Answer the following question given this paragraph: For static electric charges, the electromagnetic force is manifested by the Coulomb electric force alone. If charges are moving, an additional force emerges, called magnetism. The century realization that electricity and magnetism are dual aspects of the same force completely changed our understanding of the world we live in. Insights due to Ampere, Gauss, and Maxwell led to the understanding that moving charges electric currents create magnetic fields. Varying magnetic fields create electric fields. Thus a loop of wire in a changing magnetic field will have current induced in it. This is called electromagnetic induction. Magnetic fields are usually denoted by the letter and are measured in Teslas, in honor of the Serbian physicist Nikola Tesla. Q: The measure of magnetic fields is named after a serbian physicist. what is his name? Choices: - Carl Sagan - Albert Einstein - Niels Bohr - nikola tesla A:
nikola tesla
Answer the following question given this paragraph: MyPyramid can help you choose foods wisely for good health. Each colored band represents a different food group. The key shows which food group each color represents. Which colored band of MyPyramid is widest? Which food group does it represent?. Q: Mypyramid features colored bands that represent what? Choices: - caloric content - essential vitamins - popular diets - food groups A:
food groups
Q: Answer the following question given this paragraph: A solution is a mixture of two or more substances that has the same composition throughout. Some solutions are acids, some are bases. Q: Acidity is measured by what physical property? Choices: - k - ps - amp - ph A:
A: ph
Question: Answer the following question given this paragraph: Quantum-mechanical calculations suggest why the observed bond angles in H2O differ from those predicted by the overlap of the 1s orbital of the hydrogen atoms with the 2p orbitals of the oxygen atom. The mathematical expression known as the wave function, , contains information about each orbital and the wavelike properties of electrons in an isolated atom. When atoms are bound together in a molecule, the wave functions combine to produce new mathematical descriptions that have different shapes. This process of combining the wave functions for atomic orbitals is called hybridization and is mathematically accomplished by the linear combination of atomic orbitals, LCAO, (a technique that we will encounter again later). The new orbitals that result are called hybrid orbitals. The valence orbitals in an isolated oxygen atom are a 2s orbital and three 2p orbitals. The valence orbitals in an oxygen atom in a water molecule differ; they consist of four equivalent hybrid orbitals that point approximately toward the corners of a tetrahedron (Figure 8.7). Consequently, the overlap of the O and H orbitals should result in a tetrahedral bond angle (109.5). The observed angle of 104.5 is experimental evidence for which quantummechanical calculations give a useful explanation: Valence bond theory must include a hybridization component to give accurate predictions. Note that orbitals may sometimes be drawn in an elongated "balloon" shape rather than in a more realistic "plump" shape in order to make the geometry easier to visualize. Q: This process of combining the wave functions for atomic orbitals is called what? Choices: - assimilation - hydration - activation - hybridization A:
Answer: hybridization
*Question*
Answer the following question given this paragraph: Metallic character refers to the level of reactivity of a metal. Metals tend to lose electrons in chemical reactions, as indicated by their low ionization energies. Within a compound, metal atoms have relatively low attraction for electrons, as indicated by their low electronegativities. By following the trend summary in the figure below, you can see that the most reactive metals would reside in the lower left portion of the periodic table. The most reactive metal is cesium, which is not found in nature as a free element. It reacts explosively with water and will ignite spontaneously in air. Francium is below cesium in the alkali metal group, but is so rare that most of its properties have never been observed. Q: Do metals tend to gain electrons or lose electrons in chemical reactions? Choices: - develop electrons - same number of electrons - gain electrons - lose electrons A:
**Answer**
lose electrons
*Question*
Answer the following question given this paragraph: The study of viruses is known as virology and people who study viruses are known as virologists . Viruses infect and live inside the cells of living organisms. When viruses infect the cells of their host, they may cause disease. For example, viruses cause AIDS (Acquired immune deficiency syndrome), influenza (flu), chicken pox, and the common cold. Therapy is sometimes difficult for viral diseases. Antibiotics have no effect on viruses and only a few antiviral drugs are available for some diseases. One of the best ways to prevent viral diseases is with a vaccine , which produces immunity . But vaccines are available for only a few diseases. Q: What do vaccines produce to combat viral diseases? Choices: - sterility - sensitivity - hyperthyroidism - immunity A:
**Answer**
immunity