Ques:Answer the following question given this paragraph: Have your parents ever put corn in the gas tank of their car? They did if they used gas containing ethanol. Ethanol is produced by alcoholic fermentation of the glucose in corn or other plants. This type of fermentation also explains why bread dough rises. Yeasts in bread dough use alcoholic fermentation and produce carbon dioxide gas. The gas forms bubbles in the dough, which cause the dough to expand. The bubbles also leave small holes in the bread after it bakes, making the bread light and fluffy. Do you see the small holes in the slice of bread in Figure below ?. Q: What type of gas is produced by alcoholic fermentation of the glucose in corn or other plants? Choices: - methanol - ethyl - isopropyl - ethanol A:

Ans:ethanol
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Ques:Answer the following question given this paragraph: Having polar bonds may make a covalent compound polar. A polar compound is one in which there is a slight difference in charge between opposite ends of the molecule. All polar compounds contain polar bonds. But having polar bonds does not necessarily result in a polar compound. It depends on how the atoms are arranged. This is illustrated in Figure below . Both molecules in the figure contain polar bonds, but only formaldehyde is a polar compound. Why is carbon dioxide nonpolar?. Q: Having polar bonds may make a covalent compound what? Choices: - ionic - negatively charged - neutral - polar A:

Ans:polar
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Ques:Answer the following question given this paragraph: Polyisoprene is a polymer of isoprene and is better known as rubber. It is produced naturally by rubber trees, but several variants have been developed which demonstrate improvements on the properties of natural rubber. Q: What is polyisoprene better known as? Choices: - rayon - styrofoam - silicon - rubber A:

Ans:rubber
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Ques:Answer the following question given this paragraph: Skydivers are pulled towards the Earth by gravity. Gravity exerts a force on the skydivers. A force is a push or pull. Some pushes and pulls can be seen. Q: What pulls skydivers towards the earth? Choices: - momentum - impact - inertia - gravity A:

Ans:
gravity
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