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attashe74 [19]
2 years ago
15

Science edpuzzle All of the following describe a chemical change, EXCEPT…

Chemistry
1 answer:
Dmitry_Shevchenko [17]2 years ago
7 0

Answer:

B

Explanation:

You might want to pick "A sound is created" No that answer is just fine. If you listen when sitting around a campfire, you might hear the crackling of what is burning. Burning is an excellent example of a chemical change. Wood becomes ash.

The answer is a change in the state of matter. (B). That need not indicate a chemical change. In fact, most of the time, a change in matter is a physical change.

Answer: B

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How many grams of water (H2O) will be produced from 96.0 grams of oxygen (O2)?
jekas [21]

Answer & Explenation:

2H2 + O2 -> 2H20 is the balanced equation for the reaction of Hydrogen with Oxygen to form water so

If you have 32g of O2 this is a simple Dimensional analysis problem

32g O2 x 36.03056g H20/31.9988g O2 this way the O2 cancels out and you are left with just the H2O so your raw answer would be 36.0319112, then if your instructor requires a significant figure answer that would be to 2 significant figures the information you were given 32g O2, so as above 36g or Water are produced. Just a different way to view and solve the problem with the balanced equation so you can see the way everything relates to everything else. the molar masses of O2 and H2O are simply found my adding up 2 Oxygens 15.9994g x2 = 31.9988g and H2O = 2(1.00794) + 15.9994 = 18.01258 but you then have to multiply that by 2 because the reaction states you get 2 mols in the reaction so that is where I came up with the 36.03056g for the solution. Hope this helps. Dimensional Analysis is and can be one of the best ways to solve these problems, because not always are you going to be dealing with 1:2 ratios.

4 0
3 years ago
the pressure of 5.0 L of gas increases from 1.50atm to 1240 mmgh. what is the final volume of the gas, assuming no change in mol
NikAS [45]

Answer:

V₂ = 4.7 L

Explanation:

Given data:

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Final volume = ?

Solution:

P₁V₁ = P₂V₂

V₂ = P₁V₁ / P₂

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Answer:

its A

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Kisachek [45]

Answer:

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Explanation:

Percent yield is defined as one hundred times the ratio between actual yield and theoretical yield. The expression is:

Percent yield = Actual Yield / Theoretical Yield * 100

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Percent yield is 80.0%.

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<h3>Theoretical yield = 3.75g</h3>
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3 years ago
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