Q: What are the gas giants mostly made of . Read this paragraph and choose the correct option from the provided answers: The gas giants are mostly made of hydrogen and helium. These are the same elements that make up most of the Sun. Astronomers think that most of the nebula was hydrogen and helium. The inner planets lost these very light gases. Their gravity was too low to keep them and they floated away into space. The Sun and the outer planets had enough gravity to keep the hydrogen and helium. Choices: - calcium and helium - nitrogen and helium - hydrogen and carbon - hydrogen and helium A:
hydrogen and helium

Q: Another name for table salt is? Read this paragraph and choose the correct option from the provided answers: The table salt pictured in the Figure below contains two elements that are so reactive they are rarely found alone in nature. Instead, they undergo chemical reactions with other elements and form compounds. Table salt is the compound named sodium chloride (NaCl). It forms when an atom of sodium (Na) gives up an electron and an atom of chlorine (Cl) accepts it. When this happens, sodium becomes a positively charged ion (Na + ), and chlorine becomes a negatively charged ion (Cl - ). The two ions are attracted to each and join a matrix of interlocking sodium and chloride ions, forming a crystal of salt. Choices: - hydrogen chloride - carbon chloride - dioxide chloride - sodium chloride A:
sodium chloride

Q: How do most plants create food? Read this paragraph and choose the correct option from the provided answers: Plants are multicellular eukaryotes. They have organelles called chloroplasts and cell walls made of cellulose. Plants also have specialized reproductive organs. Almost all plants make food by photosynthesis. Life as we know it would not be possible without plants. Choices: - electrolysis - atherosclerosis - glycolysis - photosynthesis A:
photosynthesis

Q: The periodic table is one of the cornerstones of chemistry because it organizes all the known elements on the basis of their what? Read this paragraph and choose the correct option from the provided answers: The periodic table is one of the cornerstones of chemistry because it organizes all the known elements on the basis of their chemical properties. A modern version is shown in Figure 2.7 "A Modern Periodic Table". Most periodic tables provide additional data (such as atomic mass) in a box that contains each element's symbol. The elements are listed in order of atomic number. Choices: - size properties - liquid properties - acid properties - chemical properties A:
chemical properties