In the periodic table there are several ways to organize it but when you look at it it's organized by groups ( Metals, Metalloids, nonmetals). It's also organized by atomic mass and number. If an atom is in the same group then they will have the same number of valence electrons.
Atoms and ions are two totally different things.
Atom- The object or element is neutral
Ion- The object or element has a positive or negative charge.
Atoms and ions of the same element have the same atomic number or number of protons. But the ions will have different numbers of valence electrons. When an element is a metal it losses electrons so it will have a positive charge. When an element is a nonmetal it will gain electrons so it will have a negative charge. That's exactly how ions are formed, whenever ions are gained or lost because then the atom will have a charge.
That's how ions and atoms are different.
Saturday, November 13, 2010
Lab1-4 Physial & Chemical Change
Physical and chemical change can be easily mixed up. For instance, when a substance changes colors after something is added. Some people would think that it's a chemical change but it's only physical because it just changed the color it didn't change the chemical compositon of the substance
Physical Change- Any process involving a substance's change from one state (gas, liquid, solid) to another without alteration of the chemical composition. ( Dictionay.com)
Ex.) Freezing water is a physical change because both water and ice are H2O.
Chemical Change- Any change from one state (gas, liquid, solid) which is accompanied by alteration of the chemical composition; any process in which one or more substances are changed into one or more different substances. ( Dictonary.com)
Ex.) Making water out of hydrogen and oxygen
One thing that would convince methat a physical change has occurred is color change.
One thing that would convince me that a chemicalchange has occurrred is the bubbling or boiling of a substance.
When you're unsure you could use your reference tables or th internet to see if the two substances ar reactant to eachother.
Or
You could try to seperate the ixture and then see if it's different tan before.
Physical Change- Any process involving a substance's change from one state (gas, liquid, solid) to another without alteration of the chemical composition. ( Dictionay.com)
Ex.) Freezing water is a physical change because both water and ice are H2O.
Chemical Change- Any change from one state (gas, liquid, solid) which is accompanied by alteration of the chemical composition; any process in which one or more substances are changed into one or more different substances. ( Dictonary.com)
Ex.) Making water out of hydrogen and oxygen
One thing that would convince methat a physical change has occurred is color change.
One thing that would convince me that a chemicalchange has occurrred is the bubbling or boiling of a substance.
When you're unsure you could use your reference tables or th internet to see if the two substances ar reactant to eachother.
Or
You could try to seperate the ixture and then see if it's different tan before.
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