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boyakko [2]
3 years ago
10

In a campfire, carbon from wood reacts with oxygen in a combustion reaction. If you’ve ever started a campfire, you know you mus

t begin by lighting small pieces of wood (called kindling) instead of logs. Likewise, as this video shows, iron filings burn in the presence of air to make iron oxide. Why do iron filings burn while a heavy iron pipe does not? Why do twigs ignite better than logs? Give your answer in terms of atoms.
Chemistry
2 answers:
hichkok12 [17]3 years ago
7 0
Increased surface area means more<span> places where </span>wood can<span> turn into flame - where heat, fuel, and oxygen </span>are<span> all in the same place at the same time. </span>The mass of a small particle is such that the entire particle can be heated<span> to ignition temperature. An </span>iron<span> rod will </span>not burn<span> as it has relatively very less surface area per unit mass </span>but iron filings<span> with more surface area per unit mass can </span>burn<span> in air and get converted to </span>iron oxide.<span>Kindling </span>or<span> smaller pieces </span>or wood <span>have a lot of surface area and therefore have </span>more<span> contact with oxygen, making them easier to burn.</span>
Alenkasestr [34]3 years ago
5 0
One thing I can tell is the fact that more surface area means more wood to burn into flames. When it starts to burn Heat, fuel, and oxygen occur in the same place at the same time to put it into flames.




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We can use these two givens to calculate the density of the liquid using the following rule:
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density = 500 / 1000 = 0.5 grams / cm^3

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Which liquid has the highest vapor pressure at 75°C?
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Answer:

1)  Ethanol

Explanation:

If we will have <u>interactions</u> we will need more <u>energy</u> to break them in order to go from liquid to gas. If we need more <u>energy</u>, therefore, the <u>temperature will be higher</u>.

In this case, we can discard the <u>propanone</u> because this molecule don't have the ability to form <u>hydrogen bonds</u>. (Let's remember that to have hydrogen bonds we need to have a hydrogen bond to a <u>heteroatom</u>, O, N, P or S).

Then we have to analyze the hydrogen bonds formed in the other molecules. For ethanol, we will have only <u>1 hydrogen bond</u>. For water and ethanoic acid, we will have <u>2 hydrogen bonds</u>, therefore, we can discard the ethanol.  

For ethanoic acid, we have 2 <u>intramolecular hydrogen bonds</u>. For water we have 2 <u>intermolecular hydrogen bonds</u>, therefore, the strongest interaction will be in the <u>ethanoic acid</u>.

The<u> closer boiling point</u> to the 75ºC is the <u>ethanol</u> (boiling point of 78.8 ºC) therefore these molecules would have <u>enough energy</u> to <u>break</u> the hydrogen bonds and to past from<u> liquid to gas</u>.

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Answer:

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To calculate the mass of CO₂ and H₂O produced, we need to know the mass of octane combusted.

We calculate the mass of Octane from the given volume and density, using the following <em>conversion factors</em>:

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Now we<u> convert 1.24 gallons to mL</u>:

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Now we use the <em>stoichiometric ratios</em> and <em>molecular weights</em> to <u>calculate the mass of CO₂ and H₂O</u>:

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Answer:

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From the description of ZCl2, only oxygen forms the compound OCl2 among the elements listed where oxygen possesses two lone pairs and each chlorine atom possesses three lone pairs each.

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