Infunity Forum

B4 U Start... Dont Post An Answer That U Guessed(Didnt Read or Just Wanted 2 Give Me A 25% Chance Correct... Wht U Guys Give Me Is Wht I Will Use On My Assignment =]
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1. What happens when a strip of zinc is placed in a silver nitrate solution?
a) Hydrogen bubbles form on strip of zinc, and zinc ions go into the solution.
b) Zinc ions go into the solution, and silver forms on the strip of zinc.
c) A Chemical reaction involving zinc does not take place.
d) Zinc ions go into the solution, and oxygen forms.
2. What happens when a strip plastic is placed in silver nitrate solution?
a) A chemical change involving plastic is not observed.
b) Hydrogen bubbles form on the strip of plastic.
c) The plastic quickly disintegrates.
d) Silver forms on the strip of plastic.
3. Archaeologists found bracelets and other objects manufactured from copper in a burial ground near Prince Rupert Harbour. Copper buried in rain forest soil tends to quickly deteriorate due to acidic solutions in the soil. What saved these copper artifacts from the damaging effects of acidic solutions?
a) Abundant decaying vegetative matter nearby.
b) Layers of clay impermeable to water.
c) Abundant snowfall.
d) Layers of sea shells.
4. Hydrogen sulphide can be used in aqueous solutions to separate out metal ions. On the other hand, hydrogen sulphide in the air causes considerable damage to silver objects. When a silver goblet tarnished in the presence of hydrogen sulfide (and oxygen), 1.20 mol of silver sulfide formed. What amount of silver was consumed?
a) 4.80 mol
b) 2.40 mol
c) 1.20 mol
d) 0.600 mol
5. Tin does not react with iron(II) oxide, but it does reduce lead(II) oxide to lead. What is the correct arrangement of the metals in order of decreasing reactivity?
a) Tin, lead, iron
b) Iron, tin, lead
c) Lead, iron, tin
d) Tin, iron, lead
6. Which is least reactive with aqueous solutions of metal ions?
a) Tin
b) Zinc
c) Gold
d) Calcium
7. A block of magnesium attached to an iron pipeline running through moist soil may prevent the pipeline from oxidizing and corroding. Magnesium is a very reactive metal. When attached to the pippeling, the magnesium itself will corrode and keep the pipeline a cathode. Based on this form of protection, which of these metals can also protect an iron pipeline from corrosion?
a) Zinc
b) Lead
c) Copper
d) Silver
8. A scientist is designing a voltaic cell. Which combination of metals, along with their ions, can be used to produce the highest voltage?
a) Mg and Cu
b) Mg and Zn
c) Mg and Pb
d) Mg and Fe
9. Which are the least likely to be dependent on alkaline batteries?
a) Flashlights
b) Trucks
c) MP3 Players
d) Smoke detectors

Post Answerz =]

1 D
2 A not sure
5 B
6 C
7 A
8 C
other i think correct le xD
check ERS u will find out the answer in 5 6 8 LOL