Identifying positive ions

This chemistry only lesson will look at the required practical of using chemical tests to identify different metal ions in solution using flame tests and sodium hydroxide.

This quiz includes images that don't have any alt text - please contact your teacher who should be able to help you with an audio description.

Quiz:

Intro quiz - Recap from previous lesson

Before we start this lesson, let’s see what you can remember from this topic. Here’s a quick quiz!

Q1.What must the line on the chromatography paper be drawn with?

Pen Pencil Charcoal Chalk

1/10

Q2.What is the correct procedure to test for chlorine?

Place a lit splint near the gas Place a glowing splint near the gas Bubble the gas through limewater Place damp litmus paper near the gas

2/10

Q3.What is the correct procedure to test for hydrogen?

Place a lit splint near the gas Place a glowing splint near the gas Bubble the gas through limewater Place damp litmus paper near the gas

3/10

Q4.What is the correct observation for a positive test for carbon dioxide?

Bleaches litmus paper Squeaky pop sound Limewater goes cloudy Reignites the splint with fire

4/10

Q5.What is the correct observation for a positive test for hydrogen?

Bleaches litmus paper Squeaky pop sound Limewater goes cloudy Reignites the splint with fire

5/10

Q6.What is the correct observation for a positive test for oxygen?

Bleaches litmus paper Squeaky pop sound Limewater goes cloudy Reignites the splint with fire

6/10

Q7.What is the correct observation for a positive test for chlorine gas?

Bleaches litmus paper Squeaky pop sound Limewater goes cloudy Reignites the splint with fire

7/10

Q8.How do we calculate Rf?

Distance moved by solution / Distance moved by solvent Distance moved by solvent / Distance moved by solution Distance moved by the substance / Distance moved by the solvent

8/10

Q9.What is the stationary phase?

The paper The water

9/10

Q10.Why is Rf useful?

Numbers are always useful It gives us more precision because it is two decimal places It allows us to compare substances that are not on the same chromatogram

10/10

This quiz includes images that don't have any alt text - please contact your teacher who should be able to help you with an audio description.

Quiz:

Intro quiz - Recap from previous lesson

Before we start this lesson, let’s see what you can remember from this topic. Here’s a quick quiz!

Q1.What must the line on the chromatography paper be drawn with?

Pen Pencil Charcoal Chalk

1/10

Q2.What is the correct procedure to test for chlorine?

Place a lit splint near the gas Place a glowing splint near the gas Bubble the gas through limewater Place damp litmus paper near the gas

2/10

Q3.What is the correct procedure to test for hydrogen?

Place a lit splint near the gas Place a glowing splint near the gas Bubble the gas through limewater Place damp litmus paper near the gas

3/10

Q4.What is the correct observation for a positive test for carbon dioxide?

Bleaches litmus paper Squeaky pop sound Limewater goes cloudy Reignites the splint with fire

4/10

Q5.What is the correct observation for a positive test for hydrogen?

Bleaches litmus paper Squeaky pop sound Limewater goes cloudy Reignites the splint with fire

5/10

Q6.What is the correct observation for a positive test for oxygen?

Bleaches litmus paper Squeaky pop sound Limewater goes cloudy Reignites the splint with fire

6/10

Q7.What is the correct observation for a positive test for chlorine gas?

Bleaches litmus paper Squeaky pop sound Limewater goes cloudy Reignites the splint with fire

7/10

Q8.How do we calculate Rf?

Distance moved by solution / Distance moved by solvent Distance moved by solvent / Distance moved by solution Distance moved by the substance / Distance moved by the solvent

8/10

Q9.What is the stationary phase?

The paper The water

9/10

Q10.Why is Rf useful?

Numbers are always useful It gives us more precision because it is two decimal places It allows us to compare substances that are not on the same chromatogram

10/10

Video

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Worksheet

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This quiz includes images that don't have any alt text - please contact your teacher who should be able to help you with an audio description.

Quiz:

Testing positive ions

This quiz will test your knowledge from this lesson and previous lessons

Q1.What colour will sodium ions glow in a flame test?

Crimson Orange-red Yellow Green Lilac

1/10

Q2.What colour will copper ions glow in a flame test?

Crimson Orange-red Yellow Green Lilac

2/10

Q3.What colour will calcium ions glow in a flame test?

Crimson Orange-red Yellow Green Lilac

3/10

Q4.What colour will lithium ions glow in a flame test?

Crimson Orange-red Yellow Green Lilac

4/10

Q5.What colour will potassium ions glow in a flame test?

Crimson Orange-red Yellow Green Lilac

5/10

Q6.What colour precipitate will a solution of magnesium ions turn when sodium hydroxide is added?

Blue Green Brown White

6/10

Q7.What colour precipitate will a solution of copper (II) ions turn when sodium hydroxide is added?

Blue Green Brown White

7/10

Q8.What colour precipitate will a solution of iron (II) ions turn when sodium hydroxide is added?

Blue Green Brown White

8/10

Q9.What colour precipitate will a solution of iron (III) ions turn when sodium hydroxide is added?

Blue Green Brown White

9/10

Q10.Which white precipitate dissolves in excess sodium hydroxide?

Calcium hydroxide Magnesium hydroxide Aluminium hydroxide

10/10

This quiz includes images that don't have any alt text - please contact your teacher who should be able to help you with an audio description.

Quiz:

Testing positive ions

This quiz will test your knowledge from this lesson and previous lessons

Q1.What colour will sodium ions glow in a flame test?

Crimson Orange-red Yellow Green Lilac

1/10

Q2.What colour will copper ions glow in a flame test?

Crimson Orange-red Yellow Green Lilac

2/10

Q3.What colour will calcium ions glow in a flame test?

Crimson Orange-red Yellow Green Lilac

3/10

Q4.What colour will lithium ions glow in a flame test?

Crimson Orange-red Yellow Green Lilac

4/10

Q5.What colour will potassium ions glow in a flame test?

Crimson Orange-red Yellow Green Lilac

5/10

Q6.What colour precipitate will a solution of magnesium ions turn when sodium hydroxide is added?

Blue Green Brown White

6/10

Q7.What colour precipitate will a solution of copper (II) ions turn when sodium hydroxide is added?

Blue Green Brown White

7/10

Q8.What colour precipitate will a solution of iron (II) ions turn when sodium hydroxide is added?

Blue Green Brown White

8/10

Q9.What colour precipitate will a solution of iron (III) ions turn when sodium hydroxide is added?

Blue Green Brown White

9/10

Q10.Which white precipitate dissolves in excess sodium hydroxide?

Calcium hydroxide Magnesium hydroxide Aluminium hydroxide

10/10

Lesson summary: Identifying positive ions

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Identifying positive ions

Intro quiz - Recap from previous lesson

Intro quiz - Recap from previous lesson

Video

Worksheet

Testing positive ions

Testing positive ions

Lesson summary: Identifying positive ions

It looks like you have not completed one of the quizzes.

Time to move!

The next lesson in: Chemical analysis is: Testing for negative ions

Browse Oak's lessons:

The next lesson in:
Chemical analysis
is:
Testing for negative ions