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2 years ago

6

How are rare earth elements like neodymiun important to our technological world?

1 answer:

kherson [118]2 years ago

7 0

Im assuming, if you find rare earth elements, it is important to the technological world bc you can make more products more better, and even invent new and more modern things.

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Which has greater kinetic energy: a bullet that has a mass of 0.05kg travelling at 2,500m/s, or a lorry that has a mass of 4,500

Vladimir [108]

Answer:

the answer will be lorry

6 0

2 years ago

Read 2 more answers

Start with 100.00 mL of 0.10 M acetic acid, CH3COOH. The solution has a pH of 2.87 at 25 oC. a) Calculate the Ka of acetic acid

jasenka [17]

Answer: a) The $K_a$ of acetic acid at $25^0C$ is $1.82\times 10^{-5}$

b) The percent dissociation for the solution is $4.27\times 10^{-3}$

Explanation:

$CH_3COOH\rightarrow CH_3COO^-H^+$

cM 0 0

$c-c\alpha$ $c\alpha$ $c\alpha$

So dissociation constant will be:

$K_a=\frac{(c\alpha)^{2}}{c-c\alpha}$

Give c= 0.10 M and $\alpha$ = ?

Also $pH=-log[H^+]$

$2.87=-log[H^+]$

$[H^+]=1.35\times 10^{-3}M$

$[CH_3COO^-]=1.35\times 10^{-3}M$

$[CH_3COOH]=(0.10M-1.35\times 10^{-3}=0.09806M$

Putting in the values we get:

$K_a=\frac{(1.35\times 10^{-3})^2}{(0.09806)}$

$K_a=1.82\times 10^{-5}$

b) $\alpha=\sqrt\frac{K_a}{c}$

$\alpha=\sqrt\frac{1.82\times 10^{-5}}{0.10}$

$\alpha=4.27\times 10^{-5}$

$\% \alpha=4.27\times 10^{-5}\times 100=4.27\times 10^{-3}$

5 0

3 years ago

When she dropped a rock into a graduated cylinder of water, Veronica noticed it sank to the bottom. She decided to investigate w

Romashka [77]

A is correct. water is incompressible, so it will always have the same density, regardless of volume

8 0

3 years ago

Read 2 more answers

Adolfo drank some red punch and grimaced at the flavor. His little brother had made the pitcher of punch with too much sugar. Wh

drek231 [11]

I believe that the saliva interacting with sugar molecules is what allowed Adolfo’s brain to register the extra-sugary flavor of the punch

7 0

3 years ago

Can someone help me with 10 and 11 plz. I will mark them Brainliest

hjlf

Answer:

10. Because they want to, and what they do is none of your buisness.

11. Firefighter-chemicals in fire-stopping have science.

Pharmacist-dealing with drugs and science was used to make them.

Chef-science involved in making food.-

Explanation:

Bruhh these were so easy do it yourself next time, it took me less than a minutte to do.

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3 years ago