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nlexa [21]
3 years ago
11

Which scientists is creadited with deveploving the first sciencefic atomic theory

Chemistry
1 answer:
Verizon [17]3 years ago
4 0
John Dalton. Hope i helped!

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zhuklara [117]

Answer:

C

Explanation:

I think it is C

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3 years ago
Which of the following breaks and forms bonds?
svp [43]
Your answer would be "Chemical Change"
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19. Which organic molecule are steroids an example of?
Zarrin [17]
Steroids are lipids because they are hydrophobic and insoluble in water
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2 years ago
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A student made a copper bracelet by hammering a small copper bar into the desired shape. The bracelet has a mass of 30.1 grams a
Tcecarenko [31]
69. The student's skin was obviously warmer than the initial temperature of the bracelet. According to the second law of thermodynamics, heat transfers from a higher temperature to a lower temperature hence heat transfers from the student's skin to the bracelet warming up the bracelet. 

70. moles of copper=mass of copper/molar mass of copper
=30.1g/(63.55g/mol)= 0.4736 moles Cu

71. Delta H( heat released) = mCp(deltaT) = 30.1g(0.385 J/gK)(33-19)K = 162.23J

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7 0
3 years ago
Write the symbol for every chemical element that has atomic number less than 75 and atomic mass greater than 173.5 u.
bearhunter [10]
Following are the chemical elements that have atomic mass greater than 173.5 u and atomic number less than 75.

1.  Lutetium
                  Atomic Number  =  71
                  Atomic Mass      =  174.97 u

2.  Hafnium
                  Atomic Number  =  72
                  Atomic Mass      =  178.49 u

3.  Tantalum
                  Atomic Number  =  73
                  Atomic Mass      =  180.95 u

4.  Tungsten
                  Atomic Number  =  74
                  Atomic Mass      =  183.85 u
8 0
3 years ago
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