Q: Some meteorites are made of iron and nickel and are thought to be very similar to what part of the earth? Read this paragraph and choose the correct option from the provided answers: Scientists study meteorites to learn about Earth's interior. Meteorites formed in the early solar system. These objects represent early solar system materials. Some meteorites are made of iron and nickel. They are thought to be very similar to Earth's core ( Figure below ). An iron meteorite is the closest thing to a sample of the core that scientists can hold in their hands!. Choices: - crust - shelf - mantel - core A:
core

Q: Water is an oxide of what element? Read this paragraph and choose the correct option from the provided answers: Carbon dioxide is an oxide of carbon, while water is an oxide of hydrogen. Early scientists viewed oxidation as a process in which a substance was reacted with oxygen to produce one or more oxides. In the previous examples, magnesium and methane are being oxidized. Choices: - nitrogen - helium - carbon - hydrogen A:
hydrogen

Q: Wine, air, and gunpowder are all examples of what kind of common mixtures? Read this paragraph and choose the correct option from the provided answers: Wine, air, and gunpowder are other examples of common homogeneous mixtures ( Figure below ). Their exact compositions can vary, making them mixtures rather than pure substances. Wine is a liquid mixture of water, ethanol, and a variety of other dissolved substances. Air is a mixture of nitrogen gas (78%), oxygen gas (21%), and small amounts of various other gases. Gunpowder is a solid mixture comprised of potassium nitrate (75%), charcoal (15%) and sulfur (10%). Choices: - combined - contiguous - heterogeneous - homogeneous A:
homogeneous

Q: What types of energy is released during a chemical reaction? Read this paragraph and choose the correct option from the provided answers: All chemical reactions involve energy. Some chemical reactions consume energy, whereas other chemical reactions release energy. Chemical reactions can be either spontaneous, which do not require an input of energy, or non-spontaneous, which does require an input of some type of energy. Energy may be in the form of heat, light or electricity. Each of the energy changes that occur during a reaction are graphed in Figure below . In the reaction on the left, energy is released. In the reaction on the right, energy is consumed. Choices: - human, magnetic, electrical - temperature , electricity , light - magnetism, electricity, light - heat, electricity, light A:
heat, electricity, light