Name: ______

Unit 2 Section A Review -Chemical Properties and the Periodic Table

1.  Identify each chemical and physical property of calcium that is described in the following paragraph.

Calcium is a (1) shiny, (2) silvery-white metal. (3)When it is exposed to moist air, it readily tarnishes. (4) At room temperature, calcium exists in the solid state and (5) its melting point is 842 °C. (6) It reacts with acid and with water to yield hydrogen gas.

Chemical Properties:

Physical Properties:

2.  Analyze the following data and classify each substance as a metal, nonmetal, or metalloid.

Element / Malleable or Brittle/Color? / Shiny or Dull? / Conductor? / Reacts with Acid? / Metal, Nonmetal, or Metalloid?
A / brittle/yellow / dull / yes / no
B / malleable/silver / shiny / yes / yes
C / brittle/grey / dull / no / no
D / brittle/black / dull / yes / no
E / malleable/grey / shiny / yes / yes

3.  Name the family to which each element belongs:

a.  K ______

b.  Kr______

c.  I______

4. The melting point of Fluorine is –219 °C while that of bromine is –7.3 °C. Estimate the

melting point of chlorine. Show how you arrived at your estimation.

5. Given a periodic table and the formulas Na2O and Ca3P2, predict the formula for a compound containing:

a.  Li and S ______b. Mg and N______

6. Complete the following table. Assume substance is electrically neutral unless otherwise indicated.

Element / Symbol / Atomic Number / Number of Protons / Number of Neutrons / Number of
Electrons / Mass Number
Ne - 20
6 / 8
7 / 14
Na+1 / 23
30 / 36 / 28
10 / 10 / 21

7. Which elements above are isotopes of each other? What is the difference between the two

isotopes?

8. Which elements in the table above are ions? How did you know they were ions?

9. An atom of element X has 6 protons and 6 neutrons. Is an atom that has 6 protons and 10 neutrons an isotope of element X? Explain.

10. Identify the element that is described by each of the following statements:

a. This element is a metal. It forms a cation. It is in the alkali metals group and in the same period as the metals used in a penny.

b.  This element is a metalloid. It is in the same period as the element found in cans used for soft drinks and other food items.

c.  This element is a Noble gas in period 5.

d.  This element is in group 2 and period 6.

e.  This element forms a cation and is in period 1.

f.  This is a nonreactive element for which n is the second letter.

11. Predict whether each of the following elements would be more likely to gain or lose electrons:

a. Cl ______

b. Mg______

c. Pb______

d. S______

e. Al______

12. Name two factors that the arrangement of the periodic table is based on.

13. Identify the following as a chemical change or a physical change.

______a. Zinc metal burns in air to form zinc oxide.

______b. The compound boron nitride is used almost as hard as a diamond and is used for glass cutting.

______c. Hydrogen sulfide is removed from the natural gas used to heat homes through a reaction with oxygen.

______d. Carbon dioxide and water are produced when gasoline undergoes combustion in a car engine.

______e. Isopropyl alcohol evaporates when it is placed on your skin.

______f. Calcium nitrate dissolves in water.

14. What results for each of the following tests would you expect to see if we tested chromium (Cr)?

a. ______Appearance: dull or shiny

b. ______Flexibility: malleable or brittle

c. ______Conductivity: Conducts or insulates