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LuckyWell [14K]
3 years ago
13

In an exothermic reaction, energy is

Physics
2 answers:
tester [92]3 years ago
7 0

Answer: Exothermic reactions are reactions or processes that release energy, usually in the form of heat or light. In an exothermic reaction, energy is released because the total energy of the products is less than the total energy of the reactants.

Explanation:

Nutka1998 [239]3 years ago
5 0
  1. In Exothermic reaction energy is Thrown/Relased to the surroundings.
  2. In endothermic reaction, energy is absorbed from the surroundings.

Trick to identify:-

  • Exothermic reaction has +∆H sign on product side
  • Endothermic reaction has -∆H sign on product side or +∆H sign on reactant side
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Use differentials to estimate the amount of metal in a closed cylindrical can that is 10 cm high and 10 cm in diameter if the me
lana66690 [7]

Answer:

dV = 32.98 cm³

Explanation:

We know that

V = f ( h,r)

dV= \frac{\partial V}{\partial r}dr+ \frac{\partial V}{\partial h}dh

We also know that

V=\pi r^2h

dV= 2\pi h dr + \pi r^2 dh

Given that

h= 10 cm

d=10 cm ,  r= 5 cm

Thickness = 0.05 cm so  dr = 0.05 cm

The metal in the top and the bottom is 0.2 cm thick  so dh = 0.2 + 0.2 cm

dh = 0.4 cm

Now by putting the values

dV= 2\pi h dr + \pi r^2 dh

dV= 2\times \pi \times 5\times 0.05 + \pi \times 5^2\times 0.4\ cm^3

dV = 32.98 cm³

8 0
4 years ago
A motorcycle is capable of accelerating at 1.5 m/s 2. Starting from rest how far can it travel in 0.5 seconds?
Setler79 [48]

Answer:

the answer is 0 .75m

Explanation:

where are finding the distance the speed is given as well as the time..so you multiple the speed with the time thus you get the distance..i hope that's the answer..

5 0
4 years ago
Read 2 more answers
Explain why astronomers use the term "blueshifted" for objects moving toward us and "redshifted" for objects moving away from us
ValentinkaMS [17]
<span>Two of them are "redshift" and "blueshift", which are used to describe an object'smotion toward or away from us in space. Redshift indicates that an object is moving away from us. "Blueshift" is a term that astronomers use to describe an object that is moving toward another object or toward us.</span>
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3 years ago
In general, what happens to temperature as depth below earths surface increases
lesantik [10]
Temperature increases as depth increases.
8 0
3 years ago
Would u have to add Fe or can someone walk me thru this
svetoff [14.1K]
Chemical equations can be written down in 3 steps:

As example I’ll using the rusting of iron (as given)

1) Write down the products that react on the left side of the arrow.

2) Write the products after the reaction on the right side of the arrow. If there are one or more of a different atom that isn’t on the other side of the equation, the reaction is missing something on either sides.

Fe -> Fe2O3

But as you can see there are no O on the left side. The right formula is:

Fe + O2 -> Fe2O3

Review to make sure you wrote down everything.

3) Count all the atoms of each elements on each side. Balance out the amount of atoms on both sides by adding coefficients to your compounds

Take note that you need to multiply all the elements in the compound times the number

Fe + O2 -> Fe2O3

We need at least 2 iron atoms to balance out on the iron.

2Fe + O2 -> Fe2O3

Now we see that we have 2 O atoms on the left and 3 on the right. The smallest number that is divisable by both 2 and 3 is 6. Add coefficients in front of O2 and Fe2O3.

2Fe + 3O2 -> 2Fe2O3

Now we see that on the right there are 4 iron atoms. Balance out by multiplying iron on the left by 2.

4Fe + 3O2 -> 2Fe2O3

This is the final equation.
8 0
4 years ago
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