How many ketones have the molecular formula C5H10O?
A) 1
B) 2
C) 3
D) 4
C
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Thick salt deposits have been explained by evaporation in silled (also called “barrier”) basins
a. True b. False
Which farming practice(s) reduce(s) soil erosion?
A. planting cover crops B. contour farming and terracing C. planting wind breaks D. planting wind breaks, contour farming and terracing, and planting cover crops
The pH scale is a quantitative representation of the relative amounts of ________
A) water and carbon dioxide molecules in solution B) hydrogen and polar water molecules in solution C) alkaline and basic ions in solution D) hydrogen and oxygen ions in solution E) hydrogen and hydroxyl ions in solution
Biodiversity experts estimate that during this century, the extinction rate due to human activities will rise to ____ times the background extinction rate.
A. 3 B. 10 C. 20 D. 100 E. 10,000