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Asam, Basa, dan Garam Kelas 7 Sains NCERT

Asam, Basa, dan Garam Kelas 7 Sains NCERT

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Asam, Basa, dan Garam Kelas 7 Sains NCERT
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Q. 1. Berikan perbedaan antara asam dan basa?
Q.2. Amonia ditemukan dalam banyak produk rumah tangga, seperti pembersih jendela. Ini mengubah litmus merah menjadi biru. Apa sifatnya?
Q.4. Apakah air distilat bersifat asam/basa/netral? Bagaimana Anda memverifikasinya?
Q.5 Deskripsikan proses netralisasi dengan bantuan contoh.

課程內容

5 部分 • 5 講座 • 00:35:28 總長度

A Introduction

03:25
Q. 1. State differences between acids and bases. Q.2. Ammonia is found in many household products, such as window cleaners. It turns red litmus blue. What is its nature? Q.3. Name the source from which litmus solution is obtained. What is the use of this solution? Q.4. Is the distilled water acidic/basic/neutral? How would you verify it? Q.5 Describe the process of neutralisation with the help of an example.
  1. Mark ‘T’ if the statement is true and ‘F’ if it is false:
(i) Nitric acid turn red litmus blue. (T/F) (ii) Sodium hydroxide turns blue litmus red. (T/F) (iii) Sodium hydroxide and hydrochloric acid neutralise each other and form salt and water. (T/F) (iv) Indicator is a substance which shows different colours in acidic and basic solutions. (T/F) (v) Tooth decay is caused by the presence of a base. (T/F) Q.7.Dorji has a few bottles of soft drink in his restaurant. But, unfortunately, these are not labelled. He has to serve the drinks on the demand of customers. One customer wants acidic drink, another wants basic and third one wants neutral drink. How will Dorji decide which drink is to be served to whom? Q.8. Explain why: (a) An antacid tablet is taken when you suffer from acidity. (b) Calamine solution is applied on the skin when an ant bites. (c) Factory waste is neutralised before disposing it into the water bodies. Q. 9. Three liquids are given to you. One is hydrochloric acid, another is sodium hydroxide and third is a sugar solution. How will you identify them? You have only turmeric indicator. Q. 10. Blue litmus paper is dipped in a solution. It remains blue. What is the nature of the solution? Explain. Q.11. Consider the following statements: (a) Both acids and bases change colour of all indicators. (b) If an indicator gives a colour change with an acid, it does not give a change with a base. (c) If an indicator changes colour with a base, it does not change colour with an acid. (d) Change of colour in an acid and a base depends on the type of the indicator. Which of these statements are correct? (i) All four (ii) a and d (iii) b, c and d (iv) only d

Differences between acids and bases, Nature of ammonia & distilled water, litmus

08:26

Q. 1. State differences between acids and bases.
Q.2. Ammonia is found in many household products, such as window cleaners. It turns red litmus blue. What is its nature?
Q.3. Name the source from which litmus solution is obtained.What is the use of this solution?
Q.4. Is the distilled water acidic/basic/neutral? How would you verify it?

Process of neutralisation with example and some true false questions

06:22
Q.5 Describe the process of neutralisation with the help of an example.
  1. Mark ‘T’ if the statement is true and ‘F’ if it is false:
(i) Nitric acid turn red litmus blue. (T/F) (ii) Sodium hydroxide turns blue litmus red. (T/F) (iii) Sodium hydroxide and hydrochloric acid neutralise each other and form salt and water. (T/F) (iv) Indicator is a substance which shows different colours in acidic and basic solutions. (T/F) (v) Tooth decay is caused by the presence of a base. (T/F)
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目標受眾

Class 7 Science

關於本課程

Q. 1. Berikan perbedaan antara asam dan basa.

Q.2. Amonia ditemukan dalam banyak produk rumah tangga, seperti pembersih jendela. Ini mengubah litmus merah menjadi biru. Apa sifatnya?

Q.3. Namakan sumber dari mana solusi litmus diperoleh. Apakah penggunaan solusi ini?

Q.4. Apakah air distilat bersifat asam/basa/netral? Bagaimana Anda memverifikasinya?

Q.5 Deskripsikan proses netralisasi dengan bantuan contoh.

  • Tandai 'T' jika pernyataan benar dan 'F' jika salah:
  • (i) Asam nitrat mengubah litmus merah menjadi biru. (T/F)

    (ii) Sodium hidroksida mengubah litmus biru menjadi merah. (T/F)

    (iii) Sodium hidroksida dan asam hidroklorik menetralisir satu sama lain dan membentuk garam dan air. (T/F)

    (iv) Indikator adalah zat yang menunjukkan warna berbeda dalam larutan asam dan basa. (T/F)

    (v) Karies gigi disebabkan oleh adanya basa. (T/F)

    Q.7. Dorji memiliki beberapa botol minuman ringan di restorannya. Namun, sayangnya, ini tidak dilabeli. Dia harus menyajikan minuman sesuai permintaan pelanggan. Satu pelanggan ingin minuman asam, yang lain ingin yang basa dan yang ketiga ingin minuman netral. Bagaimana Dorji akan memutuskan minuman mana yang akan disajikan kepada siapa?

    Q.8. Jelaskan mengapa:

    (a) Tablet antasida diambil ketika Anda menderita asam lambung.

    (b) Larutan kalamin dioleskan pada kulit ketika semut menggigit.

    (c) Limbah pabrik dinetralkan sebelum dibuang ke badan air.

    Q. 9. Anda diberikan tiga cairan. Satu adalah asam hidroklorat, yang lain adalah natrium hidroksida dan yang ketiga adalah larutan gula. Bagaimana Anda mengidentifikasi mereka? Anda hanya memiliki indikator kunyit.

    Q. 10. Kertas litmus biru direndam dalam larutan. Tetap biru. Apa sifat larutan tersebut? Jelaskan.

    Q.11. Pertimbangkan pernyataan berikut:

    (a) Baik asam dan basa mengubah warna semua indikator.

    (b) Jika sebuah indikator memberikan perubahan warna dengan asam, tidak memberikan perubahan dengan basa.

    (c) Jika indikator berubah warna dengan basa, tidak berubah warna dengan asam.

    (d) Perubahan warna dalam asam dan basa tergantung pada jenis indikator.

    Kualifikasinya benar?

    (i) Semua empat (ii) a dan d (iii) b, c, dan d (iv) hanya d

    Q.8. Jelaskan mengapa:

    (a) Tablet antasida diambil ketika Anda menderita asam lambung.

    (b) Larutan kalamin dioleskan pada kulit ketika semut menggigit.

    (c) Limbah pabrik dinetralkan sebelum dibuang ke

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