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Kwasy, Zasady i Sole Klasa 7 Nauka NCERT

Kwasy, Zasady i Sole Klasa 7 Nauka NCERT

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Prabh Kirpa Classes
Prabh Kirpa Classes

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Kwasy, Zasady i Sole Klasa 7 Nauka NCERT
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Нұсқаушымен танысыңыз: Prabh Kirpa Classes

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Q. 1. Podaj różnice między kwasami i zasadami?
Q.2. Ammoniak znajduje się w wielu produktach domowych, takich jak środki do czyszczenia szyb. Zmienia czerwony litmus na niebieski. Jaka jest jego natura?
Q.4. Czy woda destylowana jest kwaśna/zasadowa/neutralna? Jak byś to zweryfikował?
Q.5 Opisz proces neutralizacji za pomocą przykładu.

Курстың мазмұны

5 бөлімдер • 5 дәрістер • 00:35:28 жалпы ұзындығы

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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Q. 1. Podaj różnice między kwasami i zasadami.

Q.2. Ammoniak znajduje się w wielu produktach domowych, takich jak środki do czyszczenia szyb. Zmienia czerwony litmus na niebieski. Jaka jest jego natura?

Q.3. Nazwę źródła, z którego uzyskuje się roztwór litmusowy. Jaka jest użyteczność tego roztworu?

Q.4. Czy woda destylowana jest kwaśna/zasadowa/neutralna? Jak byś to zweryfikował?

Q.5 Opisz proces neutralizacji za pomocą przykładu.

  • Zaznacz 'P', jeśli zdanie jest prawdziwe i 'F', jeśli jest fałszywe:

    • (i) Kwas azotowy zmienia czerwony litmus na niebieski. (P/F)

    (ii) Wodorotlenek sodu zmienia niebieski litmus na czerwony. (P/F)

    (iii) Wodorotlenek sodu i kwas solny neutralizują się nawzajem i tworzą sól i wodę. (P/F)

    (iv) Wskaźnik jest substancją, która wykazuje różne kolory w roztworach kwaśnych i zasadowych. (P/F)

    (v) Rozkład zębów jest spowodowany obecnością zasady. (P/F)

    Q.7. Dorji ma kilka butelek napojów bezalkoholowych w swojej restauracji. Niestety, nie są one oznakowane. Musi obsłużyć napoje na żądanie klientów. Jeden klient chce kwaśny napój, inny zasadowy, a trzeci neutralny. Jak Dorji zdecyduje, który napój ma zostać podany komu?

    Q.8. Wyjaśnij dlaczego:

    (a) Tabletka przeciwkwaśna jest przyjmowana, gdy cierpisz na kwasicę.

    (b) Roztwór kalaminowy nakłada się na skórę, gdy osłabił cię mrówka.

    (c) Odpady fabryczne są neutralizowane przed wyrzuceniem do wód.

    Q. 9. Otrzymujesz trzy płyny. Jeden to kwas solny, drugi to wodorotlenek sodu, a trzeci to roztwór cukru. Jak je zidentyfikujesz? Masz tylko wskaźnik kurkuminowy.

    Q. 10. Niebieski papier litmusowy jest zanurzony w roztworze. Pozostaje niebieski. Jaka jest natura roztworu? Wyjaśnij.

    Q.11. Rozważ następujące stwierdzenia:

    (a) Zarówno kwasy, jak i zasady zmieniają kolor wszystkich wskaźników.

    (b) Jeśli wskaźnik daje zmianę koloru z kwasem, nie daje zmiany z zasadą.

    (c) Jeśli wskaźnik zmienia kolor z zasadą, nie zmienia koloru z kwasem.

    (d) Zmiana koloru w kwasie i zasadzie zależy od rodzaju wskaźnika.

    Które z tych stwierdzeń są prawdziwe?

    (i) Wszystkie cztery (ii) a i d (iii) b, c i d (iv) tylko d

    Q.8. Wyjaśnij dlaczego:

    (a) Tabletka przeciwkwaśna

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    This channel is purely education based. Our aim is to ensure that the students are able to understand each and every question in an easy way. We take pride in providing quality educational services to the students of Class VII to Class XI Science NCERT, English, Computer solutions, Mathematics, Business Studies & Economics. Our goal is to help the leaders of tomorrow to learn to succeed today....

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