Ques:Answer the following question given this paragraph: Gases are compressible, meaning that when put under high pressure, the particles are forced closer to one another. This decreases the amount of empty space and reduces the volume of the gas. Gas volume is also affected by temperature. When a gas is heated, its molecules move faster and the gas expands. Because of the variation in gas volume due to pressure and temperature changes, the comparison of gas volumes must be done at one standard temperature and pressure. Standard temperature and pressure (STP) is defined as 0C (273.15 K) and 1 atm pressure. The molar volume of a gas is the volume of one mole of a gas at STP. At STP, one mole (6.02 10 23 representative particles) of any gas occupies a volume of 22.4 L ( Figure below ). Q: How do molecules react when a gas is heated? Choices: - they move slower - they disintegrate - they explode - they move faster A:

Ans:they move faster
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Ques:Answer the following question given this paragraph: Friction occurs because no surface is perfectly smooth. Even surfaces that look smooth to the unaided eye make look rough or bumpy when viewed under a microscope. Look at the metal surfaces in the Figure below . The aluminum foil is so smooth that it's shiny. However, when highly magnified, the surface of metal appears to be very bumpy. All those mountains and valleys catch and grab the mountains and valleys of any other surface that contacts the metal. This creates friction. Q: The process of microscope mountains and valleys on the surface of a material interacting with another material is called? Choices: - tension - motion - vibration - friction A:

Ans:friction
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Ques:Answer the following question given this paragraph: Other bacteria are parasitic and can cause illness. In parasitism , the bacteria benefit, and the other organism is harmed. Harmful bacteria will be discussed in another concept. Q: What would you call a relationship where the bacteria benefit and and the other organism is harmed? Choices: - pathology - fungi - symbiotic - parasitism A:

Ans:parasitism
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Ques:Answer the following question given this paragraph: The mammalian middle ear has three tiny bones that carry sound vibrations from the outer to inner ear. The bones give mammals exceptionally good hearing. In other vertebrates, the three bones are part of the jaw and not involved in hearing. Q: How many bones does the mammalian middle ear have? Choices: - two - twelve - four - three A:

Ans:
three
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