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Lady bird [3.3K]
3 years ago
13

Explain if the efficiency of a machine can ever be greater than 100%?

Chemistry
2 answers:
Zarrin [17]3 years ago
7 0
No because a 100% efficiency means the machine is working at its best.
Marizza181 [45]3 years ago
3 0
You should download Socratic with a good app!
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It takes a slug 20 minutes to travel from the grass to the trash can, a trip of 15 meters. How far could the slug travel in 60 m
ruslelena [56]

Answer:

45 meters

Explanation:

If it takes the slug 20 minutes to travel 15 meters, you multiply the 15 by three to get the distance for 60 minutes.

4 0
3 years ago
Describe the process of crystallization.
dalvyx [7]
Crystallization is a process where a solid forms into a substance we call crystal, this happens from precipitating from a solution, freezing, and more
4 0
2 years ago
Consider the following chemical reaction: CO (g) + 2H2(g) ↔ CH3OH(g) At equilibrium in a particular experiment, the concentratio
grigory [225]

Answer : The equilibrium concentration of CH_3OH will be, (C) 2.82\times 10^{-1}

Explanation :  Given,

Equilibrium constant = 14.5

Concentration of CO at equilibrium = 0.15 M

Concentration of H_2 at equilibrium = 0.36 M

The balanced equilibrium reaction is,

CO(g)+2H_2(g)\rightleftharpoons CH_3OH(g)

The expression of equilibrium constant for the reaction will be:

K_c=\frac{[CH_3OH]}{[CO][H_2]^2}

Now put all the values in this expression, we get:

14.5=\frac{[CH_3OH]}{(0.15)\times (0.36)^2}

[CH_3OH]=2.82\times 10^{-1}M

Therefore, the equilibrium concentration of CH_3OH will be, (C) 2.82\times 10^{-1}

5 0
3 years ago
Copper crystallizes in a face-centered cubic unit cell. the density of copper is 8.94 g/cm3. calculate the length of the edge of
Ilia_Sergeevich [38]
<span>361.4 pm is the length of the edge of the unit cell. First, let's calculate the average volume each atom is taking. Start with calculating how many moles of copper we have in a cubic centimeter by looking up the atomic weight. Atomic weight copper = 63.546 Now divide the mass by the atomic weight, getting 8.94 g / 63.546 g/mol = 0.140685488 mol And multiply by Avogadro's number to get the number of atoms: 0.140685488 * 6.022140857x10^23 = 8.472278233x10^22 Now examine the face-centered cubic unit cell to see how many atoms worth of space it consumes. There is 1 atom at each of the 8 corners and each of those atoms is shared between 8 unit cells for for a space consumption of 8/8 = 1 atom. And there are 6 faces, each with an atom in the center, each of which is shared between 2 unit cells for a space consumption of 6/2 = 3 atoms. So each unit cell consumes as much space as 4 atoms. Let's divide the number of atoms in that cubic centimeter by 4 to determine the number of unit cells in that volume. 8.472278233x10^22 / 4 = 2.118069558x10^22 Now calculate the volume each unit cell occupies. 1 cm^3 / 2.118069558x10^22 = 4.721280262x10^-23 cm^3 Let's get the cube root to get the length of an edge. (4.721280262x10^-23 cm^3)^(1/3) = 3.61426x10^-08 cm Now let's convert from cm to pm. 3.61426x10^-08 cm / 100 cm/m * 1x10^12 pm/m = 361.4 pm Doing an independent search for the Crystallographic Features of Copper, I see that the Lattice Parameter for copper at at 293 K is 3.6147 x 10^-10 m which is in very close agreement with the calculated amount above. And since metals expand and contract with heat and cold, I assume the slight difference in values is due to the density figure given being determined at a temperature lower than 293 K.</span>
4 0
2 years ago
14. Two or more substances that are together but do not combine to form a new, pure substance.
Katena32 [7]
The answer would be a mixture. A mixture is when two or more substances are combined to create heterogeneous mix, where the substances do not combine with each other in an equal or even state, but just sit together.
6 0
3 years ago
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