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Ostrovityanka [42]
3 years ago
5

List 4 factors that suggest a chemical reaction has taken place

Chemistry
1 answer:
Degger [83]3 years ago
3 0
The change in smell, The change in taste, If there is rust, i cant think of any other on the spot but if something were to catch fire then there is a chemical change.
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-, or stirring, of the solute in the solvent
Hoochie [10]
Agitation, or stirring of the solute in the solvent increases the solubility of the solution
7 0
3 years ago
Blank c2h4 + blank o2 → blank co2 + blank h2o how many moles of o2 are in the chemical equation when balanced using the lowest w
umka21 [38]

The reaction is<span>
C</span>₂H₄ + O₂ → CO₂ + H₂O<span>

To balance the equation, both side have same number of elements. Here,</span>

In left hand side has                                            in right hand side has

           4 H atoms                                                       2 H atoms 

           2 C atoms                                                       1 C atom 

<span>           2 O atoms                                                       3 O atoms 

First, we have to balance number of C atoms and number of H atoms in both side.  
To balance C atoms, '2' should be added before CO</span>₂ and to balance H atoms, '2' should be added before H₂<span>O. 
Then number of oxygen atoms is </span>2 x 2 + 2 = 6 in right hand side. So, 3 should be added before O₂<span> in left hand side.
After balancing the equation should be,</span>

C₂H₄<span> + 3O</span>₂<span> → 2CO</span>₂<span> + 2H</span>₂O


8 0
3 years ago
When an electron in a 2p orbital of a particular atom makes a transition to the 2s orbital, a photon of approximate wavelength 6
Mariulka [41]

Answer:

The energy difference between these 2p and 2s orbitals is 3.07\times 10^{-19} J

Explanation:

Wavelength of the photon emitted = \lambda =646.3 nm =646.3\times 10^{-9} m

Energy of the photon will corresponds to the energy difference between 2p and 2s orbital = E

Energy of the photon is given by Planck's equation:

E=\frac{hc}{\lambda }

h = Planck's constant = 6.626\tiomes 10^{-34} Js

c = Speed of the light = 3\times 10^8 m/s

E=\frac{6.626\tiomes 10^{-34} Js\times 3\times 10^8 m/s}{646.3\times 10^{-9} m}

E=3.07\times 10^{-19} J

The energy difference between these 2p and 2s orbitals is 3.07\times 10^{-19} J

3 0
4 years ago
each year, one person in north america uses resources equal to how much land? A. 12 miles B. 12 acres C. 120 acres
KATRIN_1 [288]
B. 12 acres

i think i don’t do geography
4 0
3 years ago
Warwick Police discovered the body of a 36-year-old white male (later identified as Darren Davis) in a field about 20 miles nort
lina2011 [118]
I think it was sue to she has all the details to seem like it was her
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3 years ago
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