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Svetlanka [38]
2 years ago
12

Matter that has a uniform and defined composition is called a​

Chemistry
1 answer:
Fittoniya [83]2 years ago
6 0
Answer - A substance is matter that has a uniform and definite composition. All samples of substances, sometimes called pure substances, have identical properties.
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Which atomic model states that it is impossible to know the exact location of electrons around the nucleus?
Alja [10]
<span>The correct answer is electron-cloud model. This model states that electrons don't go around in an eliptical way but rather completely erratically and uncontrolably and this is why it can't be known where they are or how they will behave. They form sort of like a cloud of many electrons that move erratically so you have to check it to see where it is.</span>
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3 years ago
What do nucleic acids and phospholipids have in common?
erastova [34]

They are both important cell signaling molecules and both of them contain phosphate groups.

7 0
2 years ago
What is the threshold frequency ν0 of cesium?
Montano1993 [528]
 I think this is what you're after:

 Cs(g) → Cs^+ + e⁻ ΔHIP = 375.7 kJ mol^-1 [1] 


Convert to J and divide by the Avogadro Const to give E in J per photon 


E = 375700/6.022×10^23 = 6.239×10^-19 J 


Plank relationship E = h×ν E in J ν = frequency (Hz s-1) 


Planck constant h = 6.626×10^-34 J s 


6.239×10^-19 = (6.626×10^-34)ν 


ν = 9.42×10^14 s^-1 (Hz) 


IP are usually given in ev Cs 3.894 eV 


<span>E = 3.894×1.60×10^-19 = 6.230×10^-19 J per photon </span>

4 0
2 years ago
When metals react with acid, bubbles of what gas are produced?​
elena-14-01-66 [18.8K]

Answer:

hydrogen is the answer

5 0
3 years ago
Read 2 more answers
Chemicals that are able to slow or stop the reaction rate are inhibitors. reactants. products. catalysts.
erma4kov [3.2K]

Answer:inhibitors

Explanation:

I just took the quiz .

7 0
2 years ago
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