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Chemistry

Gasoline Substances and Reactions

Commercially used gasoline contains several substances. Inside the car, there are some chemical reactions that form products harmful to health and the environment. In the car engine we have: - hydrocarbon mixture - ethanol - sulfur compounds - air oxygen - air nitrogen After the reactions, the following are formed: - carbon dioxide - carbon monoxide - soot (carbon) - sulfur dioxide - carbon dioxide sulfur - gas ozone - ethanal - water - unbaked hydrocarbons - other residual compounds These compounds are released into the atmosphere.
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Chemistry

Flat Isomeria (continued)

Metameria Isomeria or Compensation This isomerization occurs between isomers that belong to the same function but differ in the position of a heteroatom in the carbon chain. The heteroatom must always be between carbons. Examples: Function Isomery Occurs when isomers belong to different functions. The most common isomers for this type of isomerism are: - alcohol and ether - aldehyde and ketone - carboxylic acid and ester Examples: - alcohol and ether: C 2 H 6 O - aldehyde and ketone: C 3 H 6 O - carboxylic acid and ester: C 4 H 8 O 2
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Chemistry

Bronsted-Lowry Theory

This theory is based on the studies of chemists Johannes Nicolaus Bronsted and Thomas Martin Lowry. Together they defined acid and base in the absence of water, which is not explained by Arrhenius's theory. The theory is based on giving or receiving 1 proton. Bronsted-Lowry Acid - is the whole chemical species that donates 1 proton.
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Chemistry

Alcohol

Alcohol is any organic substance that contains one or more oxydryl or hydroxyl (OH) groups attached directly to saturated carbon atoms. In general, a monoalcohol is represented as follows: Where: R = radical OH = oxydryl or hydroxyl Examples: cyclic alcohol aromatic alcohol Utility When we hear about alcohol, whether on TV, radio, etc.
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Physics

Acoustics Issues

Noise Intensity 1. Brazilian law prohibits the use of horns in areas near hospitals, schools and in tunnels. If a driver honks within a tunnel with a sound intensity level of 90dB, given that the default tunnel intensity is LSA. If 10 drivers honk inside a tunnel simultaneously with the same loudness, what is the loudness level inside the tunnel?
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Physics

Magnifying glass

The magnifying glass is the simplest optical observation instrument. It is also called a magnifying glass. A magnifying glass consists of a converging lens with focal length in the order of centimeters, able to combine a virtual image, direct and larger than the object. However, this instrument is effective only when the observed object is placed between the main object focus and the optical center.
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