*Question*
Q: For most of a star's life, hydrogen atoms fuse to form what? Read this paragraph and choose the correct option from the provided answers: For most of a star's life, hydrogen atoms fuse to form helium atoms. A star like this is a main sequence star . The hotter a main sequence star is, the brighter it is. A star remains on the main sequence as long as it is fusing hydrogen to form helium. Choices: - neon atoms - ionic atoms - gas atoms - helium atoms A:
**Answer**
helium atoms

*Question*
Q: Noble gases are monatomic because they only contain one of what? Read this paragraph and choose the correct option from the provided answers: The Noble Gases The noble gases are helium, neon, argon, krypton, xenon, and radon. Because the noble gases are composed of only single atoms, they are monatomic. At room temperature and pressure, they are unreactive gases. Because of their lack of reactivity, for many years they were called inert gases or rare gases. However, the first chemical compounds containing the noble gases were prepared in 1962. Although the noble gases are relatively minor constituents of the atmosphere, natural gas contains substantial amounts of helium. Because of its low reactivity, argon is often used as an unreactive (inert) atmosphere for welding and in light bulbs. The red light emitted by neon in a gas discharge tube is used in neon lights. Choices: - ions - molecules - charges - atoms A:
**Answer**
atoms

*Question*
Q: Which form of electromagnetic waves have more energy: low frequency wave or high frequency waves? Read this paragraph and choose the correct option from the provided answers: The energy of electromagnetic waves depends on their frequency. Low-frequency waves have little energy and are normally harmless. High-frequency waves have a lot of energy and are potentially very harmful. Choices: - neither - low frequency waves - the same - high frequency waves A:
**Answer**
high frequency waves

*Question*
Q: What term describes a property of a liquid based on the strength of its intermolecular forces? Read this paragraph and choose the correct option from the provided answers: Because they cannot escape the container, the vapor molecules above the surface of the liquid exert a pressure on the walls of the container. The vapor pressure is a measure of the presure (force per unit area) exerted by a gas above a liquid in a sealed container. Vapor pressure is a property of a liquid based on the strength of its intermolecular forces. A liquid with weak intermolecular forces evaporates more easily and has a high vapor pressure. A liquid with stronger intermolecular forces does not evaporate easily and thus has a lower vapor pressure. For example, diethyl ether is a nonpolar liquid with weak dispersion forces. Its vapor pressure at 20C is 58.96 kPa. Water is a polar liquid whose molecules are attracted to one another by relatively strong hydrogen bonding. The vapor pressure of water at 20C is only 2.33 kPa, far less than that of diethyl ether. Choices: - analogous pressure - cellular pressure - tissue pressure - vapor pressure A:
**Answer**
vapor pressure