Answer the following question given this paragraph: Dissolved mineral salts wash into the ocean. As ocean water evaporates, it leaves the salts behind. This makes the water saltier. Ocean water is about 3.5 percent salts. The main salt is sodium chloride. Q: Concentration of what, the substance left behind when ocean water evaporates, is about 3.5 percent? Choices: - hydrogen - sugar - quartz - salts A:
salts
Answer the following question given this paragraph: There are many other examples of redox reactions in which two neutral elements combine to make a compound. These often take the form of a metal being oxidized and a nonmetal being reduced, resulting in an ionic compound. Two nonmetallic elements can also undergo a redox reaction of this type, in which the less electronegative element is oxidized and the more electronegative element is reduced. Q: When a metal is oxidized and a nonmetal is reduced in a redox reaction, what is the resulting compound called? Choices: - soluble compound - alloy - magnetic compound - ionic compound A:
ionic compound
Q: Answer the following question given this paragraph: Energy also constantly changes back and forth between kinetic and potential energy. Kinetic energy is the energy of movement. For example, a ball falling through the air has kinetic energy because it is moving ( Figure below ). The random motion of molecules is due to kinetic energy, and the driving force behind diffusion. Q: Energy constantly changes back and forth between kinetic and what type of energy? Choices: - practical - physical - mechanical - potential A:
A: potential
Question: Answer the following question given this paragraph: Q: What globular protein is used in the construction of the hollow tube? Choices: - actin - cyclin - keratin - tubulin A:
Answer: tubulin
*Question*
Answer the following question given this paragraph: Carbon sequestration is any way of removing carbon dioxide from the atmosphere and storing it in another form. Carbon is sequestered naturally by forests. Trees take in carbon dioxide for photosynthesis. Artificial methods of sequestering carbon underground are being researched. Q: What term refers to any method of removing carbon dioxide from the atmosphere and storing it in another form? Choices: - carbon footprint - carbon metamorphosis - carbon transfer - carbon sequestration A:
**Answer**
carbon sequestration
Answer the following question given this paragraph: A fluorescent light bulb produces visible light by fluorescence. Fluorescence occurs when a substance absorbs shorter-wavelength ultraviolet light and then gives off the energy as visible light. The compact fluorescent light bulb (CFL) in the Figure below contains mercury gas that gives off ultraviolet light when electricity passes through it. The inside of the bulb is coated with a substance called phosphor. Phosphor absorbs the ultraviolet light and then gives off most of the energy as visible light. Q: What light-producing process occurs when a substance absorbs shorter-wavelength ultraviolet light and then gives off the energy as visible light? Choices: - candescence - resistance - luminescence - fluorescence A:
fluorescence