Which of the following can be characterized as a strong base?

A) Ba(OH)2
B) NH3
C) both a and b
D) neither a nor b


A

Environmental & Atmospheric Sciences

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The pKa of lactic acid is 3.86. What is the pH of a buffer in which the lactic acid concentration is 0.20 M and the sodium lactate concentration is 2.0 M?

A) 2.86 B) 3.86 C) 4.86 D) 7.00

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The horizon where leached minerals and organic matter accumulate is called the ________

A) O horizon B) parent material C) B horizon D) E horizon E) C horizon

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The approximate land surface of the Earth totals more than ________ square kilometers (square miles)

A) 1.5 thousand (579) B) 15 thousand (5,791) C) 150 million (50,791,000) D) 1.5 billion (50,791,000,000) E) 15 trillion (50,791,000,000,000)

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Which nation in Latin America remains the top producer of cocaine?

A) Peru B) Argentina C) Chile D) Colombia E) Brazil

Environmental & Atmospheric Sciences