Ques: Q: Which important decomposers are known to live just about anywhere on earth? Read this paragraph and choose the correct option from the provided answers: Archaeans are now known to live just about everywhere on Earth. They are important decomposers. Many live in close relationships with other organisms. They are generally harmless and often beneficial. Choices: - protazoas - viruses - sporozoans - archeans A:
Ans: archeans

Ques: Q: In police radar, a radar gun sends out short bursts of which waves? Read this paragraph and choose the correct option from the provided answers: Radar stands for ra dio d etection and r anging. In police radar, a radar gun sends out short bursts of microwaves. The microwaves reflect back from oncoming vehicles and are detected by a receiver in the radar gun. The frequency of the reflected waves is used to compute the speed of the vehicles. Radar is also used for tracking storms, detecting air traffic, and other purposes. Choices: - photons - soundwaves - electrodes - microwaves A:
Ans: microwaves

Ques: 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? Read this paragraph and choose the correct option from the provided answers: 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. Choices: - intermolecular gravitational forces - gravitational attractive forces - bonding attractive forces - intermolecular attractive forces A:
Ans: intermolecular attractive forces

Ques: Q: What is the name for the energy required for an electron to be added to a neutral atom in its gaseous form? Read this paragraph and choose the correct option from the provided answers: Electron affinity is the energy required for an electron to be added to a neutral atom in its gaseous form. Because most atoms release energy when an electron is added, most electron affinity values are negative. These values generally become more negative (more energy is released) as you move left to right across the table or from bottom to top. Choices: - mass affinity - neutron affinity - photon affinity - electron affinity A:
Ans:
electron affinity