Answer the following question given this paragraph: Because they cannot escape the container, the vapor molecules above the surface of the liquid exert a pressure on the walls of the container. The vapor pressure is a measure of the presure (force per unit area) exerted by a gas above a liquid in a sealed container. Vapor pressure is a property of a liquid based on the strength of its intermolecular forces. A liquid with weak intermolecular forces evaporates more easily and has a high vapor pressure. A liquid with stronger intermolecular forces does not evaporate easily and thus has a lower vapor pressure. For example, diethyl ether is a nonpolar liquid with weak dispersion forces. Its vapor pressure at 20C is 58.96 kPa. Water is a polar liquid whose molecules are attracted to one another by relatively strong hydrogen bonding. The vapor pressure of water at 20C is only 2.33 kPa, far less than that of diethyl ether. Q: What term describes a property of a liquid based on the strength of its intermolecular forces? Choices: - analogous pressure - cellular pressure - tissue pressure - vapor pressure A:
vapor pressure
Answer the following question given this paragraph: When light passes from one medium to another, it changes speed. For example, when light passes from air to glass, it slows down. If light strikes a sheet of glass at a 90 angle, or perpendicular to the glass, it slows down but still passes straight through the glass. However, if light enters the glass at an angle other than 90, the light bends as it slows down. The bending of light as it changes speed in a new medium is called refraction . The Figure below shows how refraction occurs. Notice that the speed of light changes again as it passes from the glass back to the air. In this case, the speed increases, and the ray of light resumes its initial direction. For a more detailed explanation of refraction, watch this video: http://www. youtube. com/watch?v=8RM46yvDOHI . Q: When light passes from one medium to another, it changes what? Choices: - color - temperature - density - speed A:
speed
Q: Answer the following question given this paragraph: The ostrich egg - unfertilized, of course. Yes, this egg, just like a human ovum, is just one cell. The egg shell membrane encloses the nucleus containing the genetic material and the cytoplasm. Q: What part of an egg contains the genetic material ? Choices: - the sperm - the fetus - here.the nucleus - the nucleus A:
A: the nucleus
Question: Answer the following question given this paragraph: Hundreds of species of birds have gone extinct as a result of human actions. A well-known example is the passenger pigeon. It was once the most common bird in North America, but over-hunting and habitat destruction led to its extinction in the 1800s. Habitat destruction and use of the pesticide DDT explain the recent extinction of the dusky seaside sparrow. This native Florida bird was declared extinct in 1990. Q: Which single most factor is responsible for the extinction of hundreds of species of birds? Choices: - diet - animal actions - habitat - human actions A:
Answer: human actions
*Question*
Answer the following question given this paragraph: Q: Like birds, most other reptiles excrete their nitrogenous wastes as what acid? Choices: - hydrochloric - sulphuric - lactic - uric A:
**Answer**
uric
(Question)
Answer the following question given this paragraph: Thunderstorms are are known for their heavy rains and lightning. In strong thunderstorms, hail and high winds are also likely. Thunderstorms are very common. Worldwide, there are about 14 million of them each year! In the U. S. , they are most common and strongest in the Midwest. Q: About how many thunderstorms are there each year worldwide? Choices: - 21 million - 17 million - 23 million - 14 million A:
(Answer)
14 million