Answer the following question given this paragraph: Each day, hundreds of weather balloons are launched. Made of a synthetic rubber and carrying a box of instruments, the helium-filled balloon rises up into the sky. As it gains altitude, the atmospheric pressure becomes less and the balloon expands. At some point the balloon bursts due to the expansion, the instruments drop (aided by a parachute) to be retrieved and studied for information about the weather. Q: Why will water balloons launched into the air eventually burst? Choices: - heat - momentum - friction - expansion A:
expansion
Answer the following question given this paragraph: Liquefaction of Gases Liquefaction of gases is the condensation of gases into a liquid form, which is neither anticipated nor explained by the kinetic molecular theory of gases. Both the theory and the ideal gas law predict that gases compressed to very high pressures and cooled to very low temperatures should still behave like gases, albeit cold, dense ones. As gases are compressed and cooled, however, they invariably condense to form liquids, although very low temperatures are needed to liquefy light elements such as helium (for He, 4.2 K at 1 atm pressure). Liquefaction can be viewed as an extreme deviation from ideal gas behavior. It occurs when the molecules of a gas are cooled to the point where they no longer possess sufficient kinetic energy to overcome intermolecular attractive forces. The precise combination of temperature and pressure needed to liquefy a gas depends strongly on its molar mass and structure, with heavier and more complex molecules usually liquefying at higher temperatures. In general, substances with large van der Waals acoefficients are relatively easy to liquefy because large a coefficients indicate relatively strong intermolecular attractive interactions. Conversely, small molecules with only light elements have small a coefficients, indicating weak intermolecular interactions, and they are relatively difficult to liquefy. Gas liquefaction is used on a massive scale to separate O2, N2, Ar, Ne, Kr, and Xe. After a sample of air is liquefied, the mixture is. Q: Liquefaction ccurs when the molecules of a gas are cooled to the point where they no longer possess sufficient kinetic energy to overcome what? Choices: - intermolecular gravitational forces - gravitational attractive forces - bonding attractive forces - intermolecular attractive forces A:
intermolecular attractive forces
Q: Answer the following question given this paragraph: Flatworms have an incomplete digestive system. This means that the digestive tract has only one opening. Digestion takes place in the gastrovascular cavity. Q: Where does digestion take place within an incomplete digestive system? Choices: - lumbar region - abdomen - central nervous system - gastrovascular cavity A:
A: gastrovascular cavity
Question: Answer the following question given this paragraph: Mercury(II) oxide is a red solid. When it is heated, it decomposes into mercury metal and oxygen gas. Q: What is the color of mercury oxide? Choices: - yellow - orange - green - red A:
Answer: red
*Question*
Answer the following question given this paragraph: Renewable resources are natural resources that are remade by natural processes as quickly as people use them. Examples of renewable resources include sunlight and wind. They are in no danger of being used up. Metals and some other minerals are considered renewable as well because they are not destroyed when they are used. Instead, they can be recycled and used over and over again. Q: What do we call natural resources that are remade by natural processes as quickly as people use them? Choices: - nonrenewable - exotic - geothermal - renewable A:
**Answer**
renewable
*Question*
Answer the following question given this paragraph: Mendel summarized his findings in two laws: the Law of Segregation and the Law of Independent Assortment. The Law of Segregation is based on his findings from his first set of experiments. Mendel stated that heritable factors are segregated during gamete formation. More precisely, this law states that a pair of alleles is separated, or segregated, during the formation of gametes. During meiosis, homologous chromosomes are randomly separated. Each resulting gamete has an equal probability or chance of receiving either of the two alleles. In other words, each gamete has only one allele for each gene. Q: Which law states that a pair of alleles is separated, or segregated, during the formation of gametes? Choices: - de facto segregation - law of equals - separation anxiety - law of segregation A:
**Answer**
law of segregation