THE TUNGSTEN

THE TUNGSTEN

It is the chemical element with symbol W and atomic number 74.

It is a rare metal in the earth's crust, it is in the form of oxide and salts in certain minerals. It is gray, very hard and tense and has the highest melting point of all metals and the highest boiling point of all known chemical elements, which are: Melting: 3422 degrees celsius Boiling: 5930 degrees Celsius

Tungsten is the heaviest element used by living things

Tungsten and its most popular alloy, tungsten carbide are both excellent neutron reflectors, tungsten crystals are so compressed that they turn out to be effective shields against radiation of any kind.

Approximately half of the tungsten is consumed for the production of hard materials 

In its pure state it is used in the manufacture of filaments for electric lamps, resistors for electric ovens etc.

Tungsten, usually alloyed with nickel and iron or cobalt to form heavy alloys, is used in kinetic energy penetrators.

TYPES OF ENERGY

Mechanical energy: Energy that bodies posses because they move at a certain speed (Kinetic energy) or because they are displaced from their position of equilibrium (potential energy).

Electrical energy: Energy generated by the movement of electric charges.

Chemical energy: Energy that is released or absorbed in chemical reactions.

Electromagnetic energy: Energy transported by electromagnetic waves.

Thermal energy: Energy caused by the movement of the atoms or molecules in a body.

Internal energy: Energy that includes all the forms of energy that exist inside a body.

Nuclear energy: Energy released during processes of nuclear fission or nuclear fusion,

LABORATORY MATERIALS

Digital scale: Báscula digital

Beaker: Vaso de precipitado

Glass rod: Vara de cristal

Flask: Matraz

Funnel: Embudo

Dropper: Cuentagotas

Magnetic Fastener: Cremallera magnética

Condenser: Condensador

Thermometer: Termómetro

RIDDLE ABOUT PHYSICS AND CHEMISTRY

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MAKING ATOMS

Nucleus:

Protons: They are particles with a positive charge that with neutrons they form the nucleus of the atom

Neutrons: They form the nucleus with protons. They don't have charge. James Chadwick discovered them.

Shells:

Electrons:  They are in the shells of the atoms. They have a negative charge.  J.J. Thompson discovered them.

HOW TO CALCULATE THE DENSITY OF A PRISM

Materials:

1.     Prism figure

2.     Scale

3.     Ruler

Procedure

With the scale we measure the mass of the prism.

With the ruler we measure the length, width amd height of the figure.

After measuring we multiply the length by width by height to calculate de volume

Finally we measure the density dividing mass by volume.

Analysis of the results

Mass: 200g

Volume: W · L · H = 2 · 2 · 7 = 28 cm³

Density: 200 : 28 =7,14 cm³ = 7,1 · 1000 Kg/m³

7,1 g/cm3 = 7,1 · 1000 Kg/cm³              

PHYSICS AND CHEMISTRY GLOSSARY UNIT 1

Abstract:A brief explanation in a few sentences of what you have researches and the main conclusions that you drew.

Accuracy:Of a tool is the smallest value it is capable of mesuring.

Accurate (adj):Close to the true value.

Article: A piece of writing in a magazine, newspaper, etc.

Drawing conclusions: Deciding on something after thinking about all information connected to it.

Hypothesis ( Hypotheses,pl): A suggested explanation for something that has not yet been proved to be true.

Margin of error: The amount by wich a measure can be wrong but still is a good value..

Point of the graph: Each pair of related values that we represent on the graph.

Socket: The place on a wall where you connect electrical equipment to the elctrical supply.

Report: Description of an event or situation or scientific work.

Variable: Each of the factors choose in your hypothesis.

Indeoendent variable: Variable whose value does not depend on another variable.

Dependent variable: Variable whose value depends on what we have set as the independent variable.