a) I definately agree with this statement and how science is ever changing. The scientific method begins by asking a question about something. After asking a question the next step is to form a hypothesis or educated guess. A repeatable expieriment is then created to test said hypothesis‚ and a large amount of data is collected. Data collection then leads Scientits to analyze the data and come up with a conclusion to see if the hypothesis was proven correct or incoreect. If the hypothesis is proven
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Testable Question: What will happen to different halide salts found in the body if various compounds are added to the halide? How will the halides react? Introduction: For this lab we tested 6 halide salts found in the body‚ and their reactivity when a compound is added. We tested the halides NaF‚ NaCl‚ KBr‚ KI‚ and two unknown halides. To find the reaction of the halide‚ we are adding drops of Ca(NO3)2‚ AgNO3‚ AgNO3 + Na2S2O3‚ and NaOCI + Starch to the halides. Each halide will be separated from
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some of the many uses of calcium‚ the element has much to tell about it’s family and classification. Calcium happens to be apart of the Alkali Earth Metals. The element has 20 electrons‚ 20 protons‚ and the number of neutrons in the most abundant isotope is 20. The element belongs to period number 4‚ and is apart of group number 2‚ and out of there being non-metals‚ metals‚ and metalloids‚ calcium happens to be a metal[Emsley]. Characteristics of Calcium- Calcium has much to tell about
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The Element Niobium Atomic Number: 41 Atomic Weight: 92.90638 Melting Point: 2750 K (2477°C or 4491°F) Boiling Point: 5017 K (4744°C or 8571°F) Density: 8.57 grams per cubic centimeter Phase at Room Temperature: Solid Element Classification: Metal Period Number: 5 Group Number: 5 Group Name: none What’s in a name? Named for the Greek mythological figure Niobe. Say what? Niobium is pronounced as ni-OH-bee-um. History
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Producing electrical energy from nuclear fuel Introduction Obtaining electricity from nuclear fuel has its base on the radioactive decay. Radioactive decay occurs when an isotope (element with a different number of neutrons in the nucleus) is radioactive‚ because its nucleus is unstable. In time it decays and emits alpha or beta particles‚ they collide with surrounding atoms and make them move faster‚ that provokes thermal energy. That thermal energy released is around a million times bigger than
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Thyroid Cancer Thyroid cancer is a cancerous tumor or growth located within the thyroid gland.Thyroid cancer is the most common endocrine cancer. Thyroid cancer is one of the few cancers that has increased in incidence rates over recent years. It occurs in all age groups from children through seniors. The American Cancer Society estimates that there will be about 62‚450 new cases of thyroid cancer in the U.S. in an average year. Of these new cases‚ about 47‚230 will occur in women and about
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Precambrian According to the Geological Time Scale‚ when did the mass extinction of the dinosaurs happen? 65 million years ago 80 million years ago 285 million years ago 1 billion years ago Which element is used when doing radioactive dating on more recent geological events? Uranium Lead Potassium Carbon Why the element in #9 used for dating on more recent geological events? It is easy to find. It is not dangerous It has a half-life that is not too long
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irradiation is used as approved on foods‚ disease-causing germs are reduced or eliminated‚ the food does not become radioactive‚ dangerous substances do not appear in the foods‚ and the nutritional value of the food is essentially unchanged. Sources of ionizing radiation that have been used include gamma rays‚ electron beams and X-rays. Gamma rays are produced by radioactive isotopes such as Cobalt-60. Electron beams are produced by linear accelerators‚ which themselves are powered by electricity
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and diffuse into air and other gases. Rutherford‚ unlike many scientists ideas‚ believed elements “went through more than one change during radioactive decay” (Hicks). Brook’s discovery made this claim of his evident that it was a “chain process.” Rutherford Hayes used this discovery during his Bakerian Lecture in 1904‚ when explaining the reaction of radioactive elements during decay (Rayner-Canham). Harriet Brooks briefly worked with Marie Curie. Moreover‚ Harriet Brooks’s career included with the
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Core 1 summary notes 1) Fossils fuels provide both energy & raw materials such as ethylene‚ for production of other substances Identify the industrial source of ethylene from the cracking of some of the fractions from the refining of petroleum Catalytic cracking is the process whereby high molecular weight fractions are broken down to low molecular weight ones. This process is used in petroleum refineries where crude oil is broken down to smaller alkenes and alkanes‚ until ethene‚ propene‚
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