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? A:

OPTIONS:
- intermolecular gravitational forces
- gravitational attractive forces
- bonding attractive forces
- intermolecular attractive forces

Answer: intermolecular attractive forces

Problem: OPTIONS:
- covalent bond element
- covalent mixture
- compound metal
- covalent network solid
Q: Answer the following question given this paragraph: One type of molecular compound behaves quite differently than that described so far. A covalent network solid is a compound in which all of the atoms are connected to one another by covalent bonds. Diamond is composed entirely of carbon atoms, each bonded to four other carbon atoms in a tetrahedral geometry. Melting a covalent network solid is not accomplished by overcoming the relatively weak intermolecular forces. Rather, all of the covalent bonds must be broken, a process that requires extremely high temperatures. Diamond, in fact, does not melt at all. Instead, it vaporizes to a gas at temperatures above 3500C. Q: What is a compound in which all of the atoms are connected to one another by covalent bonds? A:
Answer: covalent network solid

Problem:OPTIONS:
- geothermal panels
- batteries
- infrared panels
- solar panels

Answer the following question given this paragraph: Communications satellites carry solar panels to provide energy for their missions. Q: What do communication satellites carry and use to provide energy during their missions? A:
****
A: solar panels

Answer the following question given this paragraph: The size of an ocean wave depends on how fast, over how great a distance, and how long the wind blows. The greater each of these factors is, the bigger a wave will be. Some of the biggest waves occur with hurricanes. A hurricane is a storm that forms over the ocean. Its winds may blow more than 150 miles per hour! The winds also travel over long distances and may last for many days. Q: Some of the biggest waves occur with what type of storm that forms over the ocean and brings high winds? A:
OPTIONS:
- tropical depression
- tsunami
- tropical storm
- hurricane
hurricane

Answer the following question given this paragraph: The majority of amphibian species go through a larval stage that is very different from the adult form, as you can see from the frog in Figure below . The early larval, or tadpole , stage resembles a fish. It lacks legs and has a long tail, which it uses to swim. The tadpole also has gills to absorb oxygen from water. As the larva undergoes metamorphosis , it grows legs, loses its tail, and develops lungs. These changes prepare it for life on land as an adult frog. Q: What is another term for the early larval stage of a frog? A:
OPTIONS:
- young
- egg
- ovary
- tadpole

Answer: tadpole

input with options: Answer the following question given this paragraph: The distribution of darts on a dartboard shows the difference between accuracy and precision. Q: What does the distribution of darts on a dartboard shows the difference between? A:
OPTIONS:
- production and precision
- Aim and precision
- equilibrium and precision
- accuracy and precision
output:
accuracy and precision