C8.4 Flame tests and Emission Spectroscopy

C8.4 Flame tests and Emission Spectroscopy

Keywords:

Cations

energy levels

excite

line spectrum

instruments

Open Ended

How do you think they make different colours in fireworks?

PRIOR KNOWLEDGE CHECK

Use the table to write the electron configuration for Lithium, Potassium (typo bottom no. = 19), Magnesium.

Example: Calcium = 2,8,8,2

ANSWERS

• Lithium: 3 electrons in total = 2,1 configuration

• Potassium: 19 electrons in total = 2,8,8,1 configuration

• Magnesium: 12 electrons total = 2,8,2 configuration

Open Ended

What do you know about flame tests already?

Multiple Choice

True or False

Cations are positively charged.

• True

• False

Multiple Choice

Which flame test is demonstrating the presence of potassium ions (K⁺)?

Multiple Choice

Which flame test is demonstrating the presence of sodium ions (Na⁺)?

Multiple Choice

Which flame test is demonstrating the presence of Calcium ions (Ca²⁺)?

Multiple Choice

Which flame test is demonstrating the presence of Copper (Cu²⁺)?

Multiple Select

When heated, electrons in an atom are ....................... and they then release this energy as .........................

Select the words that fill in the gaps!

• excited, heat

• heated, radiation

• excited, light

• heated, light

Fill in the 'metal ion present' column - what is the formula and charge on these ions?

Remember transition metals can have multiple charges so check the value in the name - Copper (II) = 2+ charge

Multiple Select

Select the three benefits of instrumental analysis vs chemical analysis.

• Rapid Results

• Uses all the sample

• Cheap and easy to use

• Good for very small samples

• Highly accurate

Multiple Choice

True or False

The line spectrum for one ion only contains one line.

• True

• False

Here are some other instrumental methods of analysis..

(these are not in GCSE but do come up at A level!)

Open Ended

Write one new thing you have learnt this lesson.