“To acquire knowledge‚ one must study; but to acquire wisdom‚ one must observe.” ― Marilyn Vos Savant “You can’t just be reading books all the time and leave the writting of them to others.” ― Joseph Delaney‚ Night of the Soul Stealer “It does not matter where you go and what you study‚ what matters most is what you share with yourself and the world.” ― Santosh Kalwar “I don’t sing a song unless I feel it. The song don’t tug at my heart‚ I pass on it. I have to believe in what I’m
Free Chemistry Chemical element Dmitri Mendeleev
whether a chemical reaction has taken place? ” Prediction: *Using metal magnesium as an example illustration I. (Magnesium reacts with lead (II) nitrate) Mg + Pb(NO3)2 Pb + Mg(NO3)2 II. (Magnesium reacts with zinc nitrate) Mg + Zn(NO3)2 Zn + Mg(NO3)2 III. (Magnesium reacts with iron (III) nitrate) 3Mg + 2Fe(NO3)3 2Fe + 3Mg(NO3)2 Variables: The dependent variable for this investigation is the reactivity of each metal as measured by the occurring of chemical reactions
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My Review of Uncle Tungsten Uncle Tungsten‚ by Oliver Sacks is titled as “Memories of a Chemical Boyhood”‚ but it is far more than that. This story is not just a biography of a kid’s childhood‚ it’s focused around the influence of chemistry upon a child’s life‚ the discovery of the periodic table and the elements on it‚ and the non-chemistry part of his life. Early in the story‚ we learn that Oliver Sacks‚ the child in the story‚ has a family full of chemists‚ physicists‚ and doctors. As of this
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Classifying Chemical Reactions Introduction Pre-lab questions 1. Which reactants used in this experiment are flammable? Discuss the safety precautions that are necessary when working with flammable materials in the lab? 2. Summarize the following description of a chemical reaction in the form of a balanced chemical equation? 3. Common observations of a chemical reaction are described in the introduction section. For each observation‚ name a common or everyday occurrence that must involve a chemical reaction
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Chromium has an atomic number of 24 and is located in the 6th group‚ 4th period of the periodic table of elements. Chromium is a metal and can be identified by its atomic symbol of Cr. Chromium is a hard and brittle metal‚ making it hard to bend as it would break if one tried to do so. Chromium is also a shiny and lustrous metal with a grey color to it. Chromium may also be identified by its high melting and boiling point and can prove to be very useful in everyday lives. Chromium was first discovered
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opening statement I would like to proudly say cobalt is an element which has its own gum. Though completely irrelevant to my report I enjoy it’s succulent‚ minty and long lasting flavor‚ because five… will stimulate your senses. I figure I might as well go into the greater details of cobalt as well as what it is and how it came to be. In the year 1739‚ Swedish chemist‚ Georg Brandt was trying to prove to his colleges that Bismuth‚ the element credited for its believed ability to turn glass blue‚ was
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be divided.” The next scientist who worked with atoms was John Dalton‚ he lived from 1766 to 1844. His main theories were that elements combine in certain proportions based on mass to form compounds‚ each element has a different atom and a different atomic weight‚ all atoms of the same element are perfectly identical‚ and atoms cannot be created or destroyed in chemical reactions. He also had his own
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electron here +10e = +10β= positron 10n = neutron As a result of beta decay‚ the product nucleus is Answer one atomic number lower than the original element. two atomic number higher than the original element. here one atomic number higher than the original element. two atomic number lower than the original element. What is X for the nuclear reaction: 21284Po à 20882Pb + X Answer 42p 1-1β here 42α 11n Which statement is not correct for the nuclear
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Science Revision Notes Chemistry Atoms are the smallest particle of a particular element. Molecules are particles that contain 2 or more atoms joined together by chemical bonds. Elements are substances that are made up of only one type of atom. Compounds are substances form when two or more elements are joined chemically. Metals are solid at room temperature‚ with the exception of mercury. Metals are good conductors of electricity and heat. Metals can usually be melted at high temperatures. Non-metals
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probably one of the most interesting elements‚ in my opinion. The name “neon” is derived from the Greek word for “new”. I chose to do neon because most of us encounter neon on a daily basis as opposed to other elements such as pure gold or silver. Our world is much more colorful as a result of neon. The symbol of Neon is Ne. It is also in group 18 of the periodic table so it is classified as a noble gas. The atomic number of Neon is 10. Neon is the 10th element on the periodic table. This essay will
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