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Chemistry

Curiosities (page 3)

What are organic products? Why is our world colorful? Where does the odor from our perspiration come from? How did the IUPAC nomenclature come about? Salt Empire How important is iron in our body? Why do salads wither? Chemical Elements and Their Symbols in the Middle Ages Chemical Elements and the Stars
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Physics

Magnetic force on a conductive wire

Whenever a charge is put under the influence of a magnetic field, it undergoes an interaction that can alter its motion. If the magnetic field in question is uniform, we have seen that there will be a force acting on the load with intensity, where is the angle formed in the plane between the velocity vectors and the magnetic field.
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Chemistry

Exothermic reaction

It is a chemical reaction whose total energy (enthalpy) of its products is lower than that of its reagents. This means that it releases energy in the form of heat. Take the following example, where we calculate the enthalpy variation of a reaction. If the value is negative (-), the reaction is exothermic, ie it has lost energy to happen.
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Physics

Static and Hydrostatic Issues

Pressure (1) What is the pressure caused by a 12N force applied to a rectangular surface of dimensions 15cm x 5cm? Where: and the area of ​​the rectangle is given by multiplying its sides and converting the units to SI: (2) What is the pressure exerted by a 0.7kg / m³ density fluid that fills a 2m high cylindrical vessel?
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Chemistry

Colligative properties

What happens to the boiling point of water if we add table salt? Why does water boil faster in high altitude locations? Why is salt added on the roads in winter? These questions relate to the properties that compare the behavior of solutions with their pure solvent.
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Physics

Optics Fundamentals Issues

Shadow and Penumbra 1. A 1.9 m tall person is standing next to a building. The shadow of the building projected by sunlight is 90 m while the shadow of the person is 9 m. How tall is the building? We begin the problem by thinking about the sun's rays, since they must be parallel to each other. The person, shadow, and ray of light form a right-angled triangle just like the triangle formed by the building, shadow, and ray of light; the angles formed must be the same.
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