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Electron Essay Topics & Paper Examples

Gunshot Residue Aanalysis

When a firearm is discharged, residues from the bullet’s force, the primer, cartridge case, firearm itself and the powder from the propellant are expelled from gaps in the guns working parts (Pepper, 2005: 118). These particles are known as gunshot residue (GSR) or firearm discharge residue (FDR) and are composed of partially burnt and un-burnt propellant powder, particles from the ammunition primer, smoke, lubricants, grease and metals from the cartridge. GSR’s are mainly deposited on skin, the hand in which the weapon was fired, on clothing, the entrance wound of victim or any other local target materials present at the crime scene. The major primer elements are lead (Pb), barium (Ba) and antimony (Sb) usually all three elements are present…

Electricity and Magnetism Spring Lab Project

Electric Field Hockey Objective: Write two paragraphs. Explain the challenges of scoring goals in this game. Be sure to include in your explanation the terms positive and negative charge, electric field line and explain how mass affects the motion of the “puck.” This simulation project is all about getting the puck into the goal while surround the puck with using few positive and electric charges. The positive charges have made the puck bounce back off, while the negative charges have made the puck oscillate to each there meaning that the puck and negative charges are compatible and moves towards each other. However, the two charges and the electric field had played a significant role by letting the audience figure out…

Science Report on Electromagnetism

This report will be done on the theory of Electromagnetism. Electromagnetism is the force that combines electricity and magnetism. Electromagnetism is found in everyday things that shape our lives. It is the cleanest force used to make energy today, and it is used in almost every home appliance that is in a standard middle classed home. The E-M force is the most commonly under looked force that helps us live. Without Electromagnetism, we would be falling through floors, literally! E-M force can be found even in military weapons, and even the radio uses electromagnetism. Electromagnetism can save lives when used in critical medical equipment. This is one truly amazing force that we can no longer overlook if we wish to…

The Microscope: Science’s Greatest Invention

The microscope has been one of the greatest inventions in the history of science and has had the most impact on the course of science. Ever since the first microscope was invented in 1590, they have improved our knowledge in basic biology and biomedical research, as well as many other things, all of which are important. The smallest object a human can see with the naked eye is 0.2 mm, for example, algae cells. The light microscope, however, allows us to see things almost 1000 times smaller that what the eye can see, like plant, animal, and bacteria cells, and the electron microscope allows us to see things almost 1,000,000 times smaller, like viruses and proteins. The Italians paved the…

Hydrogen Bonding Essay

Hydrogen bonding is a bonding type consisting of dipole and dispersion forces. A hydrogen bond is the attractive force between a hydrogen atom attached to a molecule and an atom of a different molecule. According to the Pauling scale of electro-negativities of the elements, it can be viewed that the three most electronegative elements in the periodical table are nitrogen, oxygen and fluorine. These are also called heteroatoms. The heteroatoms have a partial negative charge while hydrogen has a partial positive charge. Hydrogen bonding is generally stronger than most bonds bar covalent bonds. Water: Bonding within water molecules occur between oxygen and hydrogen. These covalent bonds mean that the electrons are shared between the oxygen and hydrogen atoms to create…

Atom and Chemical Bond

A chemical bond is the energy that holds two atoms together in a compound. This energy can be further broken down into ionic bonding and covalent bonding. An ionic bond is a chemical bond characterized by attraction between ions of opposite charge. The formation of an ionic bond involves a complete transfer of electrons between atoms, and can be predicted when one atom has a much higher electronegativity than the other. A covalent bond is a very strong chemical bond formed by the sharing of electrons. Multiple covalent bonds can be formed when multiple pairs of electrons are shared between atoms. Covalent bonds are generally characterized in two types, polar and non-polar covalent bonds. Electronegativity is a relative measure of…

Chemical bonding

Chemical bonds are what make up the world. In bonds, elements are held together and form compounds that may have new physical and chemical properties. There are two main kinds of bonds, they ionic and covalent. In bonding the goal of the atoms involved is to reach a level of stability with less energy. In order to reach the epitome of stability, as in the case of noble gases, an atom strives to complete its outer shell. Either losing or gaining electrons may do this, which concludes in an ionic bond or the sharing of electrons with other atoms which makes a covalent bond. Ionic bonds, as you can probably surmise form from ions. Ions are made when an atom…

How electrostatics influence our lives

INTRODUCTION We all are familiar with the term electricity which comes from batteries and which is used to light bulbs, buzzers, and other electrical devices. We also know that conductors are those objects which conduct electricity easily and insulators do not conduct electricity at all. This is basic knowledge but right now we are going into detail about electricity and static electricity. ELECTROSTATICS Many of us have this wrong concept in our mind that insulators like plastic and wood cannot carry charges at all. This is a wrong concept. The truth is that most insulators carry a special type of charge which conductors do not carry. The charge is created due to static electricity and is known as an electrostatic…

Factors affecting the resistance of a wire

Introduction: Resistance is a force, which opposes the flow of an electric current around a circuit. Resistance is measured in Ohms. George Ohm discovered that a circuit sometimes resists the flow of electricity. He called this ‘RESISTANCE.’ He even came up with a rule for working out the resistance of a circuit, which was: R= V ÷ I V- Volts I- Current R- Resistance Ohms law says the more resistance means more energy is needed for the current to pass through the wire. Resistance is a measure of how much energy is needed to push the current through something. Resistance occurs when the electrons travelling along the wire collide with the atoms of the wire. These collisions slow down the…

Investigating the rate of electrolysis

It is known that by passing a constant electric current through a copper sulphate solution the passage of ions through this solution results in copper atoms being dissolved into the solution from the anode, which has a positive charge while positive copper, ions (cations) are also being discharged at the cathode which has a negative charge. Normally anions, which have a negative charge, are discharged at the anode. The experiment I will be carrying out is aimed to observe the amount of Copper (Cu) metal deposited during the electrolysis of Copper Sulphate solution (CuSo4) using Copper electrodes, when certain variables are changed In this investigation I will change variables within the experiment, which will hopefully change the rate of reaction…

Dream Job Speech (physicist)

Hello my name is, today i will be talking about my dream job or my future job if i could say. my dream job is to be an physicist, an physicist is an expert in physics, and sometimes even dealing with living organisms. But there are many different types of physicist out there. there are Particle Physics, Astrophysics, Theoretical Physics, Mechanical Physics, Quantum Physics well known as (Quantum Mechanics) lastly there is Biophysics. But the type of physicist i want to be is to be an particle physicist. an particle physicist is a branch of physics dealing with the, properties, and interactions of elementary particles especially as revealed in experiments using particle accelerators —called also high-energy physics. The idea is…

Forensic Science

1. What is a comparison microscope? What are the advantages of this microscope? A comparison microscope combines two microscopes into one module. This helps the viewer see what is under each of the lenses at the same time. 2. What are the three substances that generally make up paint? Describe each part. The three substances that make up paint are pigments, binders, and a solvent. Pigments includes both organic and nonorganic compounds and materials that are added to the other two substances to create a certain color. Binders provide support for the pigment, and the solvent dissolves these substances into liquid form. 3. What are polymers? Polymers are substances made up of atoms with the atoms arranged in repeating patterns….

Cathode ray tube

I. OBJECTIVE An oscilloscope is the standard instrument that is used to examine time dependent voltages in a circuit. They are widely used in the medical professional to examine the electrical output of a heart, and in operating rooms. The voltage can be drawn on graph paper with the voltage on the vertical axis, and the time on the horizontal axis. Adjusting the scope will allow you to analyze part of one cycle or many cycles of the waveform. The objective of this lab is to become familiar with 2 types of oscilloscopes, the model 2530B made by BK Precision, and the Data Studio scope. II. DESCRIPTION The main part of an analogue scope is a cathode ray tube (CRT),…

Absorption of Nuclear Radiation

It was necessary to determine the operating voltage for the G-M counter. Group 7 put the beta source right underneath the sensor and started with a voltage of 200 V, then slowly added more and more voltage until the rate of electrons counted was constant. (This number was 257 V. To this number, 75 more volts were added for a voltage of 232 V. This was left as a constant for the remainder of the experiment. The background radiation was calculated next. This was done by removing the beta radiation and letting the sensor run for ten minutes to pick up what radiation different sources in the room would let off. The number was was 12.2 counts. This was divided…

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 above graph shows the decrease in atomic radii down a period, and the sudden jumps upward indicate the start of a new period, as a new shell is added. First Ionization Energy (kJ/mol) of the First 20 Elements: – Ionization energy increases when moving down a period, as more energy is required to take an electron from the element when it has a higher number…

An Apology Letter

The electron microscope was first created in 1933 and magnified up to a million times. First electron microscope was a transmission. It used electrons to recreate an image. Scanning electron microscope developed later, it uses a beam of particles to scan across specimen to recreate image of its surface. They are used for the viewing of biological and inorganic species. Electron microscope has higher resolution than light microscope allowing higher magnification. Light microscope has limited magnification as there is a physical limit imposed by photons. The stereomicroscope has low level of magnification, but gives 3-D view. Electron microscopes give a view of structures that would not normally be visible by optical microscopy. Bonus to light microscopes is that it is…

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- Worked with Ernest Rutherford, experimented with 38 metals, he found that the positive charge of each element’s nucleus increased by one from element to element as they were arranged in Mendeleev’s periodic table, lead to modern definition of atomic number (# of protons in atom’s nucleus) and the recognition the atomic number was basis for organization of periodic table. Describe the organization of the modern…