2012年1月21日星期六

Which of the folowing items is a physical property?

a)the corrosive action of acid rain on granite

b)the odor of spearmint gum

c)the combustion of gasoline

d)the tarnishing of a copper statue

e)none of the above

Which of the folowing items is a physical property?
b)the odor of spearmint gum
Reply:The odor of the gum. All of the rest of the possible answers are types of chemical reactions.
Reply:B.



With A, there is a chemical reaction that takes place between acid and granite that produces another product - corrosion.



With C, combustion causes a chemical reaction between fuels (carbon, hydrogen, sulfur, coal, oil, gas) and oxygen that results in water, carbon dioxide and heat.



With D, there is a chemical reaction between copper and oxygen that causes the tarnish (green color)
Reply:b


没有评论:

发表评论