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Physics

Flat mirror

A flat mirror is one in which the reflection surface is completely flat. Flat mirrors have a wide range of uses, from home to mirror as components of sophisticated optical instruments. A flat mirror is represented by: The main properties of a flat mirror are the symmetry between the object and image points and that most of the reflection that happens is regular.
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Chemistry

Chemistry exercises

In this section you will find several chemistry exercises, all with the answers. Click below on the chosen content and good studies! Chemical Kinetics Chemical Functions, Indicators, pH and Modern Theories
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Chemistry

How to make water not freeze?

In countries where the weather is very cold, it is common to add special additives to car radiators to prevent water freezing. Using one of the knowledge of colligative properties, cryoscopy, it is customary to add ethylene glycol to the radiator water. This causes the freezing temperature to decrease and causes the boiling temperature to increase.
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Chemistry

Chemistry exercises

Chemical Functions, Indicators, pH and Modern Theories Here are our solved exercises on this content. To see the answers, just click the button next to each question. 1. What are acid-base indicators? 2. What are the best known acid-base indicators? 3. What color does phenolphthalein assume when it comes in contact with an acid?
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Chemistry

Hydrocarbons (continued)

Aromatics (continued) Nomenclature To name aromatics containing only one aromatic ring plus the alkyl group, we must number the ring starting with the simplest radical. Then put in alphabetical order. The prefixes di, tri, tetra do not enter alphabetical order. ethylbenzene 2-ethyl-1-methylbenzene For two branches we use the ortho (o), meta (m) and para (p) radicals.
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Physics

Circular motion

Uniformly Varied Circular Motion When a body, which describes a circular path, undergoes a change in its angular velocity, then this body has angular acceleration (α). The angular forms of the Uniformly Varied Curvilinear Motion equations are obtained when divided by the radius R of the trajectory to which the body moves.
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