Which of the following reagents was used in the original breath alcohol test used by law enforcement officials?
A) Cr3+
B) hydrogen peroxide
C) potassium dichromate
D) none of these
C
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Suppose the wind speed increases from 8 km/h to 40 km/h. Which of the following expresses the factor by which the force of the wind will have increased?
A. 2 B. 4 C. 5 D. 25
Which of the following countries of Southwest Asia and North Africa has the most diversified economy, and is not reliant on oil?
A) Qatar B) Kuwait C) United Arab Emirates D) Saudi Arabia E) Turkey
Explain the difference between the terms silicon and silicate
What will be an ideal response?
In a hilly region, the best place to plant crops that are sensitive to low temperatures is
a. ?on the valley floor. b. ?along the hillsides. c. ?on the top of the highest hill. d. ?in any dry location. e. ?near streams and rivers.