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1 year ago

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

Chemistry

1 answer:

Dmitry_Shevchenko [17]1 year ago

7 0

Answer:

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 moles of \ce{Fe2O3}FeX 2 OX 3 will be produced from 27.0 \text{ g}27.0 g27, point, 0, start text, space, g, end tex

ira [324]

Answer : The number of moles of $Fe_2O_3$ produced will be, 0.241 moles.

Solution : Given,

Mass of Fe = 27.0 g

Molar mass of $Fe$ = 56 g/mole

First we have to calculate the moles of $Fe$ .

$\text{ Moles of }Fe=\frac{\text{ Mass of }Fe}{\text{ Molar mass of }Fe}=\frac{27.0g}{56g/mole}=0.482moles$

Now we have to calculate the moles of $Fe_2O_3$

The balanced chemical reaction is,

$4Fe+3O_2\rightarrow 2Fe_2O_3$

From the reaction, we conclude that

As, 4 mole of $Fe$ react to give 2 mole of $Fe_2O_3$

So, 0.482 moles of $Fe$ react to give $\frac{0.482}{4}\times 2=0.241$ moles of $Fe_2O_3$

Thus, the number of moles of $Fe_2O_3$ produced will be, 0.241 moles.

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2 years ago

How is thermal energy transferred between two objects that are at different temperatures?

qwelly [4]

Answer:

heat flows from the object that has more thermal more energy to the object with less thermal energy

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2 years ago

A bike lost 20% of its value after the first year, its value after the first year is $1039. Calculate the original price of the

musickatia [10]

Answer:

$1246.90

Explanation:

Since the bike lost $20%$ % of it's value and it now currently at $ $$1039$ , we have to do 20% * $1039 to find the amount of money lost. 20%*1039=207.8. We have to add it up to find the original value so 1039+207.8=$1246.8

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1 year ago

If an element has 1 valence electrons, how many dots will be in the elements dot diagram?

gayaneshka [121]

The answer is one dot.

The number of dots an element has represented in the diagram, indicates how many valence eletrons( which is the number of electrons in the most exterior energy level of an atom or ion) the element has. So, 1 valence eletron equals one dot.

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3 years ago

Read 2 more answers

I don’t really understand, if anybody can help I’ll really appreciate it ! Thank you.

Alex_Xolod [135]

Answer:

175

Explanation:

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2 years ago