How many carboxylic acids have the molecular formula C4H8O2?
A) 1
B) 2
C) 3
D) 4
B
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Distinguish between atoms and molecules. Which is made of which?
What will be an ideal response?
The spread of something over a given study area is
A) concentration. B) density. C) distribution. D) pattern. E) diffusion.
The crustal thickness in the Great Basin is ________ than mid-continental North American crust.
A. thinner than oceanic crust and thinner B. thicker C. thicker than oceanic crust and thinner D. thinner E. thicker than oceanic crust and thicker
Annual row crops such as ________ cause the highest erosion rates because ________.
A. Wheat and coffee; they need so much water B. Beans and coffee; trees are usually cut down for the fields C. Tea and beans; plowing in the fall is required for planting of these annual spring crops D. Corn and coffee; they use so many nutrients E. Corn and beans; soil is left bare for the majority of the year