Answer the following question given this paragraph: Evaporation takes place when water on Earth's surface changes to water vapor. The sun heats the water and gives water molecules enough energy to escape into the atmosphere. Most evaporation occurs from the surface of the ocean. Q: What takes place when water on earth's surface changes to water vapor? Choices: - condensation - transpiration - absorption - evaporation A:
evaporation
Answer the following question given this paragraph: So far we have looked at ionic compounds, in which atoms of various elements gain or lose electrons to produce ions. The resulting ions are held together by strong attractions between oppositely charged particles. However, this only works for bonds between atoms in which one partner (the metal) has a tendency to lose electrons, and the other (the nonmetal) has a tendency to gain them. Then how might two nonmetals, such as nitrogen and oxygen, form chemical bonds? Neither is likely to lose electrons and become a cation, but both require more electrons to reach a noble gas configuration. Instead of a complete transfer of electrons, these atoms can bond by sharing electrons, producing what is called a covalent bond . When a group of atoms are joined together by covalent bonds, the resulting structure is called a molecule . Molecules are generally much smaller than the extended three-dimensional networks of ions that are seen in ionic compounds. We will look much more at covalent bonding and molecules in future chapters, but for now, we will focus on the ways in which molecules are named. Q: Ionic compound atoms of various elements gain or lose electrons to? Choices: - become ions - expel ions - flatten ions - produce ions A:
produce ions
Q: Answer the following question given this paragraph: Hardness helps determine how an element (especially a metal) might be used. Many elements are fairly soft (silver and gold, for example) while others (such as titanium, tungsten, and chromium) are much harder. Carbon is an interesting example of hardness. In graphite (the "lead" found in pencils) the carbon is very soft, while the carbon in a diamond is roughly seven times as hard. Q: Although they differ vastly in hardness, pencil lead and diamonds both contain what element? Choices: - graphite - hydrogen - oxygen - carbon A:
A: carbon
Question: Answer the following question given this paragraph: The term theory is used differently in science than it is used in everyday language. A scientific theory is a broad explanation that is widely accepted because it is supported by a great deal of evidence. Because it is so well supported, a scientific theory has a very good chance of being a correct explanation for events in nature. Because it is a broad explanation, it can explain many observations and pieces of evidence. In other words, it can help connect and make sense of many phenomena in the natural world. Q: What allows theories to be widely accepted? Choices: - hypothesis - observation - theory - evidence A:
Answer: evidence
*Question*
Answer the following question given this paragraph: Describe hotspots and the volcanic activity they create. Q: What are the light wavelengths that the human eye can detect called? Choices: - ultraviolet light - apparent light - infrared light - visible light A:
**Answer**
visible light
*Question*
Answer the following question given this paragraph: Clubmosses can resemble mosses; however, clubmosses have vascular tissue, while mosses do not. Q: What tissue do clubmosses have that mosses do not? Choices: - dioxide tissue - nuclei - chorophyll - vascular tissue A:
**Answer**
vascular tissue