Ques: Answer the following question given this paragraph: Covalent bond energies can be used to estimate the enthalpy changes of chemical reactions. Q: Covalent bond energies can be used to estimate the enthalpy changes of what? Choices: - crystals reactions - Pressure reactions - liquid reactions - chemical reactions A:
Ans: chemical reactions

Ques: Answer the following question given this paragraph: Water and many other substances cannot simply diffuse across a membrane. Hydrophilic molecules, charged ions, and relatively large molecules such as glucose all need help with diffusion. The help comes from special proteins in the membrane known as transport proteins . Diffusion with the help of transport proteins is called facilitated diffusion . There are several types of transport proteins, including channel proteins and carrier proteins. Both are shown in Figure below . Q: The help with diffusion comes from special proteins in the membrane known as what? Choices: - lazy proteins - navigation proteins - installation proteins - transport proteins A:
Ans: transport proteins

Ques: Answer the following question given this paragraph: Particles of gas are constantly moving in all directions at random. As a result, they are always bumping into each other and other things. This is modeled in the Figure below . The force of the particles against things they bump into creates pressure. Pressure is defined in physics as the amount of force pushing against a given area. How much pressure a gas exerts depends on the number of gas particles in a given space and how fast they are moving. The more gas particles there are and the faster they are moving, the greater the pressure they create. To learn more about gas pressure and how to measure it, go to this URL: http://www. wisc-online. com/objects/ViewObject. aspx?ID=GCH5004 . Q: What is defined in physics as the amount of force pushing against a given area? Choices: - energy - gravity - resistance - pressure A:
Ans: pressure

Ques: Answer the following question given this paragraph: Some materials have negative heats of solution; the dissolution of one of these solutes in water is an exothermic process. Heat is released, causing a net increase in the temperature of the solution. Conversely, other substances have positive heats of solution. For example, the dissolution of potassium nitrate in water is an endothermic process. The resulting absorption of energy causes the solution to become colder. Calculations involving heats of solutions follow the same basic approach that we have used with other enthalpy problems. Q: Some materials have negative heats of solution; the dissolution of one of these solutes in water is called? Choices: - endothermic process - acetylene process - ionized process - exothermic process A:
Ans:
exothermic process