Guided Reading Chapter 17 Sec ons 1 and 2
1.Physical and chemical changes involve ______________.
2.A chemical reac on is the process of breaking molecular bonds and reforming them into a
new ________________.
a.atom
b) substance
c) element
1.List a few ways that would lead you to believe a chemical reac on had occurred.
1.What are reactants and products in a chemical reac on?
1.Complete the following table:
Symbol
Meaning
(s)
Substance is a liquid
(g)
Substance is dissolved in
a solu on
1.The statement, “the total mass of the products must equal the total mass of the
reactants” is known as the __________________________________________.
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2.The _____________ mass is the sum of the atomic mass units of all the atoms in a
chemical formula.
a.formula
b) isotope
1.A mole of any substance is equal to
a.6.02 X 1022 b) 6.02 X 10-23 c) 6.02 X 1023
1.
c) molar
2.Why is it useful to write chemical equa ons?
1.When balancing a chemical equa on you may only change the ________________, not
the subscript.
2.Can you balance this equa on using the rules on page 394–395?
_____Ca + _____O2
_____CaO
1.Can you balance this equa on using the rules on page 394-395?
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_____Na2O + _____H2O
_______NaOH