Category: Sciences

Matter and energy

Matter and energy are part of the Universe: matter gives it structure while energy provides the capacity for change . When the Universe originated, everything was concentrated energy. As it expanded and cooled, matter was formed from energy. An easy way to understand what is matter and what is energy is the following: a fruit and a table are matter; the

Atoms and molecules

The atom is the basic unit of matter. The molecule is the result of the union of two or more atoms, that is, molecules are made up of atoms. Difference Atoms Molecules Definition The basic unit of matter Two or more atoms linked by a bond Composition Neutrons, protons, electrons Same or different atoms Chemical links Absent Here I’m Examples

Characteristics of acids and bases

The characteristics of acids and bases are all those properties and qualities with which we can distinguish between an acid and a base. According to Arrehnius theory, an acid is a substance that releases H + protons when dissolved in water, and a base is any substance that releases OH – hydroxyl ions when in aqueous solution. Acids Bases Ion formation Here I’m Here I’m

States of matter and properties of matter

Are states of matter specific patterns in which the constituents of matter are grouped. The properties of matter , on the other hand, are the set of qualities that matter presents and that characterizes it. Matter is defined as that which has mass, occupies space and is composed of atoms and molecules, which are, in turn, matter. States of the

Endothermic and exothermic reaction

An endothermic reaction requires energy while an exothermic reaction releases energy. This classification of chemical reactions takes into account the participation of energy either as a reactant or as a product. Energy is the ability to do work or to produce heat. Remember that chemical reactions involve a rearrangement of atoms between substances with breakage or formation of chemical bonds. In general,

Open system, closed system and isolated system

Thermodynamic systems are classified as open, closed, or isolated. The open system is one where energy and matter can enter or leave the system. The closed system is one where there is only energy transfer. The isolated system allows neither the entry nor the exit of energy or matter. In thermodynamics, a system is the part or portion of the Universe that is being studied. The system

Types of chemical bonds

Chemical bonds are the forces that hold atoms together to form molecules. There are three types of bonds between atoms: Metallic bond. Ionic bond. Covalent bond: nonpolar, polar, simple, double, triple, dative. Thanks to these bonds, all the compounds that exist in nature are formed. There are also forces that hold molecules together, known as intermolecular bonds, such as:

Strong and weak acids and bases

A classification of acids and bases in chemistry depends on the ionization force of these substances in aqueous medium. A) Yes: an acid and a base are strong when they are completely ionized, that is, in the ionization process they are completely transformed into cations or positive ions and into anions or negative ions. On the other hand, an

Camel and dromedary

The camel and the dromedary are mammalian animals belonging to the order Artiodactyla or ungulates with even fingers, that is, with hooves. The two animals are two different species of the same genus : Camelus dromedarius : it is the dromedary with a hump; Camelus bactrianus : it is the two-humped camel. Both the camel and the dromedary have been

Twins and twins

The difference between Twins and Twins is that Twins (Identical Twins) are originated from the same ovum and sperm and Twins (Fraternal Twins) are originated from different ovules and sperm . Twins Twins Designation Identical twins Fraternal Cufflinks Gynecological term Monozygotic twins Dizygotic twins Fertilization A single egg and a single sperm Two fertilized eggs with two sperm ADN Twins share the exact