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19) a. Gaining electrons
b.
Neither
c.
Neither
d.
Losing electrons
e.
Losing electrons
20) a. H
b. Na–
c. Cl+
d. Al3–
21) a. Potassium iodine KI
b.
Calcium sulfate CaS
c. Iron
bromide FeBr3
d.
Barium hydroxide BaOH2
e.
Ammonium phosphate (NH4)3PO4
f.
Aluminum oxide Al2O3
22) The periodic table was created so
scientists can have all the elements in an arrangement in order of increasing
atomic number.
23) A bar graph should be used to represent
discontinuous data because it displays the different changes.
24) a. A data table helps you know what you
need to do before an investigation.
b. A
data table keeps all of your information organized during an investigation.
c. A
data table helps you see the different results of each element you used.
25) a. The ion cards helped me see the
different types of ions and the different melting and boiling points of ions.
b. The
ion cards are imperfect models of ions because it represents a possible atom.
26) A is more likely to occur
because calcium metal will combine better with compounds than chromium metals.
27) B is more likely to occur
because zinc is more reactive than silver.
28) a. If you stir a solution of lead (II)
nitrate with an iron spoon, the chemicals from the spoon would react with the
elements.
b. Pb2++ Fe –––> Pb + Fe2+
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