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horrorfan [7]
3 years ago
9

Metals are______ because light reflects off the electrons.

Chemistry
2 answers:
Colt1911 [192]3 years ago
8 0

Answer: A - Shiny

Explanation: Those elements can be classified as the metals which have free electrons and have a tendency to lose them . Thus s block elements have high metallic character in them due to the presence of an unpaired electron which can be easily lost to give a stable configuration.

Metals are shiny due to these unpaired or free electrons. When light falls on the metal , these free electrons vibrate producing there own light which reflects back to give them shiny and lustorous appearance.

elena55 [62]3 years ago
6 0
Metals are -shiny- because light reflects off the electrons.
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A thin-walled sphere rolls along the floor. What is the ratio of its translational kinetic energy to its rotational kinetic ener
ICE Princess25 [194]

Explanation:

The kinetic energy of translation

E_1=\frac{1}{2}mv^2

m= mass v= linear velocity

The kinetic energy of rotation

E_2=\frac{1}{2}I\omega^2

I= MOI of the thin walled sphere =kmR^2

where ω= v/R= angular velocity

E_2=\frac{1}{2}kmR^2\frac{v}{R}^2

Then

\frac{E_1}{E_2} = \frac{0.5mv^2}{0.5kmR^2\frac{v}{R}^2 }

=1/k

solid sphere: k=0.4;   E1/E2 =1/0.4 = 2.5;  

 hollow sphere: k=2/3;   E1/E2 = 1.5

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3 years ago
Copper has two isotopes. Copper-63, which has an atomic mass of of 62.93 u and copper-65, which has an atomic mass of 64.93 u. I
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Answer:

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3 years ago
How many moles of NH4NO3(s) must be dissolved in water so that 73.0 kJ of heat is absorbed from the water? (The molar heat of so
SCORPION-xisa [38]
1 mole of NH4NO3 requires absorption of 25.7 kJ/mol.
Therefore; 1 kJ of heat energy is absorbed by dissolving 1/25.7 moles of NH4NO3. 
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7 0
3 years ago
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Throughout your essay, you’ve shared experiences, skills and knowledge that have driven you toward who you are today. In your conclusion, remind the admissions team about how all those different elements work in combination to make you a unique candidate for their program.
2) It recaps where you are.
This is an aspect applicants often forget to include. You are at a crucial junction between the past and the future, and this program you’re applying to is the bridge. Recap why this program is an important stepping stone in your career path and how it’s a good fit for you personally.
3) It recaps where you are going.
Most importantly, you must tell the admissions team what your long-term career goal is. The more specific you can be, the better (even if you aren’t 100% sure, it’s best to come off as confident that you know what you want!). For example, rather than just recapping that you want to become a doctor, you can share additional sub-goals, such as wanting to be a doctor who works in low-income, inner city hospitals since you volunteered at those types of facilities before. Or perhaps you plan to go back to the country where you grew up and work as a surgeon there since they are in such short supply.
Bring It Together
Once we bring all three of those elements together, you can see how they link together to form one, solid conclusion. Ideally, your conclusion should be about 4-6 sentences long — not too short but not a long ramble. Below is an example showing how fusing the past (1), present (2) and future (3) together can end your essay on a strong note.
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Pliss help
Vladimir [108]

Answer: I believe it is artificial selection (not certain though)

Explanation: modern day dogs have been bread an domesticated to be used by humans in ways we see fit.

5 0
3 years ago
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