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1.Defenition of matter
Matter is everything around you. Atoms and molecules are all composed of matter. Matter can be classified into two categories: pure substances and mixtures.A sample of matter can be a gas, a liquid, or a solid.
"Phase of matter"
ATOMS
atom is the smallest constituent unit of ordinary matter that has the properties of a chemical element. Atoms are very small; typical sizes are around 100 picometers (a ten-billionth of a meter, in the short scale).
MOLECULES
The molecule is a group of atoms (at least two) that are bonded together very strongly (covalently) in a particular arrangement and are neutral and fairly stable
B.PURE SUBTANCES
A substance is simply matter with definite chemical composition and distinct properties. It is matter that is characterized by a constant composition in terms of its molecules, formulae and atoms, as well as physical properties such as density, refractive index, electric conductivity, melting point, and so on.
A substance can be an element or a compound but NOT a mixture. It can also be matter that exists in its pure form, usually called a pure substance. A few examples of substances include Water , Hydrogen and Neon (Ne).
1. ELEMENTS
An element is a substance made from only one type of atom. For example, Oxygen () is an element made up of ONLY oxygen atoms. To understand this better, let us see the how atoms behave.
Every element is made up of atoms. Atoms are the smallest piece that can exist in an element. You will need to put millions of atoms together to get an element of about half millimeter in size. An atom is made up of ‘Electrons, Protons and Neutrons’.
2. COMPOUND
A compound is a substance made from two or more elements that have reacted chemically with each other. The elements in the compound can NOT be separated by physical means.
Let us see this example below:
Note that there are so many ways that molecules of elements join together, forming millions of compounds. All compounds are molecules but not all molecules are compounds.
C. MIXTURE
A mixture is formed of little bits of one or more substances mixed together. Usually, the parts can be separated from each other by physical means, because it does not involve any chemical reactions or bonds. A mixture is made when two or more substances are combined, but they are not combined chemically.
"General properties of a mixture:"
1. The components of a mixture can be easily separated
2. The components each keep their original properties
3. The proportion of the components is variable
Reference
* http://www.eschooltoday.com/science/elements-mixtures-compounds/what-is-a-compound.html
*https://chem.libretexts.org/Core/Analytical_Chemistry/Qualitative_Analysis/Classification_of_Matter
*http://www.ducksters.com/science/chemistry/chemical_mixtures.php
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CLASSIFICATION OF MATTER
1.Defenition of matter
Matter is everything around you. Atoms and molecules are all composed of matter. Matter can be classified into two categories: pure substances and mixtures.A sample of matter can be a gas, a liquid, or a solid.
"Phase of matter"
ATOMS
atom is the smallest constituent unit of ordinary matter that has the properties of a chemical element. Atoms are very small; typical sizes are around 100 picometers (a ten-billionth of a meter, in the short scale).
MOLECULES
The molecule is a group of atoms (at least two) that are bonded together very strongly (covalently) in a particular arrangement and are neutral and fairly stable
B.PURE SUBTANCES
A substance is simply matter with definite chemical composition and distinct properties. It is matter that is characterized by a constant composition in terms of its molecules, formulae and atoms, as well as physical properties such as density, refractive index, electric conductivity, melting point, and so on.
A substance can be an element or a compound but NOT a mixture. It can also be matter that exists in its pure form, usually called a pure substance. A few examples of substances include Water , Hydrogen and Neon (Ne).
1. ELEMENTS
An element is a substance made from only one type of atom. For example, Oxygen () is an element made up of ONLY oxygen atoms. To understand this better, let us see the how atoms behave.
Every element is made up of atoms. Atoms are the smallest piece that can exist in an element. You will need to put millions of atoms together to get an element of about half millimeter in size. An atom is made up of ‘Electrons, Protons and Neutrons’.
2. COMPOUND
A compound is a substance made from two or more elements that have reacted chemically with each other. The elements in the compound can NOT be separated by physical means.
Let us see this example below:
Water is a compound. It is written as . This means it is a chemical bond of two elements—Hydrogen and Oxygen. It is written as because there are two atoms of Hydrogen, making it a hydrogen molecule, bonding with one atom of Oxygen.
Note that there are so many ways that molecules of elements join together, forming millions of compounds. All compounds are molecules but not all molecules are compounds.
C. MIXTURE
A mixture is formed of little bits of one or more substances mixed together. Usually, the parts can be separated from each other by physical means, because it does not involve any chemical reactions or bonds. A mixture is made when two or more substances are combined, but they are not combined chemically.
"General properties of a mixture:"
1. The components of a mixture can be easily separated
2. The components each keep their original properties
3. The proportion of the components is variable
Reference
* http://www.eschooltoday.com/science/elements-mixtures-compounds/what-is-a-compound.html
*https://chem.libretexts.org/Core/Analytical_Chemistry/Qualitative_Analysis/Classification_of_Matter
*http://www.ducksters.com/science/chemistry/chemical_mixtures.php
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Please describe the specific characteristics
BalasHapusof heterogeneous and homogeneous.
hroughout the mixture. The composition of the mixture is the same throughout.
HapusA heterogeneous mixture is a mixture where the components of the mixture are not uniform or have localized regions with different properties.
Hi Demi
BalasHapusHow do to distinguish spesific molecules and coumpounds and help exemplify?
Thank You
Komentar ini telah dihapus oleh pengarang.
HapusA molecule is formed when two or more atoms join together chemically. A compound is a molecule that contains at least two different elements. All compounds are molecules but not all molecules are compounds. molecule is formed when two or more atoms join together chemically. A compound is a molecule that contains at least two different elements. All compounds are molecules but not all molecules are compounds.
Hapusaccording from your article, can you explain why Hydrogen and Neon (Ne)included in the pure substances ? please give a reason!
BalasHapusA pure substance has a definite and constant composition — like salt or sugar. A pure substance can be either an element or a compound, but the composition of a pure substance doesn’t vary.
HapusHow we can to identification some things are classific into compound or mixture just look at the physic of thing ?
BalasHapusWe can see their defenition ,and we can see prom different about them.
HapusAsalamualaikum dem , please you explain about all compounds are molecules ?
BalasHapusAll compounds are molecules because a molecule is 2 or more substances/elements combined and a compound is 2 or more elements combined. But not all molecules are elements because some molecules are just combined substances with no elements combined at all.
HapusHi demiati here i am still a little confused about the naming of a compound. Can you help me by explaining how the compound naming rules
BalasHapusThx
Example :
Hapuspotassium oxide : K+1 and O-2 give K2O
aluminum bromide Al+3 and Br-1 yield AlBr3.
BalasHapusdo you think how different homogeneous and heterogeneous mixtures?
The difference between heterogeneous and homogeneous mixtures is the degree at which the materials are mixed together and the uniformity of their composition.
Hapuscould you explain to me how to make a solid solution, a liquid solution and gas solution ?
BalasHapusFor solid solution ,The mixing can be accomplished by combining the two solids when they have been melted into liquids at high temperatures and then cooling the result to form the new solid or by depositing vapours of the starting materials onto substrates to form thin films.
HapusHow to make solution in a general :
1.Define a percent by weight/volume solution.
2 Identify the volume of solution you want to make. I
3.Calculate the number of grams needed to make the solution.
4.Weigh out the mass of the compound.
5.Dilute the compound in the necessary amount of solvents.
I hope you understand😁
hello demi, do you think about, how the preservation process using organometallic compounds dietilzink book?
BalasHapusOrganometallic chemistry is the study of chemical compounds containing at least one bond between a carbon atom of an organic compound and a metal, including alkaline, alkaline earth, transition metal, and other cases.[
HapusHi Demi, please explain to me spessifically different about pure substances and mixtures, and give me example ? thanks dem.
BalasHapusThanks for question ,
HapusA pure substance has a definite and constant composition — like salt or sugar. A pure substance can be either an element or a compound, but the composition of a pure substance doesn’t vary.
Mixtures are physical combinations of pure substances that have no definite or constant composition — the composition of a mixture varies according to who prepares the mixture.For example, suppose you have a mixture of salt and sand, and you want to purify the sand by removing the salt. You can do this by adding water, dissolving the salt, and then filtering the mixture. You then end up with pure sand.
1 hope you understand
Assalamualaikum Wr. Wb. Demi.
BalasHapusMay you fix between oil and water or solution in daily home?
,yes of course,i may do that
HapusWhat is pure subtances? And tell me what the contrast between pure subtances and pure matter
BalasHapusA pure substance is a sample of matter with both definite and constant composition with distinct chemical properties.
HapusAlternate Spellings: chemical substance
What are the differences between polar and nonpolar compounds?
BalasHapusPolar solvents have large dipole moments (aka “partial charges”); they contain bonds between atoms with very different electronegativities, such as oxygen and hydrogen.
HapusNon polar solvents contain bonds between atoms with similar electronegativities, such as carbon and hydrogen (think hydrocarbons, such as gasoline
Demi, I am curous about this "A substanse can be an element or a compound but NOT a mixture" in your 'pure substanse' paragraph. Could you explain to me the reason why?
BalasHapusAnother useful term is the word "substance", which can be used to refer to either an element or a compound - but not to a mixture because a "substance" always has a definite composition. The most general term is "matter" which can be used to refer to any of "substances", "elements", "mixtures" or "compounds".
BalasHapus