Do the properties of elements change when combined to form compounds?
The chemical properties of atoms are significantly changed when they form compounds.
When elements combine to form compounds it is called a chemical reaction.
The compound is then a collection of molecules and each molecule has in it atoms from the elements used in the formation.
The atoms in the molecule are still the same atoms as one started with, but the arrangement of the electrons in the atoms has changed. It is the electronic properties of atoms and molecules that really determine the properties they have and which chemical reactions occur and which do not.
The chemical properties of an atom or molecule are determined by the arrangement of the electrons of that atom or molecule. Once atoms have gone through a chemical reaction, the electronic structure is changed. The atoms are the same identity, but the properties of the atoms have been changed by the chemical reaction.
Almost all elements can be combined into compounds, for example water=h20 steel=iron and carbon. Their properties usually change. For example when carbon is added to iron to make steel, it becomes stronger and more durable. Humans use compounds to our advantage, adding various elements to materials to make them water proof, stronger, more flexible, harder e.g
MIXTURES Combination of two or more substances that are not chemically combined No new substance formed Do not exist in fixed proportions to each other They just mix Most natural substances are mixtures Can be physically separated into pure compounds or elements Can be separated by mechanical means Physical properties can change Any combination of solid, liquid or gas can be a simple mixture MIXTURES MAY BE HOMOGENEOUS OR HETEROGENEOUS COMPOUNDS A pure compound has…
Chemical properties of matter describes its "potential" to undergo some chemical change or reaction by virtue of its composition. What elements, electrons, and bonding are present to give the potential for chemical change. Chemical change results in one or more substances of entirely different composition from the original substances. The elements and/or compounds at the start of the reaction are rearranged into new product compounds or elements. A CHEMICAL CHANGE alters the composition of the…
How do the properties of the parts of a mixture compare to the properties of the parts before they become a mixture?
The chemical properties of atoms are significantly changed when they form compounds. When elements combine to form compounds it is called a chemical reaction. The compound is then a collection of molecules and each molecule has are still the same atoms as one started with, but the arrangement of the electrons in the atoms has changed.
When repeating chemical and physical properties of elements change periodically with the elements atomic numbers it is called the?
It is a chemical change: the original compound was actually a different substance, not merely a mixture of the elements. This is a type of "decomposition" chemical reaction. *Note that "alloys" of metals are mixtures, not compounds, because although they display altered properties, they can be separated by physical means (smelting).
a compound has an exact formula and the elements have changed their properties a mixture has no exact formula and no exact structure (the molecule) in which the atoms have combined to change their properties. Ex. Nitrogen and oxygen in the air are a mixture of elements. But dinitrogen pentoxide is a compound of exactly 2 nitrogen for every 5 oxygen atoms. You should not breathe it because it combines with water in your body…
What are some properties of vegetables that change if properties change why is salad called mixture?
vegetables if combined correctly and with enough heat and dihydrogen oxide (and sometimes a sprinkle of crystallised sodium chloride); produce a large variety of edible mixtures which as a general rule have high viscosities. hence it is called a mixture as this viscous liquid is often mixed to equally distribute constituent elements.