Class 7 > Science Class 7 > Worksheet: Acids, Base & Salts
Worksheet: Acids, Base & Salts - Science Class 7
Q.1. True/False
(i) Nitric acid turns red litmus blue.
(ii) Sodium hydroxide turns blue litmus red.
(iii) Sodium hydroxide and hydrochloric acid neutralise each other and form salt and water.
(iv) Indicator is a substance which shows different colours in acidic and basic solutions.
(v) Tooth decay is caused by the presence of a base.
(vi) If an indicator changes colour with a base, it does not change colour with an acid.
Q.2. Fill in the blanks.
(i) Change of colour in an acid and a base depends on the type of the ____.
(ii) Acid turns ____ litmus red.
(iii) Bases turn ___ litmus blue.
(iv) Litmus has a ____ colour in distilled water.
(v) In neutralisation reaction a new substance is formed. This is called ____.
(vi) Lemon juice is ____ in nature.
Q.3. Why curd, lemon juice, orange juice and vinegar taste sour?
Q.4. Tom rubs a solution between fingers and feels soapy, what is the nature of that solution?
Q.5. What do you mean by neutral solution? Give examples.
Q.6. How does rain become acidic?
Q.7. State few properties of acids.
Q.8. Which acid is present in an ant sting?
Q.9. What is the nature of distilled water?
Q.10. Where does the word acid come from?
Q.11. Which is the most commonly used natural indicator?
Q.12. Name the acid which is present in each cell of our body.
Q.13. Blue litmus paper is dipped in a solution. It remains blue. What is the nature of the solution? Explain.
Q.14. Is the distilled water acidic/basic/neutral? How would you verify it?
Q.15. Why factory waste is neutralised before disposing it into the water bodies?
Q.16. What is acid rain?
Q.17. What is the role of hydrochloric acid in the stomach?
Q.18. Hydrochloric acid (HCl) helps us to digest food.
Q.19. What is the effect of the China rose indicator on acidic and basic solutions?
Q.20. Why a turmeric stain on my white shirt is turned to red when it is washed with soap.
The document Worksheet: Acids, Base & Salts | Science Class 7 is a part of the Class 7 Course Science Class 7.
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FAQs on Worksheet: Acids, Base & Salts - Science Class 7
| 1. What are acids, bases and salts? |  |
Ans. Acids, bases, and salts are three different types of chemical compounds. Acids are substances that release hydrogen ions when dissolved in water, while bases are substances that release hydroxide ions when dissolved in water. Salts are compounds formed when an acid reacts with a base, resulting in the neutralization of their properties.
| 2. Can you give examples of acids, bases and salts? | |
Ans. Examples of acids include vinegar (acetic acid), lemon juice (citric acid), and battery acid (sulfuric acid). Examples of bases include baking soda (sodium bicarbonate), soap (sodium hydroxide), and milk of magnesia (magnesium hydroxide). Examples of salts include table salt (sodium chloride), Epsom salt (magnesium sulfate), and baking powder (a combination of sodium bicarbonate and cream of tartar).
| 3. How do acids and bases react with each other to form salts? | |
Ans. When an acid reacts with a base, a neutralization reaction occurs. The hydrogen ions from the acid combine with the hydroxide ions from the base to form water, while the remaining ions from the acid and base combine to form a salt. For example, when hydrochloric acid (HCl) reacts with sodium hydroxide (NaOH), water (H2O) and sodium chloride (NaCl) are formed.
| 4. What are the common uses of acids, bases, and salts? | |
Ans. Acids have various uses such as in cleaning agents, food preservation, and industrial processes. Bases are commonly used in household cleaning products, personal care products, and as ingredients in cooking. Salts have numerous applications, including as flavor enhancers in food, fertilizers in agriculture, and in the production of glass, paper, and detergents.
| 5. How do acids, bases, and salts affect our daily lives? | |
Ans. Acids, bases, and salts play significant roles in our daily lives. They are essential for digestion in our stomachs (hydrochloric acid), cleaning our homes (bases), and preserving food (acetic acid). Salts are used to season our food, soften water, and maintain the pH balance in our bodies. Without acids, bases, and salts, many everyday processes and products would not be possible.
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