What is the name of the following compound?CaCl2
A. calc two
B. calcium chloride
C. dichlorocalcium
D. carbon chloride
E. dicalcium chloride
Answer: B
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Which of the following is an important role of phosphorus in biology?
A) It is an essential component of ATP, which stores the energy acquired in the light reaction phase of photosynthesis. B) It allows increased amounts of energy available to organisms. C) It is an important component of proteins. D) All of these are roles of phosphorus.
What is the percentage of the land surface covered by arid regions?
a. ~ 1 % b. ~ 5 % c. ~ 25 % d. ~ 40 %
A minerals luster is produced by its ability to transmit light. Opaque minerals always have a metallic luster because they do not transmit any light
Indicate whether the statement is true or false
When a chemical change occurs, the event is usually accompanied by _____.
a. The release of energy b. Spattering or boiling c. A physical change d. The evolution of gas