read the passage.\ngases can be chemically active or inactive. this means that a gas either reacts or does…

read the passage.\ngases can be chemically active or inactive. this means that a gas either reacts or does not react when combined with other elements.\na definition of a noble gas is a gas that does not combine easily with other elements. an example of a noble gas is helium. a protective\nlayer of helium prevents reactions with other elements such as oxygen.\nhelium has a very low density. it is used daily in weather balloons to carry instruments that record temperature, humidity, and\npressure readings in the atmosphere.\npeople with breathing problems may be treated with a mixture of helium and oxygen. helium atoms are small and light. a helium-\noxygen mixture can be pumped in and out of the lungs more easily than air. helium - oxygen mixtures are also used in breathing tanks of deep -\nsea divers.\nusing information from the passage, which statement is accurate?\n1. a noble gas mixes well with other elements.\n2. gases usually are chemically active.\n3. helium is an example of a chemically inactive gas.\n4. helium - oxygen mixtures are used in weather balloons.

read the passage.\ngases can be chemically active or inactive. this means that a gas either reacts or does not react when combined with other elements.\na definition of a noble gas is a gas that does not combine easily with other elements. an example of a noble gas is helium. a protective\nlayer of helium prevents reactions with other elements such as oxygen.\nhelium has a very low density. it is used daily in weather balloons to carry instruments that record temperature, humidity, and\npressure readings in the atmosphere.\npeople with breathing problems may be treated with a mixture of helium and oxygen. helium atoms are small and light. a helium-\noxygen mixture can be pumped in and out of the lungs more easily than air. helium - oxygen mixtures are also used in breathing tanks of deep -\nsea divers.\nusing information from the passage, which statement is accurate?\n1. a noble gas mixes well with other elements.\n2. gases usually are chemically active.\n3. helium is an example of a chemically inactive gas.\n4. helium - oxygen mixtures are used in weather balloons.

Answer

Brief Explanations:

The passage defines a noble gas as one that doesn't combine easily with other elements and gives helium as an example. This means helium is chemically inactive. Option 1 is wrong as noble gases don't mix well. The passage doesn't say gases are usually active, so Option 2 is incorrect. Helium - oxygen mixtures are for breathing problems and deep - sea divers, not weather balloons, so Option 4 is wrong.

Answer:

  1. Helium is an example of a chemically inactive gas.