If a carbon atom combines with oxygen atoms to form CO2, this would be described as a
a. Physical change.
b. Chemical change.
c. It is both a physical and chemical change.
d. First, it is a physical change, but then it becomes a chemical change.
e. It is not a physical change or a chemical change. It is scientific change.
B
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Which is an example of the hidden cost of gasoline?
A. Military protection of oil producing countries in the Middle East. B. Building large storage tank forms to hold surplus oil. C. Building modern tankers to ship oil that will not leak if ruptured. D. Finding new source of oil as older fields become depleted.
A very comprehensive and effective hazardous-waste collection and detoxification program is in
a. France b. Denmark c. Norway d. Yugoslavia e. the United States
At which of the following cities can cirrus clouds be observed at an altitude of 3000 metres above the surface?
A. Calgary, Alberta B. Vancouver, British Columbia C. Toronto, Ontario D. Whitehorse, Yukon
Porosity of rocks typically remains stable. In other words, it does not vary considerably over short distances.
a. true b. false