Chemistry - 0620 CIE

Fertilisers

Muhtasari

Every harvest takes nutrients out of the soil, and unless they are put back the land slowly stops being able to feed crops. Fertilisers are the chemicals that replace those lost nutrients, and they are one of the main reasons farmers can grow enough food for a growing world population.

In this lesson you will learn that ammonium salts and nitrates are used as fertilisers, and what NPK fertilisers are: mixtures that supply the three key elements nitrogen, phosphorus and potassium for healthy plant growth. You will see why each element matters and how these fertilisers are made.

Malengo

State that ammonium salts and nitrates are used as fertilisers.
Describe the use of NPK fertilisers to provide the elements nitrogen, phosphorus and potassium for improved plant growth.

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Maelezo ya Somo

Feeding the world depends on fertilisers. Crops strip nitrogen, phosphorus and potassium from the soil as they grow, and fertilisers replace them so the same land can be farmed year after year. Understanding what fertilisers contain and why links chemistry directly to agriculture and food security.

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Tathmini ya Somo

Hongera kwa kukamilisha somo la Fertilisers. Sasa kwa kuwa umechunguza dhana na mawazo muhimu, ni wakati wa kuweka ujuzi wako kwa mtihani. Sehemu hii inatoa mazoezi mbalimbali maswali yaliyoundwa ili kuimarisha uelewaji wako na kukusaidia kupima ufahamu wako wa nyenzo.

Utakutana na mchanganyiko wa aina mbalimbali za maswali, ikiwemo maswali ya kuchagua jibu sahihi, maswali ya majibu mafupi, na maswali ya insha. Kila swali limebuniwa kwa umakini ili kupima vipengele tofauti vya maarifa yako na ujuzi wa kufikiri kwa makini.

Tumia sehemu hii ya tathmini kama fursa ya kuimarisha uelewa wako wa mada na kubaini maeneo yoyote ambapo unaweza kuhitaji kusoma zaidi. Usikatishwe tamaa na changamoto zozote utakazokutana nazo; badala yake, zitazame kama fursa za kukua na kuboresha.

Which of these is used as a nitrogen fertiliser? A. Sodium chloride B. Ammonium nitrate C. Calcium carbonate D. Copper sulfate Answer: B
What do the letters N, P and K stand for in an NPK fertiliser? A. Nitrogen, phosphorus, potassium B. Nitrogen, potassium, krypton C. Neon, phosphorus, potassium D. Nitrate, phosphate, potassium Answer: A
Ammonium nitrate is made by reacting ammonia with: A. Sulfuric acid B. Hydrochloric acid C. Nitric acid D. Carbonic acid Answer: C
Which element in a fertiliser mainly promotes strong root growth? A. Nitrogen B. Phosphorus C. Potassium D. Carbon Answer: B
Why are ammonium salts and nitrates good fertilisers? A. They are insoluble B. They supply nitrogen and dissolve in soil water C. They are acidic gases D. They remove nutrients Answer: B

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Vitabu Vinavyopendekezwa

Cambridge IGCSE Chemistry Coursebook

Manukuu: Fifth edition

Mchapishaji: Cambridge University Press

Mwaka: 2021

ISBN: 978-1-108-95160-9

Maelezo: Endorsed coursebook with full coverage of the 0620/0971 syllabus, worked examples and practical guidance.

Cambridge IGCSE Chemistry

Manukuu: Fourth edition

Mchapishaji: Hodder Education

Mwaka: 2021

ISBN: 978-1-398-31050-6

Maelezo: Endorsed textbook covering the Core and Supplement content with questions and practical work.

Jifunze zaidi kutoka vyanzo huria

Sehemu ya kitabu Occurrence, Preparation, and Properties of Nitrogen OpenStax · Chemistry
Describe the properties, preparation, and uses of nitrogen

"Chemistry: Occurrence, Preparation, and Properties of Nitrogen" by OpenStax, OpenStax, Rice University, licensed under CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Source: https://openstax.org/books/chemistry/pages/18-7-occurrence-preparation-and-properties-of-nitrogen. Access for free at https://openstax.org/books/chemistry/pages/1-introduction
Sehemu ya kitabu Occurrence, Preparation, and Properties of Phosphorus OpenStax · Chemistry
Describe the properties, preparation, and uses of phosphorus

"Chemistry: Occurrence, Preparation, and Properties of Phosphorus" by OpenStax, OpenStax, Rice University, licensed under CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Source: https://openstax.org/books/chemistry/pages/18-8-occurrence-preparation-and-properties-of-phosphorus. Access for free at https://openstax.org/books/chemistry/pages/1-introduction

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