Answer:
Heterogeneous mixture
Explanation:
A heterogeneous mixture is a mixture of two or more chemical substances (elements or compounds), where the different components can be visually distinguished and easily separated by physical means. Examples include: mixtures of sand and water. mixtures of sand and iron filings.
Answer:
70.92u
Explanation:
The atomic mass expresed at fisrt (69.7u) is a combination of the atomic masses of both isotopes multiplied by their natural abundance. So we can describe "(68.9*.604)+(x*.396)=69.7" the as the equation neccesary to solve this problem, where x is the atomic mass of gallium-71. x=70.92.
Explanation:
It is known that relation between heat energy and temperature change is as follows.
Q =
where, q = heat energy
m = mass of the solution or solvent
= change in temperature
Hence, putting the given values into the above formula as follows.
Q =
=
= 34650 J
Now, calculate the energy of photons at wavelength 3.02 mm as follows.
E =
where, h = planks constant =
c = velocity of light = m/s
= wavelength = 3.02 mm = m (as 1 m = 1000 mm)
Therefore, putting the given values into the above formula as follows.
E =
=
= J
Now, the number of photons required of energy J/photon for the total energy of 34650 J as follows.
n =
=
= photons
or, = photons
Thus, we can conclude that the minimum number of photons present are .