年轻的研究人员可能想要制作一组晶体并制定出他们自己的方法,将晶体分组。常见的晶体包括盐,糖,雪花和石英。你还能找到其他什么水晶?这些晶体有什么相似之处和不同之处?什么材料看起来像水晶,但实际上不是? (提示:玻璃没有有序的内部结构,因此它不是水晶。)生长晶体是探索您对化学和地质学的兴趣的有趣方式。除了从试剂盒中生长晶体外,还有许多类型的晶体可以从常见的家用物质中生长出来,例如糖(蔗糖),盐(氯化钠),泻盐,硼砂和明矾。有时混合不同的材料来看看是什么类型的晶体是有趣的。例如,当用醋生长时,盐晶体看起来不同。你能搞清楚为什么吗?你可以建立晶格模型。您可以展示晶格亚基如何生长成天然矿物质所采用的某些晶体形状。您的项目可能涉及防止晶体形成的方式。例如,你能想到一种防止冰晶形成晶体的方法吗?冰淇淋的温度是否重要?冷冻和解冻循环会发生什么?不同成分对形成的晶体的大小和数量有何影响?如果你想要一个好的科学展览项目,如果你测试生长晶体的某些方面而不是简单地生长漂亮的晶体并解释这个过程会更好。以下是将一个有趣的项目变成一个伟大的科学展览或研究项目的方法的一些想法:晶体生长介质的蒸发速率如何影响晶体的最终尺寸?您可以通过密封容器来改变蒸发速率(如果没有空气空间则根本没有蒸发),或者通过在液体上吹风扇或用干燥剂封闭罐装介质来改变蒸发速率。不同的地方和季节会有不同的湿度。在沙漠中生长的晶体可能与在雨林中生长的晶体不同。您通常会加热水或其他液体来溶解固体以生长晶体。这种液体的冷却速度是否会影响晶体的生长方式?您可以将室温下允许冷却的晶体与冰箱中冷却液体形成的晶体进行比较。添加剂对晶体有什么影响?您可以添加食用色素,调味料或其他“杂质”。从非碘化盐生长的晶体与碘盐生长的晶体相比如何?您可以采取哪些步骤来最大化晶体尺寸?开发程序是一种实验科学。您可以影响参数,如振动,湿度,温度,蒸发速率,生长介质的纯度以及晶体生长所允许的时间。用于生长晶体的容器类型可能会有所不同,用于悬浮晶种的线的类型(或用于生长晶体的其他方法)也是如此。当晶体开始生长可以与你的晶种竞争时,你是在更换容器吗?有很多事情要考虑!有些可能对晶体生长有重大影响,而其他可能可以忽略不计。光/暗影响增长吗?可能不是盐晶体,但它可能是一种被可见光辐射降解的物质。如果你正在迎接挑战,你可以根据它们的分子结构和分子几何形状,在生长之前预测晶体的形状。

新西兰奥克兰大学物理学Assignment代写:水晶科学博览会项目

Younger investigators may want to make a collection of crystals and work out their own method for grouping the crystals into categories. Common crystals include salt, sugar, snowflakes, and quartz. What other crystals can you find? What are the similarities and differences between these crystals? What materials look like crystals, but really aren’t? (Hint: Glass doesn’t have an ordered internal structure, so it isn’t crystal.) Growing crystals is a fun way to explore your interest in chemistry and geology. In addition to growing crystals from kits, there are lots of types of crystals that can be grown from common household substances, such as sugar (sucrose), salt (sodium chloride), Epsom salts, borax, and alum. Sometimes it’s interesting to mix different materials to see what types of crystals result. For example, salt crystals look different when they are grown with vinegar. Can you figure out why? You can build models of crystal lattices. You can show how lattice subunits can grow into some of the crystal shapes taken by natural minerals. Your project can involve ways you might prevent crystals from forming. For example, can you think of a way to keep crystals from forming in ice cream? Does the temperature of the ice cream matter? What happens as a result of freezing and thawing cycles? What effect do different ingredients have on the size and number of crystals that form? If you want a good science fair project, it would be better if you tested some aspect of growing crystals rather than simply growing pretty crystals and explaining the process. Here are some ideas for ways to turn a fun project into a great science fair or research project: How does the rate of evaporation of the crystal-growing medium affect the final size of the crystals? You can change the rate of evaporation by sealing the container (no evaporation at all if there is no air space) or by blowing a fan over the liquid or enclosing the jar of medium with a desiccant. Different places and seasons will have different humidities. The crystals grown in a desert may be different from those grown in a ​rainforest. You will usually heat water or another liquid to dissolve a solid to grow your crystals. Does the rate at which this liquid is cooled affect the way the crystals grow? You can compare crystals allowed to cool at room temperature to those formed from cooling the liquid in a refrigerator. What effect do additives have on the crystals? You could add food coloring, flavorings, or other ‘impurities’. How do crystals grown from non-iodized salt compare with those grown from iodized salt? What steps can you take to maximize crystal size? Developing a procedure is a form of experimental science. You can affect parameters such as vibration, humidity, temperature, the rate of evaporation, purity of your growth medium, and time allowed for crystal growth. The type of container used to grow your crystals may make a difference, as could the type of string used to suspend a seed crystal (or other method used to grow a crystal). Are you changing containers when crystals start to grow that could compete with your seed crystal? There are lots of things to think about! Some may have a major effect on crystal growth and others may be negligible. Does light/dark effect growth? Probably not for a salt crystal, but it could for a substance that is degraded by visible radiation. If you are up for a challenge, you can make predictions about the shapes of crystals before you grow them, based on their molecular structures and molecular geometry.

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