If a chemist wishes to carry out a reaction in which one reactant is a solid and one is a liquid, which of the following will be most effective in speeding up the reaction?
A) adding more liquid reactant
B) grinding the solid to a form a powder
C) placing a larger crystal of the solid in the same volume of liquid reactant
D) All of the above will be equally effective.
B
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A 1-kg aluminum frying pan, of specific heat 900 J/kg°C, is heated on a hot stove from 20°C to 100°C, which requires an amount of heat of
A. 144,000 J. B. 1800 J. C. 72,000 J. D. 900 J.
The direct measurement of the motion of continental plates was impossible with land-based instruments because all motion is _____.
A ) absolute B ) relative C ) one-dimensional D ) at less than 60 Hz
In South America and other LDCs with high total fertility rates, farmers engage in slash and burn of the rain forest to
A) increase areas for farming. B) provide fuel for cooking and heating homes. C) support the logging industry. D) provide wood for pulp to produce paper.
El Niño has no measurable impacts on weather in the United States
Indicate whether the statement is true or false