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7th Chemistry Unit Test Study Guide Test Date: Friday, Nov. 16, 2016 NaCl and MgO are both examples of which type of bond? How do you know? The diagram represents which type of atomic model? __________________________________. H20, CH4, and CO2 are all examples of which type Definition: of bond? How do you know? List the characteristics List the characteristics of a covalent bond. of an ionic bond. Choose any element and draw your own: The diagram represents which type of atomic model? __________________________________. Rusting statue, burning a match & mixing red bull Definition: & milk and baking pizza dough are all examples of? ________________________ Melting snow and making a paper snowflake are both examples of? _______________________ Choose any element and draw your 40. List 5 examples of 41. List 5 examples of own: a chemical change. a physical change. 1. 1. 2. 2. 3. 3. 4. 4. 5. 5. What is the difference between the two atomic models in the questions above? What is a precipitate? What is an exothermic reaction? What is an endothermic reaction? dioxide (CO2). Which chemical equation correctly describes this reaction? How should the following equation be classified? _______________________________. Na2SO4 + CaCl2 --> NaCl + CaSO4 Justify your answer: A. H2O + CO2 B. CaCO3 CaCO3 CaO + CO2 C. CaO + CO D. HCl + H2 CaCO3 ZnCl2 Is the formation of rust a synthesis or How should the following equation be classified? _______________________________. CaCO3 --->CaO + CO2 decomposition reaction? Explain. If Fe2O3 is the product, which of the following chemical equations shows the reaction? Justify your answer: a. 4Fe + 3O2Fe2O3 b. 4Fe + CO2 Fe2O3 How should the following equation be classified? c. 4Fe + 2H2O2Fe2O3 _______________________________. Fe + H2O --> Fe3O4 + H2 Justify your answer: Explain. When investigating changes to a war memorial statue, Tom the Turkey saw the statue had rusted. The product of the reaction was Fe2O3. Is the How should the following equation be classified? _______________________________. Na + Cl ---> NaCl formation of rust a physical or chemical change? Why? What does the Law of Conservation of Mass state? Justify your answer: In the following equation, which substances How should the following equation be classified? _______________________________. CaCO3 ---> CaO + CO2 are the products?_____________ CaCO3 ---> CaO + CO2 Define products: Justify your answer: In the following equation, which substances The Pilgrims were researching chemical reactions. They read that if you heat a small amount of calcium carbonate (CaCO3), it will produce calcium oxide (CaO) and carbon are the reactants?______________ CaCO3 ---> CaO + CO2 Define reactants: In a chemical equation, what number tells us how many ATOMS of an element are in one molecule? ____________________________. Big number or little number? (circle one) In a chemical equation, which number tells us how many MOLECULES are involved in a chemical reaction? _______________________. Big number or little number? (circle one) _____________________ are the substances that you end up with in a chemical reaction and are found to the right of the arrow. _____________________ are the substances that you begin with in a chemical reaction and are found to the left of the arrow. What does the arrow mean in a chemical reaction? What mathematical function should take place between subscripts and coefficients to properly balance a chemical equation?