Qualitative and Quantitative analysis

Question 1

Electromagnetic Spectrum

Answer 1

Heated samples of pure elements emit a distinctive pattern of lines
Can be used to predict elements in samples found

Question 2

How do emission and absorption spectra differ

Answer 2

Emission: shows the light reflected as white lines on a black background
Absorption: shows the light absorbed as black lines on a rainbow-like rectangle

Question 3

How did Bohr predict elements emit light when heated?

Answer 3

When heated, electrons move from one orbit to another as they absorb energy
When they return to their correct orbit they release the energy in the form of light

Question 4

Flame tests and Emission Spectra

Answer 4

Heat or electricity is used to excite the electrons of an element and the energy it absorbs is released in the form of light

Question 5

Solubility Test

Answer 5

Mixing certain aqueous solutions can produce precipitates which can indicate the presence of a certain ion or compound

Question 6

Infrared Spectroscopy

Answer 6

Atoms vibrate at certain frequencies which can be used to determine what is present in a sample