Tag: Chemistry

CHEMISTRY EXAMINATION QUESTIONS|FIRST TERM EXAMINATION, 2018/2019 SESSION

Filed in Secondary School Questions by on October 18, 2019 0 Comments
 

  CHEMISTRY EXAMINATION QUESTIONS|FIRST TERM EXAMINATION, 2018/2019 SESSION FIRST TERM EXAMINATION, 2018/2019 SESSION  CLASS: SS 2       SUBJECT:  CHEMISTRY      TIME: 2 HOURS SECTION A – OBJECTIVES [50MARKS] Instructions: Answer all questions Reaction represented by the equation is known as Hydrolysis   B. Oxidation  C. Reduction   D. Fermentation The reaction represented by the equation NaOH(aq)+ HCL(aq) is a […]

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General Chemistry Examination/Test Questions for all Science Students

Filed in Chemistry, Examination Questions by on February 4, 2019 0 Comments
General Chemistry Examination/Test Questions for all Science Students
 

  Part I. Circle your answers for multiple choice questions 1. 550 nm electromagnetic radiation is in what region of the electromagnetic spectrum? A) Ultraviolet B) Visible C) Infrared D) Microwave E) X-ray 2. Which of the following choices is false regarding the wave amplitude of electromagnetic radiation? (Circle all that apply. There may be […]

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Chemistry First Term Examination 2018 Academy Session

Filed in Education by on January 29, 2019 0 Comments
Chemistry First Term Examination 2018 Academy Session
 

  Class: SS1    Time: 1 hour 30min Subject: Chemistry ____ contains two or more different substances _______ is used to separate solid particles of different sizes A mixture whose constituents differs in colour, size or shape could be separated using the sense of _______ When a mixture contains magnetic and non magnetic substances, the process of […]

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Top 15 Examination Question And Answer On Chemistry For Secondary School Students

Filed in Education by on July 8, 2018 0 Comments
Top 15 Examination Question And Answer On Chemistry For Secondary School Students
 

   Chemistry is the scientific discipline involved with compounds composed of atoms, i.e. elements, and molecules, i.e. combinations of atoms: their composition, structure, properties, behavior and the changes they undergo during a reaction with other compounds.Chemistry.In this article, we will examine the top 15 examination question and answer on chemistry for secondary school students. 1.Question: Eugen Goldstein discovered in 1886 that atoms also […]

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Top 10 Famous Chemist in The World

Filed in Education, Science, Top 10 by on May 20, 2018 4 Comments
Top 10 Famous Chemist in The World
 

  Famous Chemist in The World Most Famous chemist in the world looks  arguably ugly. It depends on the angle you’re viewing my opinion. Chemistry is a study of reactions between chemicals and substances that most people experience in their everyday life. All of our medicines and household products are the result of a history […]

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5 Ways Fukushima Radiation Releases Are Poisoning Investments

Filed in Technology by on September 2, 2017 0 Comments
5 Ways Fukushima Radiation Releases Are Poisoning Investments
 

  Credit:James library In 2011 Japan’s nuclear regulator raised the danger level of an ongoing radioactive leak at the crippled Fukushima Daiichi plant to 7 on a 7-point scale. Officials said Tuesday (August, 2013) that a storage tank has leaked 300 tons of radioactive water into the ground. READ THIS:Radioactive Substances and Nuclear Reactions Here […]

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Postulates of Dalton’s Atomic Theory

Filed in Technology by on July 7, 2017 0 Comments
Postulates of Dalton’s Atomic Theory
 

  Image credit>>Tahoma The main points of Dalton’s atomic theory, an explanation of the structure of matter in terms of different combinations of very small particles, are given by the following postulates: 1. All matter is composed of indivisible atoms. An atom is an extremely small particle of matter that retains its identity during chemical […]

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Collision Theory

Filed in Technology by on May 23, 2017 0 Comments
Collision Theory
 

  For a reaction to take place,certain conditions must be fulfilled.Like we all know, reactions are made up of both reactants and products and for a given reaction to occur without obstacles, the minimum amount of energy required for such reaction to take place must be overcome.Certain factors are necessary for a faster reaction rate […]

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What Are Organic Compounds

Filed in Chemistry by on March 18, 2017 1 Comment
What Are Organic Compounds
 

  Organic Compounds are compounds containing the carbon to hydrogen bond linkages, they are hydrocarbon molecules or compounds that contains predominantly carbon atom. Organic compounds contain to a lesser extent the carbon to Nitrogen bond, carbon to sulphur and carbon to oxygen bond linkages. Examples include Pyridine, pyrrole, and thiophene molecules.Nevertheless, all organic compounds belongs to a […]

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Types of Radioactive Decay In Radioactivity

Filed in Technology by on November 13, 2016 0 Comments
Types of Radioactive Decay In Radioactivity
 

  Radioactivity involves the emission of ionizing radiation or particles caused by the spontaneous disintegration of atomic nuclei. According to wikipedia, Radioactive decay which is directly also known as nuclear decay or radioactivity is the process by which the nucleus of an unstable atom loses considerable amount of energy by emitting radiation, including alpha particles, […]

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Technetium as a Radioactive Substance

Filed in Technology by on November 13, 2016 0 Comments
Technetium as a Radioactive Substance
 

  Image of a person’s skeleton obtained using an excited form of technetium-99.  Technetium is an unusual radioactive  element. Although a d-transition element (under manganese in Group VIIB) with a small atomic number (Z 43), it has no stable isotopes. The nucleus of every technetium isotope is radioactive and decays, or disintegrates, to give an […]

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Radioactive Substances and Nuclear Reactions

Filed in Technology by on November 13, 2016 1 Comment
Radioactive Substances and Nuclear Reactions
 

  In ordinary chemical reactions, only the outer electrons of the atoms are disturbed. The nuclei of the atoms are not affected. In nuclear reactions, however, the nuclear changes that occur are independent of the chemical environment of the atom. For example, the nuclear changes in a radioactive 3^ 1H atom are the same if […]

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Vapor Pressure of a Solution

Filed in Technology by on November 6, 2016 0 Comments
Vapor Pressure of a Solution
 

  From the illustration above, Initially, two beakers, both containing water solutions of the same solute, are placed under a bell jar. The solution in the left beaker is less concentrated than that in the right beaker, so its vapor pressure is greater. The partial pressure of vapor in the bell jar is an intermediate value. […]

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The Valence Bond Theory

Filed in Technology by on November 6, 2016 0 Comments
The Valence Bond Theory
 

  The VSEPR model is usually a satisfactory method for predicting molecular geometries.To understand bonding and electronic structure, however, you must look to quantum mechanics. We will consider two theories stemming from quantum mechanics: valence bond theory and molecular orbital theory. Both use the methods of quantum mechanics but make different simplifying assumptions. In this […]

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