IN MATTER 2.ELECTRON EMISSION INTRODUCTION The Word Electronics derived its name from electrons in all materials. It is a branch of Science‚ Technology and Engineering that deals with current conduction through vacuum‚ gas‚ solidsmatter in general. It deals with electronic device and their utilization. INTRODUCTION contd Electronic device is that in which current flows through a matter. Such devices have valuable properties which enables
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DNA. These are all properties that all living things share. 2. What happens if an atom of an element gains or loses electrons? What happens if an atom of an element gains or loses neutrons? What happens if an atom of an element gains or loses protons? Atoms in which the number of
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Dynamic Chemistry Matter – Any substance that has volume & mass. E.g. EVERY THING Atom – The smallest non living thing that can exist. Atomic Structure – Particle | Symbol | Location | Charge | Mass | Proton | P | Nucleus | +1 | 1Heavy | Neutron | N | Nucleus | 0 | 1Heavy | Electron | E | Electron Shell or Orbit | -1 | 12000Light | History of the Atom – The model of the atom has changed with time. Dalton – solid shape (no subatomic particles) (indivisible particle) Rutherford
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Since isotopes have the same number of protons‚ they all have identical chemical behavior. But‚ however‚ since their neutron numbers are different the isotopes of the same element may have different radioactivity. An isotope that is radioactive is called a radioisotope like iodine‚ which is important in our health. In radioactivity‚ the nucleus of an unstable isotope or element breaks down by itself and gives off rays and particles; the ratio of neutrons to protons for stable isotopes increases for heavier
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mind* ü Metals have a high low ionization energy ü Non-metals have a high electron affinity · Atom: The basic unity of an element which still retains the elements properties · Atomic number: the unique number of protons in the nucleus of a particular element · Isotope: Atoms of the same element which contain a different number of neutrons · Periodic law: The chemical and physical properties of the elements repeat in a regular‚ periodic pattern
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charge Q‚ are hung on strings 35 cm long and suspended from one point. They form a 40 angle between them. What is charge Q? Ans: 0.107 C 5. A proton is placed in a uniform electric field. What must be the magnitude and direction of this field if the electrostatic force acting on the proton just balances its weight? The mass of a proton is 1.67 x 10-27 kg Ans: 1.02 x 10-7 N/C‚ up. 6. Find the resultant electric field strength at point P as shown below. Ans: 7.20 x 106 N/C‚ 56
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