Chemical change

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timer Asked: Dec 19th, 2017

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all you need to know is in the picture and i need help today right now i cant wait i dont understand chem but im trying and its hard please help me im a junior i cant affird to faul pleaase

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9. Use the following partial equation for the questions below: a. Identify reaction type. MgF2 + KBr → b. Predict the products. double replacement Mg Br2 2 10. In three trials, Michael heats a sample of room temperature iron metal with oxygen in the air to form a solid iron oxide. He uses the same set up for each trial, with a fresh sample of iron and a new, clean crucible. In each case, the iron samples are heated for 25 minutes, and the lid was to be opened three times during heating to let in oxygen. Michael has recorded his observations and data below, and shows the empirical formulas he calculated. Everything in the grey area is Michael's. Observations: The iron is in the form of thin filaments like tangled hair. It is grey and slightly shiny. During the reaction, the iron filaments sparkle and glow. After the reaction, the iron filaments have turned a bluish color and little beads have formed on the filaments. During trial 1, we forgot to lift the lid of the crucible to let in oxygen. Data Table: Crucible Crucible with iron filaments Crucible with iron oxide Mass (grams) Trial 1 Trial 2 Trial 3 24.74 24.76 24.71 25.69 26.01 25.65 25.97 26.55 26.06 Results: (empirical formulas) Trial 1: Feo Trial 2: Fe2O3 Trial 3: Not finished a. Was this a chemical change? Use both symptoms and definitions of chemical change to support you answer. Read carefully, and write the balanced equation to represent the chemical reaction that produces Feo b. What type of chemical reaction is this? C. Final Exam - Semester
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