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Mr. Bellerillo: Chem
Mr. Bellerillo Chemistry Unit Test
| Question | Answer |
|---|---|
| The simplest pure chemical substance. Hint there are 92 naturally occuring: | Element |
| Two or more elements CHEMICALLY combined are know as: | Compound |
| An atom with an electrical charge is know as: | ion |
| This is equal to the number of protons and neutrons in the nucleus: | Atomic Mass |
| H2SO4 is an example of a: | Chemical Formula |
| Chemical description of a reaction using symbols and formulas. | Chemical Equation |
| The process whereby a new and different substance is formed: | Chemical Reaction |
| The particles of an atom that have a negative charge are known as? | Electrons |
| These are the location of the electrons within the electron cloud. | Energy Levels |
| If the mass of the reactants are 15g, then the product will also be 15g. This is an example of what? | Law of Conservation of Mass |
| The number of protons in an atom. | Atomic Number |
| The folowing are examples of what? O2, N2, Cl2, H2, | Diatomic Atoms |
| A chemical formula is a shorthand way of showing a? | Compound/Molecule |
| The third energy level fills with _______ or ______ electrons | 8 or 18 |
| An ion becomes positive by ____________ an electron | Losing |
| List each element and the number of atoms per element in the following molecule: C3H5(OH)3 | Carbon-3, Hydrogen-8, Oxygen-3 |
| Using the Periodic Table, answer the following questions. Element: Au 1. Name of the element. 2. Atomic # 3. Atomic Mass 4. Electrons 5. Protons 6. Neutrons | 1. Gold 2. 79 3. 196 4. 79 5. 79 6. 118 |
| The element Au has how many more neutrons than protons? | 39 |
| Draw the following atom, Phosphorus | |
| This is an ordered listing of elements by their atomic # | Periodic Table |
| This is the smallest particle of a compound? | Molecule |
| Electrons in the outer most energy level are known as? | Valence Electrons |
| The resultant substance created in a chemical reaction is called? | Product |
| This number indicates the number of atoms, of each element, in a chemical formula. | Subscripts |
| Molecules that behave as atoms in a chemical reaction. | Polyatomic ions |
| These are found in the nucleus of an atom and have no charge? | Neutron |
| Number of electrons gained or lost during chemical bonding is known as: | Oxidation # |
| Positively charged subatomic particles are known as: | Protons |
| The chemicals present before a reactions takes place. | Reactant |
| List the polyatomic ions, oxidation numbers and write the chemical formula for the following, 1. Aluminum Chloride 2. Iron Sulfide | 1. AlCl3 2. Fe2S3 |
| Balance the following equation:Pb + H3PO4 --------> Pb3(PO4)2 + H2 | 3Pb + 2H3PO4 --------> Pb3(PO4)2 + 3H2 |
| Explain the difference between subscript numbers and coefficent numbers in relationship to a chemical equation | Subscripts are written below and after the symbol which represent the number of atoms per each element in the formula. Coefficients are the large number that comes before the substance which are used to balance an equation |
Created by:
jbellerillo
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