How do the three feathersma...

来源：蜘蛛抓取(WebSpider) 时间：2011-10-20 02:20 标签： the three feathers
The page is temporarily unavailable
nginx error!
The page you are looking for is temporarily unavailable.
Please try again later.
Website Administrator
Something has triggered an error on your
This is the default error page for
nginx that is distributed with
It is located
/usr/share/nginx/html/50x.html
You should customize this error page for your own
site or edit the error_page directive in
the nginx configuration file
/etc/nginx/nginx.conf.Auth with social network:
We think you have liked this presentation. If you wish to download it, please recommend it to your friends in any social system. Share buttons are a little bit lower. Thank you!
Presentation is loading. Please wait.
ATOMS. Objectives What is an atom and its three subatomic parts? What are the charges of the three subatomic parts? How do you find atomic mass and the.
Published by
Download presentation
Copy to clipboard
Presentation on theme: "ATOMS. Objectives What is an atom and its three subatomic parts? What are the charges of the three subatomic parts? How do you find atomic mass and the."— Presentation transcript:
Objectives What is an atom and its three subatomic parts? What are the charges of the three subatomic parts? How do you find atomic mass and the atomic number? Compound vs. element? What is an isotope?
How small is an atom? The basic unit of matter. the smallest unit. ‘unable to be cut’ Can it be seen? Is it living? 100 million atoms side by side is about the width of your pinkie!
What is an atom made of? 3 subatomic particles oProton oNeutron oElectron
Proton POSITIVE PROTON (+) Located inside the nucleus Has a positive charge and contributes to the mass Mass - 1. AMU
Neutrons NEUTRAL NEUTRON oLocated inside the nucleus oHas no charge but contributes to the mass oMass- 1. AMU
Electrons Negative Charge oOrbits around the nucleus and is in constant motion. oThey are attracted to the positive charged nucleus. oThere are the same amount of protons as electrons. oMass is too small to be included. oMass- 0. AMU o(1/1836 th the mass of a proton)
Periodic Table Element- pure substance containing only one type of atom. We distinguish the elements based on protons, neutrons, and electrons.
Compound A substance formed by the chemical combination of 2 or more elements. The physical and chemical properties of a compound and usually very different from the elements in which they are formed. Sodium is a soft metal + poisonous chlorine = sodium chloride + =
compounds 2 or more elements Water = salt (sodium chloride) =
Atom = smallest unit of an element Molecule = smallest unit of compound
What does it mean? Atomic number= # of protons = # of electrons Atomic Mass= # of protons + number of neutrons Atomic mass
Isotopes Isotopes are atoms of the same element with the same number of protons but different number of neutrons. Some isotopes can give off radiation Isotopes are identified by their atomic mass.
Isotopes Helium-5 Atomic Mass = Atomic number (protons) = Number of neutrons = Helium-6 Atomic Mass = Atomic number (protons) = Number of neutrons = Helium-7 Atomic Mass = Atomic number (protons) = Number of neutrons = Helium-8 Atomic Mass = Atomic number (protons) = Number of neutrons =
Bonds What is the difference between a covalent bond and an ionic bond? What is an ion? What are valence electrons?
Chemical bonds Ionic – electrons are transferred from one atom to the next. Covalent- electrons are shared between atoms
Ionic bonds Formed when one or more electrons are transferred and ions (charged atoms)are paired. What is the charge of an electron? When sodium looses an electron it has a positive charge. Opposite ions attract!
Valence electrons The electrons in one atom that are able to form bonds with another atom. The closer the atom is to having 8 valence electrons, the more stable it is. Where are the valence electrons?
Ionic Bonds Bonds between a metal and nonmetal.
Covalent Bond Electrons are shared between atoms. 1 bond is when atoms share 2 electrons Nonmetal with nonmetal Neither atom is strong enough to pull an electron away from the other so they share.
Can an atom be broken? /watch?v=xyY4c WKPrSc /watch?v=xyY4c WKPrSc
Water - 3,000,000,000,000,000,000,000 water molecules in a single drop of water!
Properties of water 1. Polarity 2. Hydrogen bonds 3. Cohesion 4. Adhesion /watch?v=ivu4nlv D_90
Hydrogen bonds The weak interaction between the slightly positive hydrogen and a negative atom (oxygen, fluorine, nitrogen)
Surface Tension
Ads by Google

我要回帖

更多关于 the three feathers 的文章

 

随机推荐