Why does a glowing splint of wood burn only slowly in air, but rapidly in a burst of flames when placed in pure oxygen?
A) There is a greater number of collisions between the wood and oxygen molecules.
B) Oxygen is a flammable gas.
C) Pure oxygen is able to absorb carbon dioxide at a faster rate.
D) A glowing wood splint is actually extinguished within pure oxygen because there's no room for the smoke to expand.
A
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A common automobile engine is 20% efficient. The average retarding force along a road is 1000 N. The energy content of fuel is 40 MJ/L. This automobile can achieve how many kilometers per liter?
A. 10 km/L. B. 12 km/L. C. 14 km/L. D. 8 km/L.
Thermometers directly measuring temperature data on a global scale show the most recent cooling period ended around
A) 1860.
B) 1940.
C) 1980.
D) 2010.
All other factors equal, if a body of magma becomes more felsic, its viscosity will ________.
A. Increase B. decrease C. stay the same chemical D. composition has no effect on viscosity
If a bed strikes north it must ________.
A. be horizontal B. have a strike of 270 degrees C. dip south D. have a strike of 90 degrees E. dip either east or west