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aev [14]
4 years ago
5

What explains the fact that no machine is 100 percent efficient?

Chemistry
2 answers:
katrin2010 [14]4 years ago
8 0
The answer to this is C
const2013 [10]4 years ago
4 0
Your answer here is C.
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Look at the data in the table below. Which measurement has five significant figures?
laila [671]
D. 750 pretty sure it’s the answer
7 0
3 years ago
Does anyone know how to do this??? Calculate the % yield
eimsori [14]

Answer:

Percentage Yield = 56.9% (to 3 significant figures)

Explanation:

Firstly you need to calculate the amount of moles of Na used. Moles = Mass/Mr, so moles of Na = 1.72x10^-3/23. This gets you 7.47826087x10^-5 moles.

The mole ratio of Na:Na2O is 2:1 so the moles of Na2O will be the moles of Na divided by 2. This gets you 3.739130435x10^-5 moles.

Mass = Moles x Mr

The Mr of Na2O = 62

Mass = 3.739130435x10^-5 x 62 = 2.31826087x10^-3g

Percentage Yield = (Actual Yield / Theoretical Yield) x 100

Percentage Yield = (1.32x10^-3 / 2.31826087x10^-3) x 100

Percentage Yield = 56.93923481%

Percentage Yield = 56.9% (to 3 significant figures)

8 0
3 years ago
Which of the following elements does NOT form a diatomic molecule?
Tom [10]
Magnesium(Mg) does not forms diatomic molecules.
The name of the compound CuCl2 is copper(ll)chloride.
Hope this helps you.
5 0
4 years ago
Which best describes a swimming pool?
vesna_86 [32]

Answer:

Swimming pool is an example of solution

Explanation:

It has water (solvent) and dissolve ion (solute)

6 0
3 years ago
Read 2 more answers
Lithosphere: Odd one out . Analyze each part of the rectangle. One of the parts will be different from the others. Shade the par
patriot [66]

The characteristics of the lithosphere found that the frame that is out of sequence is:  

       last frame: Iron

The lithosphere is the upper part of the Earth, it is composed of two parts: the crust and the upper part of the mantle, up to the ionosphere, an area of ​​material in a plastic state.

The lithosphere is the most important part for since all the life processes on the planet occur in it, the depth of the lithosphere is greater in the continental part about 250 km than in the oceanic part 150 km, this is It is because it is floating above the stratosphere.

Let's analyze each part of the picture

1. Rigid rocks in the upper part of the mantle.

The lithosphere is the coldest part of the plant, which is why the rocks have solidified, forming a rigid layer of rocks that floats on the mantle.

2. Crust.

It is another name given the uppermost part of the lithosphere, it is formed by a solid area,

3. Tectonic plates.

The lower part of the lithosphere is on an area in a very hot platic state, therefore there is a thermal gradient between the convection current of the asthenosphere and the thermal conduction of the lithosphere, these thermal gradients create breaks or divisions in the upper layer that we call plate tectonics

4.) solid crust of the Earth

The lithosphere is by definition the solid part of the Earth, which is why it is also called solid crust, but not rigid.

5) Continents.  

They are the highest parts of the lithosphere, they are above the average height of the oceanic that forms the liquid part that fills the lower spaces of the lithosphere, in general it is formed by rocks of granite composition

6) Earthquakes

The plates of the lithosphere can move between it, in some cases these plates are locked (stopped) accumulating energy at some point the rocks that form part and the plates move abruptly this movement is called an earthquake

7) Volcanoes

The lower part of the lithosphere is hotter, in some parts where the upper rock is more fragile, this heat can fragment them, which is why the molten rock called magna has an exit path towards the earth's surface, in general the fragmentation processes and rupture is accompanied by high pressures that make the surface rise in height, these structures are called volcanoes, the vast majority are near the contact zone of the tectonic plates,

8) Iron  

This is a chemical element that is one of the constituents of the lithospheres, but it is not an essential part of its structure. Iron, for being a heavy element, is believed to be fundamentally in the Earth's nucleus, in the lithosphere it only forms 4.7% of its structure. This is why this box is out of sequence of the second rectangle

Consequently with the characteristics of the lithosphere found that the frame that is out of sequence is:

              last frame: Iron

learn more about lithosphere here:

brainly.com/question/14631600

5 0
3 years ago
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