First, we must find the total mass of CuBr₂:
Mass = 64 + 2 x 80
Mass = 224
Percentage mass of copper = mass of copper x 100 / total mass
Percentage mass of copper = (64 / 224) x 100
Percentage mass of copper = 28.45%
It's not chemical because it would have to react to something to change so it is physical change because it is the same thing but it just smells I hope this helped
Answer : The characteristic properties of a substance always remains the same irrespective of the sample being observed is large or small.
Few examples of characteristic properties of any substances includes freezing or melting point, boiling or condensing point, density, viscosity and solubility. They are specific for specific substances and which makes them easily recognizable.
Whereas chemical properties are specific for one substance which chemically transformed into another substances.
Answer:
Check the explanation
Explanation:
Lorenz force exerted on electron by magnetic field is
F=e*v*H, where e=1.602E-19 C, H=3.64E-3 T, v is speed of electron;
? meanwhile Lorenz force is centripetal force F=m*v^2/r, where mass of electron m=9.11E-31 kg, r is radius of the path of electron;
? therefore F=F; e*v*H = m*v^2/r; eH=m*(v/r), hence
v/r = eH/m =w is angular speed of electron, hence
T=2pi/w =2pi*m/(eH) is period of rotation of electron;
e- and e+ starting at the same point are moving in the same circular path and in opposite directions, and should meet in T/2 time;
T/2 = pi*m/(eH) = pi*9.11E-31 /(1.602E-19 *3.48E-3) =5.13E-9 s;
<span>When storing parts outside, it is best to keep them under tarps or wrapped to stay in compliance.</span>
