Metals quiz

• Which metals are found uncombined in the Earth's crust?

  Gold, silver, and copper
• How are most metals found in the Earth's crust?

  Combined with other elements
• How is aluminum extracted from its ore?

  Using electricity
• What method is used to extract iron from its ore?

  Heating with carbon
• What are the specific properties of metals?

  Density, conductivity, malleability, ductility
• What is an alloy?

  A mixture of metals or non-metals
• What are examples of alloys?

  Brass, solder, and stainless steel
• Why are metals alloyed?

  To change their properties for specific uses
• What do metal oxides result from?

  Reactions of metals with oxygen
• What do reactions of metals with acid produce?

  Hydrogen gas and a salt
• What do reactions of metals with water produce?

  Hydrogen gas
• Which metals do not react with dilute acid?

  Copper, silver, and gold
• What does the test for hydrogen involve?

  It burns with a "pop"
• What is corrosion?

  A chemical reaction changing metal to compound
• What is rusting?

  The corrosion of iron
• What results from rusting?

  A loss of structural strength
• What do rust indicators show?

  The extent of the rusting process
• What is required for rusting to occur?

  Oxygen and water
• How does acid rain affect corrosion?

  It increases the rate of corrosion
• How does salt affect corrosion?

  It increases the rate of corrosion
• What methods can protect against corrosion?

  Painting, greasing, and galvanizing
• What happens to iron when attached to more reactive metals?

  It does not rust
• What metals are used to protect iron?

  Zinc and scrap magnesium
• How does a battery produce electricity?

  From a chemical reaction
• Why do batteries need to be replaced?

  Due to chemicals being used up
• What is an example of a rechargeable battery?

  Lead-acid battery
• How can electricity be produced in a cell?

  By connecting different metals with ions
• What is the relationship between voltage and metal reactivity?

  Voltage relates to reactivity differences
• How are metals obtained from the Earth?

  By recycling and extraction
• What is the purpose of the ion solution in a battery?

  To complete the circuit
• What percentage of elements in the Earth's crust are metals?

  Over 75%
• What can metals be shaped into?

  Different shapes and wires
• What are the properties of metals compared to non-metals?

  Good conductors, strong, malleable, ductile
• What is electrolysis?

  Decomposition of compounds by electricity
• What happens during electrolysis of copper chloride?

  Copper is deposited at the cathode
• What is aluminum extracted from?

  Bauxite
• What is produced when copper oxide is heated with carbon?

  Copper and carbon dioxide
• What is the reaction of zinc with water?

  Zinc oxide and hydrogen
• What is the general reaction of metals with water?

  Metal + Water → Metal oxide + Hydrogen
• What is the general reaction of metals with steam?

  Metal + Steam → Metal oxide + Hydrogen