LS9_a - Unit 2 How do we analyze chemical change...

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Chemistry XXI Unit 2 How do we analyze chemical change? Qualitative Analysis
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Chemistry XXI Lab Session 9 How can we use chemical reactions to identify substances? ( Two-Week Experiment )
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Chemistry XXI Your Challenge Imagine that you work for a mining company that is about to buy a new mine in Southern Arizona. You have been asked to identify the metals present in samples of the ore extracted from the mine. What different metals are present in the ore?
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Chemistry XXI Most minerals do not contain metals in their native form, but combined as part of chemical compounds. Copper ( Cu ) Metals? Copper Carbonate The copper in this compound exists as a positive ions ( Cu 2+ ) combined with negative ions (carbonate- CO 3 2- ).
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Chemistry XXI Ionic Compounds Many minerals are a mixture of these types of ionic compounds ” composed of positive ions of a metal and negative ions of a non-metal (or combination of non-metals). NaCl For these compounds, the chemical formula only indicates the ratio of + to ions in the lattice ( 1 : 1 ). Na + - cation Cl - - anion
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Chemistry XXI Weak electrolyte Solubility Some ionic compounds dissolve in water, or can be dissolved using acids, and the ions separate in solution. When combined with other substances, the ions may recombine to form new products ( chemical reaction ) with characteristic properties.
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