Sterling Silver Candle
Saturday, September 4th, 2010Sterling Silver Candle
A few chemistry questions I need help with?
1. Which of the following changes are exothermic, and which are endothermic
a) a firecracker when lit
b) a burnig candle
c) Melting the wax around the wick of a candle
d)A plant making suger by photosthess
e)metabolism of the suger in candy
2.Sterling silver is....
a) an element
b) a compound
c) a heterogeneous mixture
d) a homogeneous mixture
3. Which of thefollowing is not ductie
a) carbon
b) silver
c) copper
d) iron
1) a, b,e are Exo thermic. c,d are Endo thermic - to produce sugar you need energy and to melt something you need energy as well. Burning or oxidation is basically exothermic.
2) d because it is an alloy
3) a, because one of the characteristics of all metals,(silver, copper and iron) is ductility.
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