Answer the following question given this paragraph: Q: During diastole, what happens to the elastic walls of the arteries? Choices: - they expand - they become hardened - they evolve - they snap back A:
they snap back
(Question)
Answer the following question given this paragraph: A: The copper has become tarnished. The tarnishalso called patinais a compound called copper carbonate, which is green. Copper carbonate forms when copper undergoes a chemical reaction with carbon dioxide in moist air. The green patina that forms on copper actually preserves the underlying metal. That's why it's not removed from the statue. Some people also think that the patina looks attractive. Q: What compound gives tarnished copper it's green color? Choices: - bronze - zinc - brass - copper carbonate A:
(Answer)
copper carbonate
Ques: Answer the following question given this paragraph: At 1600 C, quartz melts to yield a viscous liquid. When the liquid cools, it does not crystallize readily but usually supercools and forms a glass, also called silica. The SiO4 tetrahedra in glassy silica have a random arrangement characteristic of supercooled liquids, and the glass has some very useful properties. Silica is highly transparent to both visible and ultraviolet light. For this reason, it is important in the manufacture of lamps that give radiation rich in ultraviolet light and in certain optical instruments that operate with ultraviolet light. The coefficient of expansion of silica glass is very low; therefore, rapid temperature changes do not cause it to fracture. CorningWare and other ceramic cookware contain amorphous silica. Silicates are salts containing anions composed of silicon and oxygen. In nearly all silicates, sp3-hybridized silicon atoms occur at the centers of tetrahedra with oxygen at the corners. There is a variation in the silicon-to-oxygen ratio that occurs because silicon-oxygen tetrahedra may exist as discrete, independent units or may share oxygen atoms at corners in a variety of ways. In addition, the presence of a variety of cations gives rise to the large number of silicate minerals. Many ceramics are composed of silicates. By including small amounts of other compounds, it is possible to modify the physical properties of the silicate materials to produce ceramics with useful characteristics. Q: Many ceramics are composed of what, which are salts containing anions composed of silicon and oxygen? Choices: - vinylates - crystals - soils - silicates A:
Ans: silicates
(Q).
Answer the following question given this paragraph: Q: What are large vesicles derived from the endoplasmic reticulum and golgi apparatus? Choices: - chloroplasts - tubules - alleles - vacuoles A:
(A).
vacuoles
Ques:Answer the following question given this paragraph: You can see how Mendeleev organized the elements in the Figure below . From left to right across each row, elements are arranged by increasing atomic mass. Mendeleev discovered that if he placed eight elements in each row and then continued on to the next row, the columns of the table would contain elements with similar properties. He called the columns groups . They are sometimes called families, because elements within a group are similar but not identical to one another, like people in a family. Q: Mendeleev organized what basic units into rows and columns? Choices: - solutions - compounds - animals - elements A:

Ans:elements
Question: Answer the following question given this paragraph: Wave frequency is the number of waves that pass a fixed point in a given amount of time. Q: The number of waves that pass a fixed point in a given amount of time is referred to as what? Choices: - tendency frequency - wave speed - wave harmonics - wave frequency A:
Answer:
wave frequency