Answer Key

Periodic Table

* 1      Outer electrons are farther away from the nucleus in atoms farther down the family

 

 

 

 

 

 

 

 

 

 

 

 

 

* 2      He developed the periodic table.  Elements were in order of increasing atomic number and elements with similar properties were grouped together.

 

 

 

 

 

 

 

 

 

 

 

 

* 3      Cupric oxalate and Copper(II) oxalate

 

 

 

 

 

 

 

 

 

 

 

 

 

 

* 4      (NH4)2SO3

 

 

 

 

 

 

 

 

 

 

 

 

 

 

* 5      Li – small (3+:2-) F – large (9+:10-)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

* 6      Alkaline earth metals, +2 because they have 2 valence electrons that are easily lost.

 

 

 

 

 

 

 

 

 

 

 

 

 

* 7      They are found on the left of the periodic table.  They are good conductors of heat and electricity, they are ductile (can be drawn into wire) and malleable (hammered into thin sheets, and they have a metallic luster.

 

 

 

 

 

 

 

 

 

 

 

Balancing Act

* 1      CaBr2 + I2 ® CaI2 + Br2

 

 

 

 

 

 

 

 

 

 

 

 

 

 

* 2      3CuSO4 + 2Al ® Al2(SO4)3 + 3Cu

 

 

 

 

 

 

 

 

 

 

 

 

 

 

* 3      Double replacement

 

 

 

 

 

 

 

 

 

 

 

 

 

 

* 4      A homogenous solution of sodium chloride in water. NaCl(aq) ® Na+(aq) = Cl-(aq)

 

 

 

 

 

 

 

 

 

 

 

 

 

* 5      yes, sodium is further down the series than Lithium

 

 

 

 

 

 

 

 

 

 

 

 

 

 

* 6      6CaO + P4O10 ® 2Ca3(PO4)2

 

 

 

 

 

 

 

 

 

 

 

 

 

 

* 7      34 g water, hydrogen in excess

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Action Reaction

* 1      Sodium metal reacting with water

 

 

 

 

 

 

 

 

 

 

 

 

 

 

* 2      Bunsen burner

 

 

 

 

 

 

 

 

 

 

 

 

 

 

* 3      Noble gases

 

 

 

 

 

 

 

 

 

 

 

 

 

 

* 4      Science safety rules: Tie long hair back, no fooling around, no eating/drinking, etc…

 

 

 

 

 

 

 

 

 

 

 

 

 

* 5      Oxygen

 

 

 

 

 

 

 

 

 

 

 

 

 

 

* 6      1 ml = 1 cm3

 

 

 

 

 

 

 

 

 

 

 

 

 

 

* 7      Density

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Factoid Factory

* 1      2.41 x 1024 atoms of oxygen

 

 

 

 

 

 

 

 

 

 

 

 

 

 

* 2      In exothermic reactions the products have less energy than the reactants because the reaction releases energy.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

* 3      45 neutrons

 

 

 

 

 

 

 

 

 

 

 

 

 

 

* 4     

 

 

 

 

 

 

 

 

 

 

 

 

 

 

* 5      Homogeneous:  uniform throughout.

         Heterogeneous: not uniformly dispersed.

 

 

 

 

 

 

 

 

 

 

 

 

 

* 6      11% water

 

 

 

 

 

 

 

 

 

 

 

 

 

 

* 7      FeF3