Question 1
a. mention two advantages and two disadvantages of instrumental methods of analysis
b. state 2 properties of electromagnetic radiation (emr)
c. an emr makes one complete oscillation in 12 seconds. if the frequency of oscillatien is
0.0833hz calculate the following:
(i) wavelength (ii) angular velocity (iii) photon energy of the radiation
(c = 3.0 x 109 m/s, h = 6.626 x 102).s, n = 22 of 3.142)

Use the table to identify the phase and phase changes of the elements under the given conditions. write the name of the substance, phase, or phase change. when the temperature in a room increases from 25°c to 33°c, changes from a solid to a liquid. in a lab, methane and nitrogen are cooled from -170°c to -200°c. the methane freezes and the nitrogen . when gold is heated to 2,856°c it changes from a liquid to a .

There are 6.022, 104 atoms of hg in 1 mole of hg the number of atoms in 45 moles of hg can be found by multiplying 4.5 by 6.022, 102 which is the number of atoms in 4.5 moles of hg, correctly written in scientific notation with the correct number of significant figures? 0 21,109 0 21,100 271, 1024 27.099, 100 mark this and retum save and exit submit

Astudent reacts 13 moles of iron with 21 moles of oxygen according to the following equation: