Name: Jeanne Yoo|Date: 07/15/13| Exp 1: Observations of Chemical Changes|Lab Section: 1411-76426| Data Tables: Part 1: |Chemicals|Well No.|Observations of the Reaction| A.|NaHCO3 + HCl|1 |clear bubbles formed| B.|HCl + BTB|2 |turned orange after BTB was added‚ transparent‚ acidic| C.|NH3 + BTB|3 |turned dark blue after BTB was added‚ opaque‚ basic| D.|HCl + blue dye| |blue dye was missing from kit| E.|Blue dye + NaOCl| |blue dye was missing from kit| | with the 1 drop of HCl| ||
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CHEM 208 Module 2: List the steps of the scientific method: Scientific Method: performing a study in organized step: (led to enunciation of Law of Conversation of Mass and Matter) 1. Performing experiments: a. An experiment is a set of steps (procedures) that are performed under controlled
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geologist‚ he created a list of the elements arranged by increasing atomic weight. The list was wrapped around a cylinder so that several sets of similar elements lined up‚ creating the first geometric representation of the periodic law. oIn 1862 was the first person to make use of atomic weights to reveal periodicity (i.e. when the elements were arranged according to their atomic weights‚ similar elements seemed to occur at regular intervals.) He drew the elements as a continuous spiral around a cylinder
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seventh but more impressive is their growth which is twice the overall export growth of Pakistan. Basic Chemical manufacturer may be defined as production of drugs and chemical by synthesis‚ fermentation or extraction from naturally occurring materials of biological or mineral origin. Unfortunately‚ while the pharmaceutical formulation industry has grown at a relatively rapidly pace‚ the basic chemical industry in Pakistan has lagged behind. Basic manufacturer is dependent upon a reasonably well-developed
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almost immune to chemical attack at temperatures below 150 C. Tantalum is virtually resistant to corrosion due to an oxide film on its surface. Applications Tantalum finds use in four areas: high-temperature applications‚ such as aircraft engines; electrical devices‚ such as capacitors; sirurgical impants and handling corrosive chemicals. It is rarely used as an alloying agent because it tends to make metals brittle. Tantalum resist corrosion and is almost impervious to chemical attack‚ for this
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metals.[1] A chemical reaction occurs between the metal and it’s environments Eg. Copper + Oxygen ( Copper Oxide Cu (I) + O ( CuO Rust is very similar to corrosion but only occurs in iron and steel (an iron alloy). Rust is formally known as oxidation‚ which occurs when Oxygen (O) comes into contact with iron (Fe). Overtime‚ the oxygen reacts and combines chemically with the iron‚ forming a substance named Iron Oxide (Fe2O3)‚ which weakens the physical bond of the iron.[2] Chemical Equation
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Radioactive isotopes (radioisotopes) are isotopes which are atoms of the same element that are chemically identical but vary in the number of neutrons they contain. Radioactive isotopes can participate in reactions just like non radioactive elements. Autoradiography is a technique used to trace the movements of certain substances around plants. An example of this is carbon 14. Carbon 14‚ a radioactive isotope‚is added to the carbon dioxide supply of the plant‚ to study the movement of products
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I did this lab to find out the differences between chemical and physical changes. I also did this lab to learn the signs that would indicate the chemical reactions and physical changes. I needed to learn the odor change‚ color change‚ bubbles or gas‚ irreversible‚ temperature changes and finger prints. By the end of the lab‚ my goal was to be able to didtinguish easily the difference between chemical and physical changes. Question #1 answer. 1. Gas. 2. Dissolved in water. 3
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The Law of Definite Proportions states that a chemical compound contains the same element in exactly the same proportions by mass regardless of the size of the sample or source of the compound. This relates to the magnesium oxide lab because we tested out this theory to see if it is true that the law of definite proportions says that a chemical compound contains the same element in exactly the same proportions by mass regardless of the size of the sample or source of the compound. In this experiment
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of the elements on the periodic table. The Disappearing Spoon focuses on the history of the periodic table by recounting stories about each element on the table‚ and the scientist that discovered it. For each element‚ Kean provides an extensive backstory about its origin‚ the common (or uncommon) uses of the element‚ and other interesting tidbits. The author begins the novel with a general physical description of the periodic table as a whole; he discusses the names of the groups of elements and their
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