新西兰奥克兰理工大学Assignment代写:如何做火焰测试

首先,你需要一个干净的线圈。铂或镍铬环是最常见的。可以通过浸入盐酸或硝酸中清洗它们,然后用蒸馏水或去离子水冲洗。通过将环路插入气体火焰中来测试环路的清洁度。如果产生颜色突发,则环路不够干净。必须在测试之间清除循环。将清洁环浸入粉末或离子(金属)盐溶液中。将带有样品的环放置在火焰的透明或蓝色部分中,并观察所得的颜色。木质夹板或棉签方法。木质夹板或棉签提供了一种廉价的线圈替代品。要使用木质夹板,将它们浸泡在蒸馏水中过夜。倒出水并用清水冲洗夹板,小心避免用钠污染水(如手上的汗水)。取一块已浸湿在水中的湿夹板或棉签,将其浸入待测样品中,然后将夹板或棉签挥动穿过火焰。不要将样品放在火焰中,因为这会导致夹板或棉签点燃。每次测试都使用新的夹板或棉签。 新西兰奥克兰理工大学Assignment代写:如何做火焰测试 First, you need a clean wire loop. Platinum or nickel-chromium loops are most common. They may be cleaned by dipping in hydrochloric or nitric acid, followed by rinsing with distilled or deionized water. Test the cleanliness of the loop by inserting it into a gas flame. If a burst of color is produced, the loop is not sufficiently clean. The loop must be cleaned between tests. The clean loop is dipped in either a powder or solution of an ionic (metal) salt. The loop with sample is placed in the clear or blue part of the flame and the resulting color is observed. Wooden Splint or Cotton Swab Method.Wooden splints or cotton swabs offer an inexpensive alternative to wire loops. To use wooden splints, soak them overnight in distilled water. Pour out the water and rinse the splints with clean water, being careful to avoid contaminating the water with sodium (as from sweat on your hands). Take a damp splint...
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新西兰奥克兰理工大学Assignment代写:供给的价格弹性

例如,考虑对某种好的需求 - 阿司匹林。当那个制造商 - 我们称之为制造商X - 提高价格时,对一个制造商的阿司匹林产品的需求会发生什么?考虑到这个问题,考虑一种不同的情况:对世界上最昂贵的新汽车Koenigsegg CCXR Trevita的需求。其报道的零售价格为480万美元。如果制造商将价格提高至520万美元或将其降至440万美元,您会发生什么?现在,回到零售价格上涨之后制造商X的阿司匹林产品需求的问题。如果你猜测X的阿司匹林需求可能大幅下降,那么你是对的。这是有道理的,因为,首先,每个制造商的阿司匹林产品与另一个制造商的阿司匹林产品本质上是相同的 - 在选择一个制造商的产品时没有任何健康优势。其次,该产品可以从其他制造商那里广泛获得 - 消费者总是有多种选择。所以,当消费者选择阿司匹林产品时,将制造商X的产品与其他产品区分开来的少数几个因素之一就是成本稍高一点。那么为什么消费者会选择X?那么,有些人可能会继续购买习惯或品牌忠诚度的阿司匹林X,但许多人可能不会。 新西兰奥克兰理工大学Assignment代写:供给的价格弹性 Consider the demand for a certain good -- aspirin, for example. What happens to the demand for one manufacturer's aspirin product when that manufacturer -- which we'll call manufacturer X -- raises the price? Keeping that question in mind, consider a different situation: the demand for the world's most expensive new automobile, the Koenigsegg CCXR Trevita. Its reported retail price is $4.8 million. What do you think might happen if the manufacturer raised the price to $5.2M or lowered it to $4.4M? Now, return to the question of the demand for manufacturer X's aspirin product following an increase in the retail price. If you guessed that the demand for X's aspirin might decline substantially, you'd be right. It makes sense, because, first, every manufacturer's aspirin product is essentially the same as another's -- there's no health advantage whatsoever in selecting one manufacturer's product over another. Second, the product...
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