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Chemical Compounds. DO NOW. Label the atom- proton , neutron , electron , nucleus . Label charges where they belong. (+) (-). Elements. A pure substance that consists of just one type of atom Classified by the number of protons/electrons. Elements.
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DO NOW Label the atom- proton, neutron, electron, nucleus. Label charges where they belong. (+) (-)
Elements • A pure substance that consists of just one type of atom • Classified by the number of protons/electrons
Elements • A pure substance that consists of just one type of atom • Classified by the number of protons/electrons • REMEMER– the number of PROTONS is EQUAL to the number of electrons!!
“atomic number” = How many protons/electrons a Boron atom has
Elements • A pure substance that consists of just one type of atom • Classified by the number of protons/electrons • REMEMER– the number of PROTONS is EQUAL to the number of electrons!! • Atoms have NO CHARGE… NEUTRAL
How to solve a challenge question • “I see that……” • “I know that…..” • “I think that…….”
Chemical Compounds • 2 or more elements combined
Chemical Compounds • 2 or more elements combined • Example- H2O
Chemical Compounds • 2 or more elements combined • Example- H2O • Hydrogen Hydrogen Oxygen
Chemical Compounds • 2 or more elements combined • Example- H2O • Hydrogen Hydrogen Oxygen • Elements “combine” to one another by chemical bonding
Chemical Bonding • When 2 or more elements bond together, the result is often very different than the original elements • Bond- join, combine, or come together • Original- what you started with
Chemical Bonding • Elements bond together, or combine/join with other elements by stealing or sharing electrons from other elements. • Chemical bonds happen because of electrons
Ionic Bonding • Elements take or give away electrons
Covalent Bonding • Elements share electrons
1 2 7 6 3 5 4 Sodium Chlorine
1 2 7 6 3 5 4 Sodium Chlorine
1 2 7 6 3 5 4 Sodium Chlorine
IONIC BONDING- stealing and giving away electrons 1 2 7 6 3 5 4 Sodium Chlorine
CHALLENGE What do you think the charge of the sodium atom and the charge of the chlorine atom is Now that they are bonded? Why?
CHALLENGE What do you think the charge of the sodium atom and the charge of the chlorine atom is now? Why?
REVIEW • What is an atom? • What are the 3 subatomic particles? • What is the overall charge of an atom, and why?
Review • What is an element? • What does the “atomic” number tell us? • What are some examples of elements?
Review • What is a chemical compound? • How do chemical compounds form?
REVIEW • How does chemical bonding happen? (what does it involve?) • What are the 2 types of chemical bonds we have learned about?
REVIEW • Someone explain ionic bonding. • Some explain covalent bonding!