Lesson: Flame Tests

In this lesson, we will learn how to identify the use of flame tests and the colors produced by alkali, alkaline earth, and other metal atoms.

Worksheet: Flame Tests • 19 Questions

Q1:

When a salt is placed in the flame of a Bunsen burner, the flame changes color. What feature of the metal ions in the salt determines the color of the flame in this experiment?

Q2:

When performing a flame test, on which alkali metal is cobalt glass used to filter out its flame color?

Q3:

Which of the following terms best describes the color of the flame produced by rubidium salts?

Q4:

Before a compound is analyzed using a flame test, it is typically dissolved in hydrochloric acid. What is the main reason for preparing the sample in this way?

Q5:

A student is performing a number of flame tests using a sampling loop made of platinum wire. After each flame test, the sampling loop is washed with hydrochloric acid. What must the student do to ensure the sampling loop is clean before it is used for another flame test?

Q6:

To determine the composition of a mixture of elements, a sample of the mixture is dissolved in hydrochloric acid for analysis using a flame test. The emission spectrum from the flame test is measured using a spectroscope. Which of the following parameters cannot be fully determined using this method?

Q7:

Additional data may be obtained by passing the light from a flame test through a spectroscope. Which of the following is not an advantage of this technique?

Q8:

Give the chemical symbols of the two alkaline earth metals that produce orange-red or red flames in a flame test.

Q9:

A student uses a flame test to determine whether the major product of a reaction is a potassium salt. Which of the following would not improve the quality of the test?

Q10:

When an alkali metal is dissolved in hydrochloric acid and analyzed using a flame test, an intense orange flame is observed. Why might more information be needed to confirm the identity of the metal in the sample?

Q11:

Which alkali metal most resembles strontium when analyzed using a flame test?

Q12:

Which alkaline earth metal most resembles copper when analyzed using a flame test?

Q13:

Which s-block metal does not produce a colored flame in a flame test?

Q14:

The table lists the colors observed for different ranges of visible light wavelengths. The wavelength of a line in a flame emission spectrum can be used to identify the metal ion present in a sample.

Color Red Orange Yellow Green Blue Violet
Wavelength Range (nm) 620–750 590–620 570–590 495–570 450–495 380–450

A metal emits light with a wavelength of 671 nm. What color does the light appear?

The flame emission spectrum of a material displays an intense line at 589 nm. Which alkali metal is likely to be present in the sample?

The flame emission spectrum of a material displays an intense line at 554 nm. Which alkaline earth metal is likely to be present in the sample?

A sample contains a high concentration of copper salts. In which region of the flame emission spectrum are the most intense lines likely to occur?

Q15:

Additional data may be obtained by passing the light from a flame test through a spectroscope. Which of the following statements is false?

Q16:

The color of a flame test arises due to the formation of excited atoms at high temperature. Which of the following diagrams best represents an excited lithium atom and the main process responsible for the colored flame?

Q17:

What is the chemical symbol of the s-block metal that burns in air with a flame color similar to that shown?

Q18:

What is the chemical symbol of the s-block metal that burns in air with a flame color similar to that shown?

Q19:

In which of the following images does the result of the flame test indicate the presence of barium?

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