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Shkiper50 [21]
4 years ago
13

The work of scientists usually begins with

Chemistry
1 answer:
VladimirAG [237]4 years ago
6 0
A. Testing a hypothesis

This leads to the other points
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Great question!  An element is one specific symbol. For example, Mg would be an element, N would be an element, and O would be an element. A compound is several elements that come together. Since Mg(NO3)2 is made of three separate elements (Mg, N, and O), Mg(NO3)2 is a compound.
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Telephone signals are often transmitted over long distances by microwaves. what is the frequency of microwave iradiation with a
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<span>c = speed of light = 3.00 x 10^5 km/s = 3.00 x 10^8 m/s
  λ = wavelength of the microwave radiation = 3.50 cm = 0.035 m
  f = frequency (in Hertz) = to be determined
    f = c/λ = 3.00 x 10^8 m/s / 0.035 m
  f = 8.57 x 10^9 Hz Frequency</span>
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Air is a mixture of elements which are formed my atoms that forms molecules. Hope that helps!
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