GROUP BLUE BLOCK 1 CHAPTER 8: CHEMICAL REACTIONS AND PHYSICAL CHANGES.

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Presentation transcript:

GROUP BLUE BLOCK 1 CHAPTER 8: CHEMICAL REACTIONS AND PHYSICAL CHANGES

OBJECTIVES Compare chemical reactions to physical changes Compare parts of an atom Calculate the mass of one mole of an element or compound Explain how ionic and covalent bonds are formed Identify the parts of chemical equations Distinguish between reversible and irreversible reactions and changes

VOCAB Chemical reaction : the change of substances into other substances Example: A candle’s wick catching fire Video: Physical change : an alteration of a substance that does not change its chemical composition Example: Melting wax on a candle Atomic number : the number of protons in an atom Neutron : an uncharged atomic particle Nucleus : the dense core of an atom Video: Protons : particle with a positive electrical charge

CONT. Electron : negatively charged particle that moves around the nucleus Mass number : total protons and neutrons in an atom’s nucleus Atomic mass : the average mass of a sample of atoms of that element found in nature Periodic table : chart that arranges elements by atomic number into rows and columns according to similarities in their properties

MASS NUMBER

CONT. Mole : the unit of measure used to count molecules or atoms Equation: 6.02 * 10^23 Chemical bonds : the forces that hold atoms together Ions : charged particles Ionic bond : the bond formed by the transfer of electrons between atoms Example: one metal and one nonmetal bonding Ionic compounds : compounds that result when metals and non-metals bond ionically with each other Covalent bond : atoms share electrons with each other Example: two nonmetals bonding

CONT. Chemical equation : written description of a chemical reaction using symbols and formulas Reactants : the elements or compounds present at the start of a reaction Products : the elements or compounds formed during the reaction Covalent compounds : compounds formed by the sharing of electrons

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