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The following document is a teaching resource available at www.MorrowGalpern.ca © Paul Galpern, 2003 [email protected] Saved in Microsoft Word 2000 format. BEWARE! If you do not have this software or a later version on your computer, many of the layout features (tables and graphics) will not appear as intended. Like all teaching resources it is a work in progress. Permission is granted to use, alter and reproduce this resource for your own classroom. For publication, please contact the author for permission. Iād love to hear what you think about this resource. Please drop me a line through my website: www.morrowgalpern.ca/contact/index.htm Science, Gr. 9 Atoms & Elements Unit Unit 3 Test A. Word Matching (1 point each) ___ melting a) a gas that is frozen to make dry ice ___ solution b) a change in state from gas to solid, or from solid to gas ___ viscosity c) the metric unit of volume for liquids ___ sublimating d) the metric unit of mass ___ metre e) a physical property that describes how a liquid flows ___ condensing f) a change in state from gas to liquid ___ malleability g) the ability of a substance to be formed into shapes ___ compound h) the metric unit of length ___ gram i) contains the protons and the neutrons in an atom ___ electron j) contains more than one element ___ atomic number k) a change in state from solid to liquid ___ nucleus l) a form of an element with a different number of neutrons ___ mechanical mixture m) pop (Sprite, Coke) is an example ___ litre n) fruit loops and sand are an example ___ isotope o) carries a negative charge; not in the nucleus ___ carbon dioxide p) the same as the number of protons in an atom B. True and False (1 point each) ___ Combustibility is the ability of a substance to react with acids ___ Sugar disappearing in water is an example of a solution ___ Raisins in Raisin Bran are an example of a solution ___ Lighting a test tube of acetylene gas is an example of a reaction with acid ___ Lighting a test tube of acetylene gas is a physical change ___ Tearing a piece of paper is a physical change ___ Burning a piece of paper is a chemical change Use the periodic table for these ones: ___ A hydrogen atom has more protons than a helium atom ___ Nitrogen has 8 protons ___ There are 238 protons in Uranium C. Draw (3 points each) a) a Chlorine atom with no charge, and 18 neutrons (use the Bohr-Rutherford model and electron shells) b) a sugar cube dissolving in water (using the particle theory) c) a Magnesium atom with no charge, and an atomic weight of 24 (use the Bohr-Rutherford model and electron shells) D. Problem Solving 1. Do the following metric conversions: (1 point each) M k h megakilohecto- NO PREFIX c m 1 000 000 1 000 100 106 103 102 1 101 centimilli- 1 100 1 1 000 10-2 10-3 1.5 kJ = ____________ J 750 mL = ____________ cL 20 300 cm = ____________ km 201 MB = ____________ kB 2. Find the exact atomic weight of the following isotopes. Show your calculations. (2 points each) (A proton weighs 1.0073 u, and a neutron weighs 1.0087 u) a) an element with 6 protons, and 7 neutrons b) An oxygen atom with one more neutron than protons 3. Find the number of atoms in the following compounds: (1 point each) a) NaHClO3 has ____oxygen atoms b) CO2 has ____ oxygen atoms c) CuSO4 ā 5H2O has ____ hydrogen atoms d) Fe(NO3)2 has ____ nitrogen atoms 4. Solve the following density problems. Always show your work. (2 points each) d=M V V=d M M=dxV a) A 1L jar of honey weighs 454 g. What is its density? b) A container of ethanol has a density of 0.789 g/mL. What is the mass of a 2 mL container? c) What is the volume of a container of water that contains 40 kg of water. Water has a density of 1 g/mL. (DO THE METRIC CONVERSION FIRST!) E. Written Answers 1. Name the element you studied, saying ONE thing it can be used for, and why it is useful for that. (K ā 2 points, M ā 2 points) 2. Why does a diet pop float, and a regular pop sink? Explain your answer well.