Unit 2 Section B: Earth's Mineral Resources

ReviewName______

Earth's composition

______- air (100 km)

______- oceans

______- earth's crust

The ______supplies metal-bearing ores and petroleum.

______- mineral (______) containing element of interest

The earth's resources are not ______distributed. For example Africa has ______% of world's chromium,. ______% of the cobalt and ______% of the manganese.

Properties of metals:

1.______

2.______

3.______

4.______

5.______

6.______

The ______reactive metals (gold, silver, copper) were 1st discovered by man because they exist in an ______or "free" state.

Metals are extracted or ______from ores by different methods.

The valueof metals is determined by

1.______

2.______

3.______

4.______

5.______

An ______is a mixture of metals. The first alloy discovered was ______. It is a mixture of ______and ______.

Four signs that a reaction may have occurred are :

1.______

2.______

3.______

4.______

Data for a reactivity investigation may look like this:

Unknown Metal / Reaction with solution of A ions / Reaction with solution of B ions / Reaction with solution of C ions / Unknown Metal
A / NR / NR / Color change, bubbles, appears cloudy / A
B / Bubbles and particles form / NR / Bubbles, particles form, color change / B
C / NR / NR / NR / C

1) Arrange the metals A, B, and C from most reactive to least reactive.

2) Which metal is most likely to be found in an uncombined or elemental

metallic state in nature? Explain.

Three types of metal refining processes are:

1.______(electricity provides electrons)

2.______(treat ore with heat in presence of carbon)

3.______(treat ore with aqueous solution to precipitate metal)

Name the type of refining process will most likely be used to refine the following:

Aluminum ______

Iron ______

Lithium______

Platinum______

Identify at least three questions that should be answered prior to mining a metallic ore at a given location.

Predict if the following reactions will occur

______1.Au+3(aq) + Ca(s) →

______2.AgNO3(aq) + Zn(s) →

______3.solid copper and aqueous chromium (III) chloride →

______4.Zn(s) + Cr+3(aq) →

Define reduction and oxidation in terms of electron transfer.

Based on the metallic activity series answer the following questions:

  1. Which one of the following reactions is more likely to occur? Explain

Cu2+ (aq) + Au(s) 

OR

Au2+(aq) + Cu (s) 

  1. A magnesium strip is placed in an aqueous solution of copper (II) nitrate, Cu(NO3)2. Will a reaction occur? What do you expect to observe? Explain.

______

______

______

Identify whether oxidation or reduction is taking place in the following half reactions:

a.Cr+2 + 2e- → Cr______

b.Ni → Ni+3 + 3e-______

Consider the following equation:Zn(s) + Mg+2(aq) → Zn+2(aq) + Mg(s)

Which reactant was reduced? ______

Which reactant was oxidized? ______

What is the oxidizing agent? ______

What if the reducing agent? ______

Write an equation showing the reduction of Au+2 ions with Fe metal.

Write an equation showing the oxidation of Ca metal with Pb+2 ions.

Using the metal activity series, which element is most reactive with oxygen?

Goldaluminumlithiumchromium

Using the relative positions on the periodic table, which element is the most reactive?

Cadmium or Rubidium

What is an alloy? Name 2.

Elemental iron is obtained through a process known as pyrometallurgy. In this process the ore is heated with coke in a blast furnace. Is pyrometallurgy a chemical change or a physical change? How do you know?