20. Evidence of Chemical Change 1. Color change 2. Energy change: absorbed or released
21. 3. Odor changes or production 4. Gas production 5. Precipitate formation
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25. When you burn a big pile of wood, why do you only end up with a tiny pile of ashes?
26. In an experiment, 10.00 g of red mercury (II) oxide powder is placed in an open flask and heated until it is converted to liquid mercury and oxygen gas. The liquid mercury has a mass of 9.26 g. What is the mass of oxygen formed in the reaction?
43. Dirt, blood, milk Lemonade, gasoline, steel Oxygen, gold, iron Salt, baking soda, sugar Matter Mixtures Pure substances Heterogeneous Mixtures Homogeneous Mixtures Elements Compounds
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50. Analysis of sugar: 20.0 g sugar 500.0 g sugar Carbon 8.44 g 42.2% Hydrogen 1.30 g 6.5% Oxygen 10.26 g 51.30% Carbon 211.0 g 42.2% Hydrogen 32.5 g 6.5% Oxygen 256.5 g 51.30%