Essays on Periodic Table

The periodic table of elements, by far, stands among the most notable discoveries in the history of chemistry. Nowadays, probably everyone who has ever heard about chemistry heard about the periodic table of elements. Its implications on the scientific world are so enormous that it has even leaked out to the general public and have become associated with the chemistry itself. This is not surprising considering the scientific strength of this instrument. Using the periodic table, many characteristic properties of the elements can be predicted and many phenomena can be explained. This discovery put so much scientific knowledge together, ...

Sodium

Sodium is an element found in Group I of periodic table according to WebElements Periodic Table of the Elements (n.p), commonly known as the Alkali metals. It is a metal with silver-white color appearance. It is usually found in many different minerals like cryolite, zeolite and amphibole. The most common mineral where it is found is sodium chloride. Sodium is the sixth abundant element in found in earth’s crust. It has an atomic symbol of Na and an atomic number of 11. The atomic mass is 22.98977 and atomic radius is 186pm. Sodium is a very reactive metal. ...

Chapter 3 Atoms and the Periodic Table

For centuries, many have tried to learn about the smallest particle. As far as 2500 years ago, Democritus and Leucippus created an idea for the atom and called it ‘atmos’ meaning indivisible. Various philosophers and scientists have proposed models for what and how the atom should be. The initial theory proposed by Dalton in 1803 states that atoms are indivisible and that all atoms of a particular material are identical. He also stated that atoms of different materials join to form compounds. J.J. Thompson proposed the initial model of the atom. It is called the plum pudding model. He theorized ...

Question 1)

According to Ede and Cormack, what was the impact of Napoleon's reign on the development of scientific and technical training in France? Napoleon's reign included a refocusing to the education of the masses, including educating women. He centralized and standardized the education system with a focus on language. Napoleon believed in women’s education, to a point. He permitted the reestablishment of the Catholic elementary schools that educated boys and girls. Napoleon’s priority was secondary education however. In this area, he saw to standards not only for students but also for teachers and the curriculum. This was in part done ...

Chapter review

Chapter review Matter is anything that has mass and occupy space. The smallest particle of matter is referred to as an atom. An atom is the basic substance of the matter. An atom consists of; tiny subatomic substance. These substances are; proton, electron, and neutron. The protons are positively charged; electrons are negatively charged, and neutrons have no charge. The atom is divided into two parts, the center that consists of the neutrons and proton and the outer part which consist of the electrons. An atom has different properties; a physical property can be seen and observed without ...

Question 1:

Answer 1: The mixture of ammonium vanadate, ammonium hydroxide, and hydrochloric acid was yellowish and had less color in comparison with the control. As Manganese sulfate was mixed with ammonium hydroxide turned into orange, Though as it was mixed with hydrochloric acid its color did not changed and stayed clear. The control of iron nitrate was orange, but as it was mixed with ammonium hydroxide the color changed into red and after mixing with hydrochloric acid the color was yellow. The control of cobalt nitrate was pink. When it was mixed with hydrochloric acid the ...

Chapter 8

Chemicals in action An acid and base reaction occurs when a complete exchange of electrons between the proton donor and proton acceptor occurs. In this process a salt if formed. In the definition, a salt is a substance formed from an acid by its replaceable hydrogen either wholly or partially by a metal or an equivalent radicle. Example of salt formation Mg+H2SO4→MgSO4+H2 Mg+HCl→MgCl2+H2 In the modern ionic theory, a salt is a compound of oppositely charged ions. From this point of view, there is no difference between NaCl and NaOH. Further, anhydrous aluminum chloride is not a ...

Introduction

Academic language represents the language demands of a school in the academic writings that are used in textbooks, classrooms, tests and each discipline. Each academic disciple has its own unique academic language. Academic language is very different from every spoken language. The linguistic of academic writing is the foundation of the language and structure of the academic professionalism. Academic language is very different from the language of daily communication and social interaction. Academic language is normally different in structure and vocabulary. Academic vocabularies and structures vary from common languages. The academic language of science has particularly perce4ived different and ...

Introduction

The periodic table of elements is table used to display the important information about elements in accordance to their chemical and physical properties. The first physical property that was used to arrange the periodic table is the different boiling points of elements. The second property is the melting point of element. They differ according to their atomic number due to the distance between the energy level and that of the outer electrons. Thirdly the density and viscosity of the element played a major role in determining the arrangement of the elements in the periodic table. The other property is the ...

Summary

This essay is on short description of the following terms atoms, molecular structure, ionic bonding, periodic table, pH, acids, oxidation, antioxidants in food, alkali cleaning agents, salts used in food, plant cells, photosynthesis, micro-organisms in the environment, bacterial morphology, comparative sizes of micro-organisms, factors affecting the growth of bacteria, bacterial spores, biological role of enzymes, catalase, and enzymic browning.

Introduction

This essay will write short notes on various topics in chemistry as well as in microbiology. Some of the terms in chemistry include atom, molecular structure, periodic table, pH, oxidation, ionic bonding among others. Some of the terms in microbiology ...

Abstract

Introduction The objective of this laboratory work is to gain an insight in the trends of both chemical and physical properties of elements across the periodic table. The experiments offer an opportunity to subject the elements to the same chemical conditions and observe the reactions. Moreover, the relationship of the chemical properties and the location in the periodic table is pertinent. The location of an element in the periodic table is determined by its family or group and period.

Experimental

The procedure followed for the different experiments involved combustion and reaction with water. For combustion the element would be ...

XYZ College/University

Difference between a compound and a mixture A compound is a pure substance which contains atoms of two or more different elements that are chemically bonded together; the physical and chemical properties of this compound differ from those of it’s constituent elements. The components of a compound are always present in fixed proportions and cannot be separated by simple physical methods. Whereas, a mixture may be composed of multiple elements or compounds, but they are not chemically bonded. The components of a mixture are not present in fixed proportions. The properties of a mixture are the average properties of it’s constituent elements and ...