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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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aleksandrvk [35]

False

Explanation:

The geologic time scale which simplifies earth's long history is broad division of deep time. It consists of a large and small divisions.

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3 years ago
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Alex17521 [72]

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How many grams of HNO3 are produced when 59.0 g of NO2 completely reacts?
Anettt [7]

Answer:

53.7 grams of HNO3 will be produced

Explanation:

Step 1: Data given

Mass of NO2 = 59.0 grams

Molar mass NO2 = 46.0 g/mol

Step 2: The balanced equation

3NO2 + H2O→ 2HNO3 + NO

Step 3: Calculate moles NO2

Moles NO2 = 59.0 grams / 46.0 g/mol

Moles NO2 = 1.28 moles

Step 4: Calculate moles HNO3

For 3 moles NO2 we need 1 mol H2O to produce 2 moles HNO3 and 1 mol NO

For 1.28 moles NO2 we'll have 2/3 * 1.28 =0.853 moles HNO3

Step 7: Calculate mass HNO3

Mass HNO3 = 0.853 moles * 63.01 g/mol

Mass HNO3 = 53.7 grams

53.7 grams of HNO3 will be produced

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Answer:

F=ma

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F=m×a

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Amount of liquid measured in L or Lm
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