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4 years ago

What makes the star Alpha Centauri appear to be yellow-white??

1 answer:

3 0

The Alpha Centuri star looks yellow-white because it has the same spectral type of G2 as the sun. Alpha Centauri A also looks yellow-white because it is much hotter than Alpha Centauri B, which is yellow-orange.

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What patterns do you observe in the data?

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Explanation:

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Develop a detailed hypothesis for your experiment.What would your experimental approach be to test this hypothesis? Be detailed in your description of the experiment.

6.What are the independent, dependent, and controlled variables in your experiment?

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3 years ago

What is the significant figures of 12.00

dem82 [27]

There are 4 significant figures

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3 years ago

Which statement describes the transfer of heat energy that occurs when an ice cube is added to an insulated container with 100 m

nadya68 [22]

Number 3 is the most likely answer

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3 years ago

In Hooke's law, if a large force produces a small displacement, what does that say about the spring?

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3 years ago

What is the molarity of a 250ml KCl solution made by diluting 175mL of a 3.00 M solution?

Crank

Answer:

2.1 M

Explanation:

The dilution equation is $M_{s} V_{s} = M_{d} V_{d}$ .

$M_{s}$ = the molarity of the sock solution

$V_{s}$ = the volume of the sock solution

$M_{d}$ = the molarity of the diluted solution

$V_{d}$ = the volume of the diluted solution

The stock solution would be what is doing the diluting, so "175 mL of a 3.00 M solution". So $M_{s}$ = 3.00 M. Then: Converting 175 mL to liters: $175 mL * \frac{1 L}{1000mL} = 0.175 L$ (This is $V_{s}$ )

And converting 250 mL KCl to liters: $250 mL * \frac{1 L}{1000mL} = 0.250 L$ (This will be $V_{d}$ )

Then, we plug in our given into the dilution equation, resulting in:

$3.00 M * 0.175 L = M_{d} * 0.250 L$ (divide both sides by 0.250 L, in order to get $M_{d}$ by itself)

$\frac{3.00 M * 0.175 L}{0.250 L} = M_{d}$

$M_{d} = 2.1 M$

So, the molarity of 250 mL KCl made by diluting 175 mL of a 3.0 M solution would be 2.1 M (mol/L).

Hopefully this helped you understand the topic a little bit better. I just finished molarity and dilutions in Chemistry last week. Good luck!

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3 years ago