![]() It will "bloom" indefinitely into beautiful rosebuds, coral and crystal. To keep it growing: Add more bluing, salt and water from time to time. In this experiment you will investigate some physical and chemical changes using household chemicals and try to determine which are chemical and which are. ![]() You can decide how much time you have to spend this term in Science. The unit is extremely flexible, with many demonstrations and experiments. In it, students investigate how materials change and how those changes can be reversible or irreversible. A free circulation of air is necessary, and these formations will develop better where the air is dry. This is a unit designed to cover the Australian National Curriculum for Year 6 Chemical Science. If all the conditions are not ideal, it may be necessary to add two more tablespoons of household ammonia to aid the growth. By this time, a beautiful flower-like growth should have appeared. Stewart's Bluing, and then add a few drops of food coloring or ink to each piece. Day 3: Pour into the bottom of the bowl (not directly on the base material) two tablespoons each of salt, water, and Mrs. Day 2: Add two more tablespoons of salt. ![]() You may also continue with Day 2 and Day 3 additions, but they are not necessary for crystals to grow. Stir until salt is mostly dissolved, then spoon mixture over charcoal. Add 2 tablespoons of ammonia to aid the evaporation process, thus quickening the formation of crystals. In the empty jar or cup, pour two tablespoons of water, two of table salt (iodized or plain) and two of Mrs. In a glass or plastic bowl, put some pieces of coal, coke (charcoal-like substance) charcoal, porous brick, tile, cement or sponge (charcoal tends to create the most dramatic results). This process should be repeated after the crystals grow, and the crystals should be examined under a magnifying glass again. ![]() After all the ingredients are added, they should again document their observations in their journals regarding what they see in the bowl. This showcased both a physical and chemical change because the. Before the lab, students should observe the salt crystals under a magnifying glass and draw what they see. In step nine (experiment eight), a light was added to the candle which caused the wax to melt. Students should have a basic understanding of the terms evaporation, absorption, and what constitutes a physical change versus a chemical change. Charcoal Briquettes (or pieces of sponge or brick or porous rock) ![]()
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