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Cordination Compounds

* FLEXIDENTATE CHARACTER OF POLYDENTATE LIGANDS; * Poly dentate ligands have flexi dentate character in the sense that all donors atoms may not form coordinate bonds with the central metal atom or ion. For example; EDTA which is the hexa dentate ligand also acts as tetra dentate or penta dentate in certain complexes. Similarly sulphate…

History of the Periodic Table

Explain how scientific observations led to the development of, and changes to, the periodic table. -Dmitri Mendeleev- first periodic table, organized 63 known elements according to properties, organized into rows and columns and wrote name, mass, and chemical properties on each -Julius Lothar Meyer- independently worked in Germany, similar to Mendeleev -Henry Gwyn Jeffreys Moseley-…

Science report

Francium (pronounced FRAN-see-em;formerly known as eka- caesium and actinitium K) is a chemical element that has the symbol Fr and atomic number 87. It is the second rarest naturally occurring elements after astatine. Francium is a highly radioactive metal that decays into astatine, radium and radon. As an alkali metal, it has one valence electron….

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Alchemy vs Chemistry

Some people think that chemistry is just about mixing things up and experimenting in test tubes and explosions. Actually chemistry studies everything around us and how they change, for example it tells what your body is made out of. We study chemistry in biology, geology, engineering, and even physics. Chemistry is the science of matter,…

Properties of Allotropes of Carbon

Atomic Radii (pm) of the First 20 Elements: – Atomic radii decreases when moving down a period, as the number of protons increases, which thence increases the effective nuclear charge. – Atomic radii increases when moving down a group, as the number of shells increases, which thence increases shielding. – The downward-sloping pattern on the…

Heptane/1-Hexanol Intermolecular Forces

The boiling point reflects the strength of forces between molecules. The more tightly bonded the molecules are, the more energy is required to convert them into gases. These forces are called intermolecular forces. There are 3 types, dispersion forces, dipole-dipole and hydrogen bonding. The influence of these attractive forces will depend on the functional groups…

Atoms, Molecules and Elements

Atoms, molecules and elements are the building blocks of everything we can see, hear, and touch. Though not visible to the naked eye, it is the combination of millions of these tiny substances that make us who and what we are today. Many elements make up the world around us, and each element reacts differently…

Anatomy and Physiology Study Guide for Unit 2

1) What are the parts of an atom? Where are the subatomic particles found? Protons, neutrons, and electrons. In the nucleus and on the orbitals and sub-orbitals of the atom. 2) How does the Atomic Mass # differ from the Atomic #? Atomic mass # is the sum of all protons and neutrons in the…

Qualitative Analysis

Qualitative is where the results give a colour that you have to match up to a colour chart, or have you have done to see if it is positive or negative with a description of what a positive reaction should look like. This test is less reliable as some colour or positive reaction look similar…

Final writing exercise

There are three phases whereby each has a different crystal structure at three different temperatures. At room temperature (298K), Phase III is present whereby Cs3H(SeO4)2 has a crystal structure of a monoclinic with a space group of C2/m. At 400K, Phase II is present whereby Cs3H(SeO4)2 has a crystal structure of a monoclinic-A2/a symmetry. At…

Chemical bond

Answer the following questions in your own words, using complete sentences. Based on your observations in the lab, categorize each unidentified compound as ionic or covalent. Explain in one or two sentences why you categorized the compounds the way that you did. (5 points) Based on my observations in the lab I categorized Substance A…

Boiling point is the temperature at which the vapor pressure

Boiling point is the temperature at which the vapor pressure of the liquid is equal to the external pressure on the liquid and the liquid changes into a vapor. Melting point is the temperature at which the lattice is collapses and the solid is converted into liquid. The trend in structure is from the metallic…

Water Conclusion

In conclusion, after conducting the lab, the emergent properties of water were tested and proved. These trials and experiments were able to verify the adhesion, cohesion, polarity, temperature stabilization, solvency, and density changes exhibited by water. During the glass and wax paper lab, we observed the adhesive properties of water. When a droplet of water…

Assessment and grading criteria

Unit 1 – Fundamentals of Science Assessment and grading criteria To achieve a pass grade the evidence must show that the learner is able to: To achieve a merit grade the evidence must show that, in addition to the pass criteria, the learner is able to: To achieve a distinction grade the evidence must show…

Short Summary Essay on the Big Bang

The Big Bang theory is today’s dominant scientific theory about the origin of the universe. It states that the universe was created from an infinitely hot and dense subatomic ball, which once exploded not only created energy and matter, but space and time itself. This is estimated to have happened around 14 billion years ago….

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