Q: At what temperature does solid water melt to a liquid? Read this paragraph and choose the correct option from the provided answers: The process in which rocks or other solids change to liquids is called melting. Melting occurs when particles of a solid absorb enough energy to partly overcome the force of attraction holding them together. This allows them to move out of their fixed positions and slip over one another. Melting, like other changes of state, is a physical change in matter, so it doesn't change the chemical makeup or chemical properties of matter. Choices: - below 32 degrees c - below 0 degrees c - above 32 degrees c - at temperatures above 0 degrees c A:
at temperatures above 0 degrees c

Q: Which carbohydrates can be classified in terms of chain length? Read this paragraph and choose the correct option from the provided answers: Simple carbohydrates can be classified in terms of chain length. Choices: - binary - atomic - complex - simple A:
simple

Q: What are biochemical compounds, such as fats and oils, that consist of fatty acids and store energy? Read this paragraph and choose the correct option from the provided answers: Lipids are biochemical compounds such as fats and oils. They consist of fatty acids, which may saturated or unsaturated. Lipids are used to store energy. They also make up cell membranes. Choices: - proteins - oils - tissues - lipids A:
lipids

Q: What is the layer of electrons that encircle the nucleus at a distinct energy level called? Read this paragraph and choose the correct option from the provided answers: The Behavior of Electrons In the human body, atoms do not exist as independent entities. Rather, they are constantly reacting with other atoms to form and to break down more complex substances. To fully understand anatomy and physiology you must grasp how atoms participate in such reactions. The key is understanding the behavior of electrons. Although electrons do not follow rigid orbits a set distance away from the atom's nucleus, they do tend to stay within certain regions of space called electron shells. An electron shell is a layer of electrons that encircle the nucleus at a distinct energy level. The atoms of the elements found in the human body have from one to five electron shells, and all electron shells hold eight electrons except the first shell, which can only hold two. This configuration of electron shells is the same for all atoms. The precise number of shells depends on the number of electrons in the atom. Hydrogen and helium have just one and two electrons, respectively. If you take a look at the periodic table of the elements, you will notice that hydrogen and helium are placed alone on either sides of the top row; they are the only elements that have just one electron shell (Figure 2.7). A second shell is necessary to hold the electrons in all elements larger than hydrogen and helium. Lithium (Li), whose atomic number is 3, has three electrons. Two of these fill the first electron shell, and the third spills over into a second shell. The second electron shell can accommodate as many as eight electrons. Carbon, with its six electrons, entirely fills its first shell, and half-fills its second. With ten electrons, neon (Ne) entirely fills its two electron shells. Again, a look at the periodic table reveals that all of the elements in the second row, from lithium to neon, have just two electron shells. Atoms with more than ten electrons require more than two shells. These elements occupy the third and subsequent rows of the periodic table. Choices: - molecular shell - vortex shell - ions shell - electron shell A:
electron shell