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Ácidos, Bases e Sais Classe 7 Ciência NCERT

Ácidos, Bases e Sais Classe 7 Ciência NCERT

Ngazi Zote • 5 Mihadhara • Ufikiaji wa Maisha Yote
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Mwalimu Mkuu Aliyethibitishwa

Ácidos, Bases e Sais Classe 7 Ciência NCERT
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35 dak
Jumla ya Maudhui

Utajifunza nini

Q. 1. Afirme as diferenças entre ácidos e bases.
Q.2. A amônia é encontrada em muitos produtos domésticos, como limpadores de janelas. Ela transforma o litmus vermelho em azul. Qual é a sua natureza?
Q.4. A água destilada é ácida/básica/neutra? Como você verificaria isso?
Q.5 Descreva o processo de neutralização com a ajuda de um exemplo.

Maudhui ya Kozi

5 sehemu • 5 mihadhara • 00:35:28 urefu wa jumla

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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Watazamaji Walengwa

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Kuhusu kozi hii

Q. 1. Afirme as diferenças entre ácidos e bases.

Q.2. A amônia é encontrada em muitos produtos domésticos, como limpadores de janelas. Ela transforma o litmus vermelho em azul. Qual é a sua natureza?

Q.3. Nomeie a fonte da qual a solução de litmus é obtida. Qual é o uso desta solução?

Q.4. A água destilada é ácida/básica/neutra? Como você verificaria isso?

Q.5 Descreva o processo de neutralização com a ajuda de um exemplo.

  • Marque 'V' se a afirmação for verdadeira e 'F' se for falsa:
  • (i) O ácido nítrico transforma o litmus vermelho em azul. (V/F)

    (ii) O hidróxido de sódio transforma o litmus azul em vermelho. (V/F)

    (iii) O hidróxido de sódio e o ácido clorídrico se neutralizam e formam sal e água. (V/F)

    (iv) O indicador é uma substância que mostra cores diferentes em soluções ácidas e básicas. (V/F)

    (v) A cárie dentária é causada pela presença de uma base. (V/F)

    Q.7. Dorji tem algumas garrafas de refrigerantes em seu restaurante. Mas, infelizmente, estas não estão rotuladas. Ele tem que servir as bebidas conforme a demanda dos clientes. Um cliente quer uma bebida ácida, outro quer uma básica e o terceiro quer uma bebida neutra. Como Dorji decidirá qual bebida deve ser servida a quem?

    Q.8. Explique por que:

    (a) Um comprimido antiácido é tomado quando você sofre de acidez.

    (b) A solução de calamina é aplicada na pele quando uma formiga pica.

    (c) O resíduo de fábrica é neutralizado antes de ser descartado nos corpos d'água.

    Q. 9. Três líquidos são dados a você. Um é ácido clorídrico, outro é hidróxido de sódio e o terceiro é uma solução de açúcar. Como você os identificaria? Você tem apenas um indicador de cúrcuma.

    Q. 10. O papel de litmus azul é mergulhado em uma solução. Ele permanece azul. Qual é a natureza da solução? Explique.

    Q.11. Considere as seguintes afirmações:

    (a) Tanto os ácidos quanto as bases mudam a cor de todos os indicadores.

    (b) Se um indicador muda de cor com um ácido, não muda com uma base.

    (c) Se um indicador muda de cor com uma base, não muda de cor com um ácido.

    (d) A mudança de cor em um ácido e uma base depende do tipo de indicador.

    Quais dessas afirmações estão corretas?

    (i) Todas as quatro (ii) a e d (iii) b, c e d (iv) apenas d

    Q.8. Explique por que:

    (a) Um comprimido antiácido

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