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Zuren, Basen en Zouten Klasse 7 Wetenschap NCERT

Zuren, Basen en Zouten Klasse 7 Wetenschap NCERT

Barcha darajalar • 5 Ma'ruzalar • Umrbod kirish
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Zuren, Basen en Zouten Klasse 7 Wetenschap NCERT
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V. 1. Noem de verschillen tussen zuren en basen.
V.2. Ammoniak wordt gevonden in veel huishoudelijke producten, zoals raamreinigers. Het maakt rood litmuspapier blauw. Wat is zijn aard?
V.4. Is gedestilleerd water zuur/basisch/neutraal? Hoe zou je het verifiëren?
V.5 Beschrijf het proces van neutralisatie met behulp van een voorbeeld.

Kurs mazmuni

5 bo'limlar • 5 ma'ruzalar • 00:35:28 umumiy uzunligi

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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Talablar

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Maqsadli auditoriya

Class 7 Science

Ushbu kurs haqida

V. 1. Noem de verschillen tussen zuren en basen.

V.2. Ammoniak wordt gevonden in veel huishoudelijke producten, zoals raamreinigers. Het maakt rood litmuspapier blauw. Wat is zijn aard?

V.3. Noem de bron waaruit litmusoplossing wordt verkregen. Wat is het gebruik van deze oplossing?

V.4. Is gedestilleerd water zuur/basisch/neutraal? Hoe zou je het verifiëren?

V.5 Beschrijf het proces van neutralisatie met behulp van een voorbeeld.

  • Markeer 'W' als de verklaring waar is en 'O' als deze onwaar is:

    • (i) Salpeterzuur maakt rood litmuspapier blauw. (W/O)

    (ii) Natriumhydroxide maakt blauw litmuspapier rood. (W/O)

    (iii) Natriumhydroxide en zoutzuur neutraliseren elkaar en vormen zout en water. (W/O)

    (iv) Indicator is een stof die verschillende kleuren vertoont in zure en basische oplossingen. (W/O)

    (v) Tandverval wordt veroorzaakt door de aanwezigheid van een base. (W/O)

    V.7. Dorji heeft een paar flessen frisdrank in zijn restaurant. Maar helaas, deze zijn niet gelabeld. Hij moet de drankjes op verzoek van klanten serveren. De ene klant wil een zure drank, een andere wil een basische en de derde wil een neutrale drank. Hoe zal Dorji beslissen welke drank moet worden geserveerd aan wie?

    V.8. Leg uit waarom:

    (a) Een antacida-tablet wordt ingenomen wanneer je last hebt van zuurbrand.

    (b) Calamine-oplossing wordt aangebracht op de huid wanneer een mier bijt.

    (c) Fabrieksafval wordt geneutraliseerd voordat het in waterlichamen wordt geloosd.

    V. 9. Je krijgt drie vloeistoffen. Een is zoutzuur, een andere is natriumhydroxide en de derde is een suikeroplossing. Hoe zul je ze identificeren? Je hebt alleen een kurkuma-indicator.

    V. 10. Blauw litmuspapier wordt in een oplossing gedompeld. Het blijft blauw. Wat is de aard van de oplossing? Leg uit.

    V.11. Overweeg de volgende verklaringen:

    (a) Zowel zuren als basen veranderen de kleur van alle indicatoren.

    (b) Als een indicator een kleurverandering geeft met een zuur, geeft het geen verandering met een base.

    (c) Als een indicator van kleur verandert met een base, verandert het niet van kleur met een zuur.

    (d) Verandering van kleur in een zuur en een base hangt af van het type indicator.

    Welke van deze verklaringen zijn correct?

    (i) Alle vier (ii) a en d (iii) b, c en d (iv) alleen d

    V.8. Leg uit waarom:

    (a) Een antacida-tablet

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