Q: Phosphorus exists as several allotropes, the most common being red, black, and what? Read this paragraph and choose the correct option from the provided answers: Phosphorus exists as several allotropes, the most common being red, black, and white phosphorus. White phosphorus consists of tetrahedral P4 molecules and melts at 44.15C; it is converted to red phosphorus by heating at 400C for several hours. The chemical differences between red and white phosphorus are considerable: white phosphorus burns in air, whereas red phosphorus is stable; white phosphorus is soluble in organic compounds, whereas red phosphorus is not; white phosphorus melts at 44.15C, whereas red phosphorus melts at 597C. If the enthalpy of fusion of white phosphorus is 0.659 kJ/mol, what is its S? Black phosphorus is even less reactive than red. Based on this information, which allotrope would you predict to have the highest entropy? the lowest? Why?. Choices: - purple phosphorus - yellow phosphorous - green phosphorus - white phosphorus A:
white phosphorus

(Question)
Q: What is the transition from liquid to gas is called? Read this paragraph and choose the correct option from the provided answers: The liquid to gas transition is called boiling. Choices: - freezing - condensing - melting - boiling A:
(Answer)
boiling

Ques: Q: What change can you expect in vectors that are perpendicular to each other? Read this paragraph and choose the correct option from the provided answers: Vectors that are perpendicular to each other have no effect on each other. Choices: - Chemical reaction - Large Effect - Molecular Reaction - no effect A:
Ans: no effect

(Q).
Q: What are the cells that break down inorganic molecules to supply energy for the cell, and use carbon dioxide as a carbon source? Read this paragraph and choose the correct option from the provided answers: Chemoautotrophs are cells that break down inorganic molecules to supply energy for the cell, and use carbon dioxide as a carbon source. Chemoautotrophs include prokaryotes that break down hydrogen sulfide (H 2 S the "rotten egg" smelling gas), and ammonia (NH 4 ). Nitrosomonas , a species of soil bacterium, oxidizes NH 4 + to nitrite (NO 2 - ). This reaction releases energy that the bacteria use. Many chemoautotrophs also live in extreme environments such as deep sea vents. Choices: - staurikosaurus - fluctuations - Sediments - chemoautotrophs A:
(A).
chemoautotrophs

Ques:Q: When electrons return to a lower energy level, they emit the excess energy in the form of what? Read this paragraph and choose the correct option from the provided answers: When electrons return to a lower energy level, they emit energy in the form of light. Choices: - weight - electricity - energy - light A:

Ans:light

Q: What can exposure to chemical or biological agents cause later in life? Read this paragraph and choose the correct option from the provided answers: Choices: - adaptation - spontaneous mutation - regression - an acquired immunodeficiency A:
an acquired immunodeficiency