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Chemistry

Metal lumps

1.5 trillion tons of metal nodules (cobalt, copper, manganese and nickel) are estimated to exist in the Pacific Ocean soil, covering their deepest regions, according to Walter Sulivan's article in “N.Y. Times. ”Although lumps have been found at the bottom of Lake Michigan, they first appear in saltwater and in very deep places, about six to eight kilometers.
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Physics

Sound Tubes (continued)

Closed tubes Considering a sound pipe of length ℓ whose waves propagate at a velocity v. Thus the possible configurations of standing waves are: The ways of vibration can, from these examples, be generalized as: And the frequency of harmonics will be given by: In a closed tube, only natural frequencies of the odd harmonics are obtained.
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Chemistry

Contents of contents

Click on the desired subject name to view its content. WATER Water on the Planet Earth Physical States Water Cycle Separation of Principal Components Types Water as Solvent Density and Buoyancy Pressure Water and Life Water Treatment Diseases AR Atmosphere Air Composition Combustion Air Properties Weather Forecasting ENVIRONMENT PRESERVATION Preserving the Aquatic Environment Preserving Atmospheric Air Preserving Environments Exploring the Environment Basic Sanitation Public Health UNITS OF MEASURES Physical Quantities International System CONSTITUTION Atom Ion Isotopes, Isobars and Isotones Atomic Mass Periodic Table MATERIAL AND ENERGY Substance Object and Substance Chemicals and Physics Properties of Matter Energy Types CHEMICAL CONNECTIONS Noble Gas Stability Ionic Bonding Covalent Bonding Metallic Bonding OCTET THEORY Polarity of Molecules Molecules Polarity INTERMOLECU LINKS HOME INTERMOLECULAR INTERACTIONS Hydrogen Bridges Dipole-Dipole London Forces MOLECULAR GEOMETRY Linear Angular Trigonal Planar Pyramidal Tetrahedral SUBSTANCE CHEMICAL SUBSTANCE Classification Phase Shift and Graph Allotropy MIXTURES Substance and Mixture Equation Quasi-Equation Quasi-Chemistry Types of Chemical Reactions Lavoisier's Law Proust's Law RADIOACTIVITY Radiation Disintegration Decay and Half-Life Effects on Organisms INTRODUCTION TO STUDY What is Chemistry Matter and Substance Physical States of Matter Allotropy Separation of Mixtures ATOMIC MODELS Dalton Thompson Boutford Schrödinger Broglie Principle of Uncertainty
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Chemistry

Units of measure

Matter, being a body or a substance, and energy can be quantitatively evaluated. Each characteristic that can be quantified constitutes a physical quantity. Physical quantity Length, mass, temperature, time, volume, force, amount of matter, etc. These quantities are evaluated by the units of measure adopted by convention and each unit has its symbol.
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Physics

Resistors Association

In a circuit it is possible to organize interconnected resistor sets, called resistor association. The behavior of this association varies according to the connection between the resistors, and its possible types: series, parallel and mixed. Series Linking Linking resistors in series means connecting them in a single path, ie: Since there is only one way for the current to pass through it, it is maintained for the entire length of the circuit.
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Physics

Velocity

Instant Speed ​​Knowing the concept of average speed, you might ask yourself, “But does the car need to drive the entire course at a speed of 60km / h?” The answer is no, because average speed averages speed during the ride ( although not a weighted average, such as the averages of a test).
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