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Anna007 [38]
3 years ago
12

What evidence of a chemical reaction might you see in the following cases?

Chemistry
1 answer:
Ad libitum [116K]3 years ago
5 0
For bleaching a stain, there will be an identifiable odor and it will easily absorb colors and/or stains. Burning a match also has odor involved, but the smoke that is released is from a hot fire that is chemically produced by the formula to make the tip of the match.
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Is air a gas? If so can it become a liquid
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Yes, it ca,n <span>if it has been cooled to very low temperatures</span>
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Which of the following is represented in the highest percentage by volume in dry air?
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A) Nitrogen Hope this helped you
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3 years ago
How many valence electrons should you use to draw a Lewis structure of ammonia (NH3)?
Mekhanik [1.2K]
Hello there,


Your correct answer would be 8.<span> There are </span>8 valence electrons<span> available for the Lewis structure for NH</span>3<span>.

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~Hottwizzlers</span>
4 0
3 years ago
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The equation shows one mole of ethanol fuel being burned in oxygen. Convert the energy released into its equivalent mass. C2H5OH
lana [24]

Answer:

47.9 g of ethanol

Explanation:

Combustion is a chemical reaction in which a substance reacts with oxygen to produce heat and light. Combustion reactions have been very useful as a source of energy. Ethanol is now burnt for energy purposes as a fuel. Ethanol has even been proposed as a possible alternative to fossil fuels.

Since 1 mole of ethanol when combusted releases 1367 kJ/mol of energy

x moles of ethanol releases 1418 kJ/mol.

x= 1 × 1418 kJ/mol/ 1367 kJ/mol

x= 1.04 moles of ethanol.

Mass of ethanol = number of moles × molar mass

Molar mass of ethanol = 46.07 g/mol

Mass of ethanol = 1.04 moles × 46.07 g/mol

Mass of ethanol= 47.9 g of ethanol

7 0
2 years ago
PLS HELP IT IS DUE TODAY IN 30 MINS PLS ANSWER 14 POINTS
Natali5045456 [20]

Answer:

gamma rays, X-rays, ultraviolet radiation, visible light, infrared radiation, and radio waves.

Explanation:

hope that helps! (:

6 0
3 years ago
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