Q: Q: What is the name for compounds that contain only carbon and hydrogen? Read this paragraph and choose the correct option from the provided answers: The fuel that burns in a combustion reaction contains compounds called hydrocarbons. Hydrocarbons are compounds that contain only carbon (C) and hydrogen (H). The charcoal pictured in the Figure above consists of hydrocarbons. So do fossil fuels such as natural gas. Natural gas is a fuel that is commonly used in home furnaces and gas stoves. The main component of natural gas is the hydrocarbon called methane (CH 4 ). You can see a methane flame in the Figure below . The combustion of methane is represented by the equation:. Choices: - particles - carbohydrates - carbides - hydrocarbons A:
A: hydrocarbons

Q: Q: What is the main form of energy storage in plants? Read this paragraph and choose the correct option from the provided answers: Many simple sugars can combine by repeated condensation reactions until a very large molecule is formed. A polysaccharide is a complex carbohydrate polymer formed from the linkage of many monosaccharide monomers. One of the best known polysaccharides is starch, the main form of energy storage in plants. Starch is a staple in most human diets. Foods such as corn, potatoes, rice, and wheat have high starch contents. Starch is made of glucose monomers and occurs in both straight-chain and branched forms. Amylose is the straight-chain form and consists of hundreds of linked glucose molecules. The branched form of starch is called amylopectin. In the small intestine, starch is hydrolyzed to form glucose. The glucose can then be converted to biochemical energy or stored for later use. Choices: - nitrogen - dioxide - liquid - starch A:
A: starch

Q: Q: What objects are made from highly reflective metal that is applied to a curved or flat piece of glass? Read this paragraph and choose the correct option from the provided answers: Mirrors are made from highly reflective metal that is applied to a curved or flat piece of glass. Converging mirrors can be used to focus light headlights, telescopes, satellite TV receivers, and solar cookers all rely on this principle. Like lenses, mirrors can create images. Choices: - frames - vases - machines - mirrors A:
A: mirrors

Q: Q: Smoking increases the risk of cancer from what radioactive gas that can also be detected with a test kit for your home? Read this paragraph and choose the correct option from the provided answers: Radon is also radioactive and can easily be inhaled into the lungs. Over time, this internal radon exposure can lead to the development of lung cancer. The incidence of lung cancer in smokers exposed to radon is much higher than that in non-smokers exposed to radon since smoking has already produced some lung damage, and the radon simply makes the damage worse. Radon exposure is highest in homes lacking good air circulation to move the gas out of the residence. There are a number of inexpensive approaches to decreasing your exposure to radon. A good start is to test your living area for radon with a radon test kit. Choices: - arsenic - carbon monoxide - carbon dioxide - radon A:
A: radon