of all the atoms present in one molecule of that compound. Example: the molecular mass of sodium bromide‚ NaBr‚ is 103‚ which represents the sum of the atomic mass of sodium (23) plus that of bromide (80). * Calculating the Molecular Mass (Formula Mass) of a Compound * To find the molecular mass of a compound‚ add the atomic masses of all the atoms that are present in that compound. * In the compound H2O‚ the molecular mass can be calculated by adding the mass of two atoms of hydrogen
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12.6 mL – 2.03 mL = 10.6 mL b) 10.0 g / 2.4 mL = 4.2 g/mL c) 125 Aspirin tablets X 1.3 g / tablet = 162.5 g = 160 g 6. Complete the following table. Particle | Mass of subatomic particle (g) | Charge of subatomic particle | Location in atom | proton | 1.67 x 10^-24 | positive | nucleus | electron | 9.11 x 10^-28 | negative | outside the nucleus | neutron | 1.67 x 10^-24 | neutral | nucleus | 7. Complete the following table by filling in the boxes with the appropriate information
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are solutions a) air b) titanium c) oak d) baking soda e) oxygen f) 7-Up g) wine h) carbon monoxide 3. Label each of the following drawings as element‚ compound‚ or mixture (Assume each type of circle represents a different type of atom.) a) b) c) d) ____________ ____________ ____________ ____________ Which of the boxes above contain molecules 4. List four physical states of matter. For each physical state‚ indicate whether the particles are in
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formed by the joining of two or more atoms. A stable compound occurs when the total energy of the combination has lower energy than the separated atoms. The bound state implies a net attractive force between the atoms ... a chemical bond. The two extreme cases of chemical bonds are: Covalent bond: bond in which one or more pairs of electrons are shared by two atoms. Ionic bond: bond in which one or more electrons from one atom are removed and attached to another atom‚ resulting in positive and negative
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found in a different form than just one unbonded atom. In the case of hydrogen‚ nitrogen‚ oxygen‚ fluorine‚ chlorine‚ bromine‚ and iodine‚ the element is diatomic‚ meaning that each molecule of the element has two atoms of that element stuck together. As a result‚ the formula of hydrogen is H2‚ nitrogen is N2‚ etc.This gets weirder for a couple of cases... phosphorus is normally found in clumps of four atoms‚ P4‚ and sulfur is found in clumps of eight atoms‚ or S8.Still‚ aside from the exceptions above
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flows in an aqueous solution of ionic compounds‚ the metal ions appears at the negative electrode (cathode). - The metal exists in the solution as positively charged particles known as ions. - A 1+ ion plus one unit of electricity gives one metal atom. - Low pressures gases conduct electricity very well. - The glass of containing vessel opposite the cathode (negatives electrode) glowed when the applied potential difference (voltage) was sufficiently high. - Solid objects cast shadows between
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assignment especially in questions 2 ai) 2ci) & 3bi). Question 2 a) i & ii) b) i) The chemical formula of the compound containing only K+ and SO42- is K2SO4. ii) The formula of the simplest possible compound containing only C and I atoms is CI4. iii) K2SO4 was formed by ionic bonding and has overall regular/repeated crystal structure‚ it has a melting point of over 1000oc‚ ionic compounds like K2SO4 are also often soluble in water. CI4‚ in contrast‚ was formed by covalent bonding
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struture The basic building block of all matter is called an atom. Atoms are a collection of various subatomic particles containing negatively charged electrons‚ positively charged protons and neutral particles called neutrons. Each element has its own unique number of protons‚ neutrons and electrons. Both protons and neutrons have mass‚ whereas the mass of electrons is negligible. Protons and neutrons exist at the centre of the atom in the nucleus. Electrons move around the nucleus‚ and are arranged
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Democritus was an Ancient Greek pre-Socratic philosopher of Ancient Greece. He along with Leucippus were atomic theorists who proposed during the fifth century B.C that 1. Matter is composed of atoms separated by empty space by which atoms move. 2.Atoms are solid‚ homogeneous‚ indivisible‚ and unchanging. Democritus knew that if he took a rock and chisel it in half‚ that both halves would characteristically have the same properties as the whole. He rationalized that if he was to continue to cut the
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Atoms and the Periodic Table Chapter 2 Atoms and the Periodic Table / Elements and the Periodic Table * An element is a pure substance that cannot be broken down into simpler substances by a chemical reaction. * Each element is identified by a one- or two-letter symbol. * Elements are arranged in the periodic table. * The position of an element in the periodic table tells us much about its chemical properties. Atoms and the Periodic Table / Elements and the Periodic
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