Ques:Q: Chemical reactions follow which laws? Read this paragraph and choose the correct option from the provided answers: Chemical reactions follow the laws of thermodynamics. The First Law of Thermodynamics states that energy can be changed from one form to another, but it cannot be created or destroyed. This law is also known as the Law of Conservation of Energy. The Second Law of Thermodynamics states the energy available after a chemical reaction is always less than that at the beginning of a reaction. This is also commonly referred to as entropy. Entropy can be described as the degree of disorder in a system . That is, as energy is transferred from one form to another, some of the energy is lost as heat, and the amount of available energy decreases. As the energy decreases, the disorder in the system increases, and, by definition, the entropy increases. Ice melting provides an example in which entropy increases. Entropy essentially is a measure of the tendency of a process, such as a chemical reaction, to proceed in a particular direction. Choices: - Physics Analysis - Chemical kinetics - Archie's law - thermodynamics A:

Ans:thermodynamics
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Ques:Q: What length of time is human gestation commonly divided into? Read this paragraph and choose the correct option from the provided answers: Choices: - two halves - fifty weeks - four quarters - three trimesters A:

Ans:three trimesters
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Ques:Q: Conductivity, oxidation state and physical appearance are properties that help determine whether what are metals? Read this paragraph and choose the correct option from the provided answers: Strategy: A Based on the conductivity of the elements, determine whether each is a metal, a nonmetal, or a semimetal. Confirm your prediction from its physical appearance. B From the compounds each element forms, determine its common oxidation states. C If the element is a nonmetal, it must be located in the p block of the periodic table. If a semimetal, it must lie along the diagonal line of semimetals from B to At. Transition metals can have two oxidation states separated by one electron. D From your classification, the oxidation states of the element, and its physical appearance, deduce its identity. Solution:. Choices: - atoms - phases - organisms - elements A:

Ans:elements
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Ques:Q: The distance between two consecutive z discs or z lines is called what? Read this paragraph and choose the correct option from the provided answers: When a sarcomere shortens, some regions shorten whereas others stay the same length. A sarcomere is defined as the distance between two consecutive Z discs or Z lines; when a muscle contracts, the distance between the Z discs is reduced. The H zonethe central region of the A zonecontains only thick filaments and is shortened during contraction. The I band contains only thin filaments and also shortens. The A band does not shortenit remains the same lengthbut A bands of different sarcomeres move closer together during contraction, eventually disappearing. Thin filaments are pulled by the thick filaments toward the center of the sarcomere until the Z discs approach the thick filaments. The zone of overlap, in which thin filaments and thick filaments occupy the same area, increases as the thin filaments move inward. Choices: - contractile - ligule - radius - sarcomere A:

Ans:
sarcomere
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