Nitrogenproblem

• Scheikunde
• Middelbare school
• vwo
• Leerjaar 3

Chemistry lesson about the nitrogenproblem

Nitrogen-cycle

lesson 1

I understand the meaning of the nitrogenproblem in the Netherlands

😒🙁😐🙂😃

The molecular formula of "nitrogen" in the news articles is:

Learning Goals

1. You are able to gather information form an informative text.

2. You are able to translate the information to a reaction scheme.

3. You are able to convert a reaction scheme into a correct chemical equation (microlevel).

4. You are able to sketch a "infographic" which shows the chemical equation (macronlevel).

5. You are able to explain the components of the "nitrogenproblem".

Scientist speak

In the following clip Jan Willem Erisman explains why there is a nitrogenproblem in the Netherlands.

Jan Willem Erisman is professor on the subject of Environment and Sustainability  at the University Leiden at the Center for Environmental sciences.

We will watch the start and revisit the rest at the end of lesson 2.

What is meant by "nitrogen" when discussing the "nitrogenproblem"?

• The air surrounding you contains 80%  N₂ molecules.
• This is "non-reactive" nitrogen. This is not a problematic substance
• Which substances are discussed when talkon about the "nitrogenproblem"? 

The nitrogenproblem

• The following substances are part of the problem:
    --> NO_x
    --> NH₃
    --> fertilizer
• Today you will research the problem of one of these substances
• Next class you will be the expert on you subject and share you insights with experts on the other subjects 

Expert groups

Fase 1: everyone is devided into 3 categories. Within each categorie you make groups of 3 students

E1. stikstofoxides - NOx

E2. ammonia from the air

E3. Ammonia from fertilizer

Expertgroepen ..... (klas)

1. stikstofoxides
   NO_x

1.1 ......

1.2 ......

1.3 ......

2. ammonia
    NH₃

2.1 .....

2.2 ......

2.3 .......

3. fertilizer
    NH4NO3

3.1  ......

3.2 ......

3.2 ..........

• in de titel kun je de klascode invullen
• in de blokken kun je vooraf de namen van de leerlingen invullen (indeling in groepen kan ook in de klas)

Task for the expertgroups - fase 1 

Studie the given texsts. Each texts describes several prosesses.

a. Write doen the reaction scheme for each process.

b. Convert each scheme into a balanced chemical equation.

c. Design a infographic which describes the given proces.

• Deel per expertgroep meerdere kopieën van één tekst uit;
• elke expert moet de uitwerking van de opdracht in zijn/haar schrift of op een uitgedeeld 1/2 A4 blaadje hebben staan --> deze uitwerking neemt elke leerling straks mee naar zijn/haar projectgroep.

Infographic

Example

 infographic about:

cow – manure – ammonia

Task for the expertgroups - fase 1 

Studie the given texsts. Each texts describes several prosesses.

a. Write doen the reaction scheme for each process.

b. Convert each scheme into a balanced chemical equation.

c. Design a infographic which describes the given proces.

Hoe "bestudeer"
je een tekst?

N.a.v. de ingevoerde antwoorden kun je als docent tips geven:

• lees eerst de vraag en daarna de tekst --> je weet wat je uit een tekst moet onthouden
• onderstreep / markeer belangrijke woorden / zinnen in een tekst

Discussion

• Next class you will share you information with others
• Check your answers carefully
• Bring your notes next class!

reaction schemes

groep 1

NOx

groep 2

NH3

groep 3

kunstmest

Chemical equations

groep 1

NOx

groep 2

NH3

groep 3

kunstmest

Expertgroup 1 - E1

Expertgroup 2 - E2

Expertgroup 3 - E3

Next class

Fase 2: 

• New groups of 3 studens. 1 expert from each subject
• Bring your notes

Nitrogen cycle

Lesson 2

Next class

Fase 2: 

• New groups of 3 studens. 1 expert from each subject
• Bring your notes

Projectgroepen - fase 2 - 15 min

• de voorbeeldkringloop

Toelichting bij uitgedeelde kringloop:

• groene pijlen en groene vakken geven de natuurlijke processen weer;
• oranje blokken en oranje pijlen geven de processen weer waarmee de mens extra N2 uit de lucht vastlegt in stikstofverbindingen.

Opdracht: maak met je projectgroep de kringloop meer compleet met de informatie van de aanwezige 3 verschillende experts. 

• Noteer de reactievergelijkingen in de juiste blokken;
• Teken de infographic naast het blok.

Task for mixed expert groups - fase 2

Make a translated nitrogencycle:

add all information (chemical equations + infographics)
from you expert groups. 

Projectgroepen - fase 2 - 15 min

• de voorbeeldkringloop

Result

Toelichting bij uitgedeelde kringloop:

• groene pijlen en groene vakken geven de natuurlijke processen weer;
• oranje blokken en oranje pijlen geven de processen weer waarmee de mens extra N2 uit de lucht vastlegt in stikstofverbindingen.

Opdracht: maak met je projectgroep de kringloop meer compleet met de informatie van de aanwezige 3 verschillende experts. 

• Noteer de reactievergelijkingen in de juiste blokken;
• Teken de infographic naast het blok.

Science says

On the next slide we continue the video from lesseon one. Why does the Netherlands have a problem with nitrogen

Opdracht: After the video we close the class with a set of  questions. Listen well and make notes if you want to. 

Final test

• Learning goal: Do you know more about the Nitrogen problem?
  
  Use the laptop

1. N2 (g) is called:

1. Non-reactive nitrogen
2. reactive nitrogen

2. Reactive nitrogen species are...:

1. N2, NOx and NH3
2. N2 and NOx
3. N2 and NH3
4. NOx and NH3

3. During the combustion of fossile fules nitrogen oxides are formed because:

1. Oxygen from the air reacts with nitrogen from the fossile fules
2. Oxygen and nitrogen from the air react together under high temperatures

4. A lot of ammonia comes from

1. Cowmanure
2. Animal manure
3. Fertelizer

5. The diversity in plantspecies in nature is large if:

1. There is a lot of nitrogen in the ground
2. There is a lot of nitrogen in the aire
3. There is little nitrogen in the ground
4. There is little nitrogen in the air

6. An excessive amount of the same plant growth results in:

1. a large diversity in insect species
2. Extinction of serveral insect species

7. Find the right statement:

1. Reactive nitrogen has an influence on finedust (smog)
2. Reactive nitrogen is no greenhouse gas
3. Reactive nitrogen adds to a healthy ozone layer
4. Reactive nitrogen does not dissolve in water

8. The emmision of reactive nitrogen:

1. Is not allowed to increase over the comming years
2. Needs to be halved
3. Has to be prevented
4. is allowed to increase a little over the comming years

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