Chemical Reactions
Can matter be created or destroyed? Why or why not?
No; Law of Conservation of Matter
What happens in a single replacement reaction?
One element in a compound is exchanged for another
What is a mineral compound from which we can get a useful metal called?
Ore
DOUBLE JEOPORDY
What is corrosion?
What is hard water?
Water with dissolved salts of calcium and magnesium
What does a substance combine with when it burns?
Oxygen
When copper reacts with silver nitrate, what element is set free?
Silver
Why do we need to remove metals from their ores?
So they can be used
What causes metals to corrode?
Exposure to air and water
What is ground water?
Water that seeps into the ground
What is a synthesis reaction?
2 elements combine to form a compound
What is it called when atoms from 2 compounds trade places?
Double replacement reaction
What is a mixture of two or more metals called?
Alloy
What protects metals from corrosion?
Oil, paint, alloys, sacrificial metals
True or False: Soap forms suds easily in hard water. Why?
False
True or False: Rusting is a synthesis.
True
How is double replacement different from single replacement?
Double: 2 compounds; Single: element + compound
True or False: The properties of an alloy are the same as the metals in it.
False
What is an iron nail coated with zinc called?
Galvanized iron
Water that needs chemical softeners is called what?
Permanent hard water
What is a decomposition reaction?
A reaction that breaks down compounds into simpler substances
DOUBLE JEOPORDY
What is a precipitate?
What elements make up steel?
Iron, chromium, nickel
What is an electrolyte?
A compound that forms ions when dissolved
How does a water softener work?
Removes metallic ions
The decomposition of water produces what 2 elements?
Hydrogen and oxygen
What is a neutralization reaction?
Acid + base = salt + water
What elements make up bronze?
Copper and tin
What is ionization?
Formation of ions
Do detergents form soluble or insoluble substances in hard water?
Soluble
More active metals do what to less active metals?
Replace them
Why do oxidation and reduction occur together?
Electrons lost by one atom are gained by another