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Alex Ar [27]
2 years ago
11

Pls Help this is my last question on the quiz - Which two types of energies involve changes in atoms or atom rearrangement?

Chemistry
1 answer:
Vera_Pavlovna [14]2 years ago
7 0

Answer:

Sound & Mechanical (i think)

Explanation:

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How do you do this problem?
Svetradugi [14.3K]

Answer:

B

Explanation:

If the temperature of the water goes up, the reaction is exothermic (heat is being given away by the equation -- more precisely the reactants of the equation). Only A and B can be true. In order for the reaction to occur, the water has to absorb the heat. It's temperature goes up. Remember that minus sign. It is almost the key fact for this question.

The question is not as hard as it looks, but that is easy for me to say.

m = 100 g

c = 4.2 J/(g * oC)

deltaT = 21 - 20 degrees = 1 degree.

Heat = 100 * 4.2 * 1

Heat = 420 J

Heat = 420 * [1 kJ/1000 J]

Heat = -0.42 kJ

B

8 0
3 years ago
What type of energy is carried by electrical charges as they move in a circuit?
Usimov [2.4K]
B. Electrical energy
3 0
2 years ago
Name three uses of satellite that effect every day?
fomenos
GPS- Global Positioning System, this is be found in cars
Google Maps- Finding the nearest Starbux, the map is generated by satellite data.
Phone calls and text messages- the signals go from your phone to the satellite and back down to whoever you're texting.

Hope this helps :)
8 0
3 years ago
A titanium cube contains 3.10•10^23 atoms. The density of a titanium is 4.50g/cm^3. What is the edge length of the cube?
Lerok [7]

Answer:

1.76cm

Explanation:

We'll begin by calculating the mass of titanium that contain 3.10x10²³ atoms. This can be obtained as follow:

From Avogadro's hypothesis, we understood that 1 mole of any substance contains 6.02x10²³ atoms. This implies that 1 mole of titanium also contains 6.02x10²³ atoms.

1 mole of titanium = 48g

Now, if 48g of titanium contains 6.02x10²³ atoms,

Then Xg of titanium will contain 3.10x10²³ atoms i.e

Xg of titanium = (48x3.10x10²³)/6.02x10²³

Xg of titanium = 24.72g

Next, we shall determine the volume of the titanium. This is illustrated below:

Density of titanium = 4.50g/cm³

Mass of titanium = 24.72g

Volume of titanium =..?

Density = Mass /volume

Volume = Mass /Density

Volume of titanium = 24.72g/4.50g/cm³

Volume of titanium = 5.49cm³

Finally we shall determine the edge length of the titanium cube as follow:

Volume = L³

5.49cm³ = L³

Take the cube root of both side

L = 3√(5.49cm³)

L = 1.76cm

Therefore, the edge length is 1.76cm

5 0
2 years ago
Charlie is doing a scientific investigation about the properties of light energy. For his experiment, he points a flashlight at
matrenka [14]

Answer:

it would be A.

Explanation:

7 0
3 years ago
Read 2 more answers
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