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Learning Check

Learning Check. Name one compound you used during Friday’s lab. Is CaCO 3 ionic or covalent Name CaCO 3. Na 2 CO 3 (sodium carbonate), CaCl 2 (calcium chloride), HCl Ionic Calcium carbonate. How to write a lab report. For Mr. Harwijne’s Class.

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Learning Check

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  1. Learning Check • Name one compound you used during Friday’s lab. • Is CaCO3 ionic or covalent • Name CaCO3 Na2CO3 (sodium carbonate), CaCl2 (calcium chloride), HCl Ionic Calcium carbonate

  2. How to write a lab report For Mr. Harwijne’s Class

  3. Date: Feb-18-14Investigating Mass Changes in a Reaction Partner:John SmithLab # 4-3AName: Emma Johannson Purpose: To compare the masses of products and reactants in a chemical reaction. Hypothesis: I predict that the mass of the products will be equal to the mass of the reactants because Antoine and Marie-Anne Lavoisier developed the law of conservation of mass, and the reaction occurred in a sealed container (pg. 205 tb). Apparatus & Materials:Please see page 203 of BC Science 10 textbook. Small test tube: 8 mL volume Small erlenmeyer: 250 mL volume Switched cobalt chloride for calcium chloride

  4. Procedure: Please see page 203 of BC Science 10 textbook.  Modifications below: • Pour ~50mL Na2CO3 into Erlenmeyer • Fill test tube 2/3 full with CoCl2 • Pour some HCl into test tube to dissolve product, swirl, then pour test tube contents into Erlenmeyerand gently swirl. Rinse with cold water. Diagram: N/A Observations: Mass of sealed Erlenmeyer before mixing (reactants) : ____________g Mass of sealed Erlenmeyer after mixing (products) : ____________g Sample Calculations:N/A

  5. Graph: N/A  Questions: • Broken glassware belongs … • When a chemical spills on me, the safe thing to do is to immediately wash it off either in a ____, the ______, or the ________ station, and to tell the _______ as soon as possible. If a chemical spills on the counter or the floor, I will immediately ____ the teacher, or ____ it up with _____ _____ if it’s water. • If there’s a fire, I will … • To safely pour chemicals, I must hold my palm against ___ _____ of the bottle, and never point it towards anyone’s, or my own ____. • The reaction I investigated today was that of cobalt (II) chloride and sodium carbonate. Co2+ Cl 1- and Na1- CO3- • Cobaltous carbonate is a common name for one product, and the other product is commonly known as _____ ____. • Cobalt (II) carbonate is an intermediate in cobalt ores from mining, and it’s also used as a pigment. ______ ________ can be found …

  6. I found that my hypothesis was not supported because the mass of the products was not equal to the mass of the reactants. Conclusion: In this lab, I compared the masses of products and reactants in the chemical reaction of cobalt (II) chloride with sodium carbonate. The mass of the reactants was __________g, while the mass of the products was __________g. I suspect my results were thrown off because …

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