cheamical

What is an isotope?

• Atom that belongs to the same chemical element as another, has the same atomic number, but different atomic mass.

• Minor material portion of a chemical element that is involved in chemical reactions and possesses the characteristic properties of said element

• Definite and ordered grouping of atoms that constitutes the smallest portion of a pure substance and retains all its properties.

• It is the unit with which the amount of substance is measured, one of the seven fundamental physical quantities of the International System of Units.

What does the law of multiple proportions say?

• When two or more elements combine to form a given compound, the ratio of the masses of the elements involved is always the same

• Different atoms combine in simple whole number relationships to form compounds

• Explain that the amounts of the same element, which are united with a fixed amount of another element, form a different compound in each case

• The weights of the different elements that are combined with the same weight of a given element are the relative weights of those elements when combined with each other.

What is a redox reaction

• reactions that involve the transfer of electrons from one species to another.causing a change in their oxidation statescausing a change in their oxidation states

• reaction in which a substance reacts with oxygen gas, releasing energy in the form of light and heat.

• It is any thermodynamic process in which two or more chemical species or substances are transformed, change their molecular structure and their bonds

• chemical reaction or other process in which the products themselves promote or spread the reaction, which under certain conditions may accelerate dramatically.

what is a chemical bond

• type of linkage formed from the electrostatic attraction between oppositely charged ions in a chemical compound

• eminently electrostatic attractive force between an electronegative atom and a hydrogen atom

• Occurs in two non-metal atoms when they bond and share one or more bottom level electrons

• a strong force of attraction holding atoms together in a molecule or crystal, resulting from the sharing or transfer of electrons.

What elements make up organic compounds

• Combination of metal and non-metal elements on the periodic table.

• forming carbon-carbon and carbon-hydrogen bonds. In many cases they contain oxygen, nitrogen, sulfur, phosphorus, boron, halogens and others.

• They generally do not have carbon, and when they do, it is not a major element.

• Na, Cl, Mg, Cr,Ba, S, Fe

difference between adsorption and absorption

• Absorption refers to individual molecules, atoms or ions gathering on surfaces. Adsorption is where a liquid is soaked up into something like a sponge, cloth or filter paper. The liquid is completely absorbed into the absorbent material.

• Absorption is where a liquid is soaked up into something like a sponge, cloth or filter paper. The liquid is completely absorbed into the absorbent material. Adsorption refers to individual molecules, atoms or ions gathering on surfaces.

• Absorption is the process in which atoms, ions or molecules from a substance (it could be gas, liquid or dissolved solid) adhere to a surface of the adsorbent . Adsorption .is the process in which a fluid is dissolved by a liquid or a solid (absorbent).

• Absorption It is a surface phenomenon, Adsorption It is a bulk phenomenon

which of the following orbitals have the lowest energy

• 5p

• 4d

• 6s

• 4f

The type of bond present in BaBr2 is:

• Ionic

• Covalent

• nonpolar covalent

• metalic

It is the distance between the center of the nucleus of an atom and the electron. outermost:

• Atomic radius

• Atomic diameter

• Link length

• Ionic size

To the capacity of an element to attract electrons towards it in a chemical bond is called:

• Electron affinity

• Heat capacity

• Electronegativity

• Ionization potential