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Amiraneli [1.4K]
3 years ago
10

What is the kinetic energy of a 1.0-kg billiard ball that moves at 5.0 m/s?

Chemistry
1 answer:
bekas [8.4K]3 years ago
8 0
Given,
          m = 1 kg
          v = 5 m/s 
We know that 
              K.E.= mv²/2
                     =1×5²/2
                     =25/2
                     =12.5 Joules
The answer is 12.5 Joules
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4.2g of sodium bicarbonate is equivalent to how many moles of sodium bicarbonate
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<span>The mass of one mole of sodium bicarbonate (aka NaHCO3) is equal to 1 * 22.99g/mol + 1 * 1.00g/mol + 1 * 12.01g/mol + 3 * 16.00g/mol = 83.91g/mol. From this, we can convert 4.2g of NaHCO3 to moles by dividing by 83.91g/mol, to get 0.050 moles of sodium bicarbonate.</span>
7 0
3 years ago
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A sealed 1.0L flask is filled with 0.500 mols of I_2 and 0.500 mols of Br_2. When the container achieves equilibrium the equilib
DochEvi [55]

Answer:

[IBr] = 0.049 M.

Explanation:

Hello there!

In this case, according to the balanced chemical reaction:

I_2+Br_2\rightarrow 2IBr

It is possible to set up the following equilibrium expression:

K=\frac{[IBr]^2}{[I_2][Br_2]} =0.0110

Whereas the the initial concentrations of both iodine and bromine are 0.50 M; and in terms of x (reaction extent) would be:

0.0110=\frac{(2x)^2}{(0.50-x)^2}

Which can be solved for x to obtain two possible results:

x_1=-0.0277M\\\\x_2=0.0245M

Whereas the correct result is 0.0245 M since negative results does not make any sense. Thus, the concentration of the product turns out:

[IBr]=2x=2*0.0249M=0.049M

Regards!

7 0
2 years ago
Pls help ASAP........ A student was roasting marshmallows over a fire. The student
Phantasy [73]

Answer:

A chemical change

Explanation:

The marshmallow turning brown and bubbling implies that a chemical change has taken place.

For chemical changes to occur, we observe any of the following:

  • a new kind of matter is formed.
  • it is always accompanied by energy changes
  • the process is not easily reversible
  • it involves a change in mass
  • requires considerable amount of energy.

ii. Two signs that shows a chemical change has taken place is that:

  • bubbles are being formed as it is roasted and it implies that new substances have been formed.
  • also, significant amount of heat energy is supplied for the roasting.
5 0
3 years ago
Which of the following is the best explanation for why finches on one of the islands in the Galapagos have large beaks while fin
swat32

Answer:

The correct answer is A)

Overtime, the finches on the island adapted as a result of competition for resources.

Explanation:

The finches beaks adapted to the food source which was favored by natural selection. The successful finches that had the most useful beak for their island survived and therefore reproduced.

Cheers!

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3 years ago
How many iron atoms are there in 2.50moles of each of the following? FeWO4 =? Atoms of Fe
oksano4ka [1.4K]
<span>Avogadro's number represents the number of units in one mole of any substance. This has the value of 6.022 x 10^23 units / mole. This number can be used to convert the number of atoms or molecules into number of moles. Calculations are as follows:

 </span>2.50 mol FeWO4 ( 1 mol Fe / 1 mol FeWO4 ) ( <span>6.022 x 10^23 atoms Fe / 1 mol Fe )</span>= 1.51 x 10^24 atoms Fe
4 0
3 years ago
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