Answer the following question given this paragraph: Some unstable acids decompose to produce nonmetal oxides and water. Carbonic acid decomposes easily at room temperature into carbon dioxide and water. Q: Carbonic acid decomposes easily at room temperature into carbon dioxide and what else? Choices: - gas - oxygen - helium - water A:
water
Answer the following question given this paragraph: Exergonic c. Decomposition d. Catabolic, exergonic, and decomposition 18. Which of the following combinations of atoms is most likely to result in a chemical reaction? a. hydrogen and hydrogen b. hydrogen and helium c. helium and helium d. neon and helium 19. Chewing a bite of bread mixes it with saliva and facilitates its chemical breakdown. This is most likely due to the fact that ________. the inside of the mouth maintains a very high temperature b. chewing stores potential energy c. chewing facilitates synthesis reactions d. saliva contains enzymes 20. CH4 is methane. This compound is ________. Q: Chewing a bite of bread mixes it with what and facilitates its chemical breakdown? Choices: - chyme - calcium - interstitial fluid - saliva A:
saliva
Q: Answer the following question given this paragraph: Only when a lower energy level is full are electrons added to the next higher energy level. Electrons at higher energy levels, which are farther from the nucleus, have more energy. They also have more orbitals and greater possible numbers of electrons. Q: When a lower energy level is ______ electrons are added to the next higher energy level. Choices: - unbalanced - ready - empty - full A:
A: full
Question: Answer the following question given this paragraph: Electron Shells and the Bohr Model It should be stressed that there is a connection between the number of protons in an element, the atomic number that distinguishes one element from another, and the number of electrons it has. In all electrically neutral atoms, the number of electrons is the same as the number of protons. Thus, each element, at least when electrically neutral, has a characteristic number of electrons equal to its atomic number. An early model of the atom was developed in 1913 by Danish scientist Niels Bohr (18851962). The Bohr model shows the atom as a central nucleus containing protons and neutrons, with the electrons in circular orbitals at specific distances from the nucleus, as illustrated in Figure 2.6. These orbits form electron shells or energy levels, which are a way of visualizing the number of electrons in the outermost shells. These energy levels are designated by a number and the symbol "n. " For example, 1n represents the first energy level located closest to the nucleus. Q: What is the number of electrons equal to in every electrically neutral atom? Choices: - Electrons - molecules - nucleus - protons A:
Answer: protons
*Question*
Answer the following question given this paragraph: Another example of a thermal insulator is pictured in the Figure below . The picture shows fluffy pink insulation inside the attic of a home. Like the down filling in a snowsuit, the insulation traps a lot of air. The insulation helps to prevent the transfer of thermal energy into the house on hot days and out of the house on cold days. Other materials that are thermal insulators include plastic and wood. That's why pot handles and cooking utensils are often made of these materials. Notice that the outside of the toaster pictured in the opening image is made of plastic. The plastic casing helps prevent the transfer of thermal energy from the heating element inside to the outer surface of the toaster where it could cause burns. You can learn more about thermal insulators at this URL: http://www. school-for-champions. com/science/thermal_insulation. htm . Q: What is the name for a material that prevents the transfer of heat energy? Choices: - physical insulator - structure insulator - thermal condenser - thermal insulator A:
**Answer**
thermal insulator
Answer the following question given this paragraph: Because energy is a product, energy is given off by the reaction. Therefore, this reaction is exothermic. Because energy is a reactant, energy is absorbed by the reaction. Therefore, this reaction is endothermic. Q: In an endothermic reaction, what is absorbed by the reaction? Choices: - food - fuel - atoms - energy A:
energy