Answer the following question given this paragraph: The angle at which light bends when it enters a different medium depends on its change in speed. The greater the change in speed, the greater the angle of refraction is. For example, light refracts more when it passes from air to diamond than it does when it passes from air to water. That's because the speed of light is slower in diamond than it is in water. Q: The angle at which light bends when it enters a different medium is known as what? Choices: - bounce - frequency - resonance - refraction A:
refraction
Answer the following question given this paragraph: Technically, any redox reaction can be set up to make a voltaic cell. In modern society, however, only certain redox reactions are put to practical use. A portable voltaic cell that generates electricity to power devices for our convenience is called a battery. All batteries are based on redox reactions. The first battery (called a "voltaic pile") was constructed by the Italian scientist Alessandro Volta in 1800 and was based on the copper/zinc reaction depicted in - ball-ch14_s03_f01. Unfortunately, it was messy, requiring quantities of copper and zinc salts dissolved in water. In 1866, the French scientist Georges Leclanche invented the dry cell, a precursor to today's modern battery. A schematic of a dry cell is shown in - ball-ch14_s03_f02. The zinc case and the central carbon rod serve as the anode and cathode, respectively. The other reactants are combined into a moist paste that minimizes free liquid, so the battery is less messy (hence the name dry cell). The actual redox reaction is complex but can be represented by the following redox reaction: + 2+ Zn + 2MnO2 + 2NH4 Zn + Mn2O3 + 2NH3 + H2O A dry cell has a voltage of about 1.56 V. While common and useful, dry cells have relatively short lifetimes and contain acidic components. They also cannot be recharged, so they are one-use only. Batteries that can be used only once are calledprimary batteries. Figure 14.2 Dry Cells. Q: Technically, any redox reaction can be set up to make a what? Choices: - Black Cell - blocky cell - skaht cell - voltaic cell A:
voltaic cell
Q: Answer the following question given this paragraph: There are two main types of sedimentary rocks: clastic and chemical. Clastic rocks are made of sediments, which are sometimes called clasts. Creating rocks from sediments is called lithification . Chemicals precipitate from liquid to form chemical sedimentary rocks. Q: What are the two main types of sedimentary rocks? Choices: - sandstone and shale - shale and limestone - basalt and dolomite - clastic and chemical A:
A: clastic and chemical
Question: Answer the following question given this paragraph: The highest-numbered shell is the third shell, which has 2 electrons in the 3s subshell and 3 electrons in the 3p subshell. That gives a total of 5 electrons, so neutral phosphorus atoms have 5 valence electrons. The 10 remaining electrons, from the first and second shells, are core electrons. Q: How many valence electrons do neutral phosphorus atoms have? Choices: - nine - three - four - five A:
Answer: five
*Question*
Answer the following question given this paragraph: Point masses are structureless particles that cannot spin. Q: What type of masses are structureless particles that cannot spin? Choices: - weightless masses - turning masses - inertial mass - point masses A:
**Answer**
point masses
Q: Answer the following question given this paragraph: Q: What two substances do plants give off when they make food? Choices: - water and oil - carbon dioxide and oxygen - chlorophyll and nitrogen - oxygen and water A:
A: oxygen and water