Question: Answer the following question given this paragraph: Even compounds with the same number of carbon and hydrogen atoms can have different shapes. These compounds are called isomers . Look at the examples in Figure below . The figure shows the structural formulas of butane and its isomer iso -butane. Both molecules have four carbon atoms and ten hydrogen atoms (C 4 H 10 ), but the atoms are arranged differently. Butane is a straight-chain molecule. Iso -butane is branched. You can see three-dimensional models of these two isomers at the URLs below. You can rotate the molecule models to get a better idea of their shapes. Q: What are compounds with the same number of carbon and hydrogen atoms called? Choices: - alcohols - hydrocarbons - monomers - isomers A:
Answer: isomers

Question: Answer the following question given this paragraph: Water is essential to life because biochemical reactions take place in water. Most people can survive only a few days without water. Q: Most people can survive only a few days without what essential substance? Choices: - air - food - carbon - water A:
Answer: water

Question: Answer the following question given this paragraph: Some of them are inorganic . Inorganic materials are made from non-living substances like pebbles and sand. Q: Materials made from non-living substances like pebbles and sand are called what? Choices: - microscopic - fibrous - organic - inorganic A:
Answer:
inorganic