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Ipatiy [6.2K]
2 years ago
3

Maria examines a mixture that appears to be the same throughout. However, when she looks at a sample using a magnifying lens, sh

e can see small droplets of liquid surrounded by another liquid. Which conclusion best fits her observations?
Chemistry
2 answers:
kolbaska11 [484]2 years ago
6 0

The mixture is a colloid because two different substances can be seen in a small sample when observed under a microscope.

Option D

<u>Explanation:</u>

Colloid is a heterogeneous mixture of two or more substances with relatively smaller size of solute particles and thus it appears to be a homogeneous mixture.

Particles present in a colloidal solution cannot be differentiated through naked eye observations and hence when Maria examined the sample under a microscope, two different substances were seen. Maria saw the mixture to be same throughout since the solute particles were very small in size and evenly dispersed in the solvent.

mash [69]2 years ago
6 0

Answer:

it is D

Explanation:

i just took the edgenuity test

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If Co(NH3)63+ has a λmax at 440 nm, calculate ΔE for the complex. A) 2.72 x 10-4 kJ/mol B) 4.52 x 10-2 kJ/mol C) 2.72 x 10 2 kJ/
riadik2000 [5.3K]

<u>Answer:</u> The energy of the complex is 2.72\times 10^2kJ

<u>Explanation:</u>

To calculate the energy of the complex, we use the equation given by Planck which is:

\Delta E=\frac{N_Ahc}{\lambda}

where,

\lambda = Wavelength of the complex = 440nm=4.40\times 10^{-7}m    (Conversion factor:  1m=10^9nm )

h = Planck's constant = 6.624\times 10^{-34}Js

c = speed of light = 3\times 10^8m/s

N_A = Avogadro's number = 6.022\times 10^{23}

\Delta E = energy of the complex

Putting values in above equation, we get:

\Delta E=\frac{6.022\times 10^{23}\times 6.624\times 10^{-34}\times 3\times 10^8}{4.40\times 10^{-7}}\\\\\Delta E=2.72\times 10^{5}J=2.72\times 10^2kJ

Conversion factor used:  1 kJ = 1000 J

Hence, the energy of the complex is 2.72\times 10^2kJ

5 0
2 years ago
A beach has a supply of sand grains composed of calcite, ferromagnesian silicate minerals, and non-ferromagnesian silicate miner
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A high school class is discussing whether a particular discovery in chemistry has had a positive impact on society. Which questi
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The most important question for the students to answer is what the discovery did to society. Did it change society in any way or better something?
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2 years ago
What features of this model will help Armando answer the question?
Scrat [10]

Answer:

The adjustable legs and the table of sand.

<em>Note:The question is incomplete. The complete question is given below.</em>

Using Models to Answer Questions About Systems

Armando’s class was looking at images of rivers formed by flowing water. Most of the rivers were wide and shallow, but one river was narrow and deep. Armando’s class thinks that this river is narrow and deep because:

  • the hill that the water flowed down was very steep, or
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Armando designed the model below to try to answer the question: Why is this river so narrow and deep?

Explanation:

The model designed by Armando will be helpful to answer the question because of the following features it possesses:

1. An adjustable leg- since one of the hypotheses put forward by the class to explain why the river was narrow and deep was that the hill that the water flowed down was very steep, the adjustable legs can be lowered or raised in order to make the slope shallower or steeper so that their hypothesis can be tested.

2. A table of sand- the table of sand serves as the streambed. By adjusting the size of the sand grains to be larger or smaller, the students will be able to to test their second hypothesis that the small size sand grains that the water flowed through was the reason for the river to be narrow and deep.

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2 years ago
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Answer:

Explanation:

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Therefore, the bond length formation between the two O atoms will be larger compared to that of the two N atoms.

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