Class 8 Exam > Class 8 Notes > Science Curiosity Class 8 - New NCERT > Worksheet: Nature of Matter: Elements, Compounds, and Mixtures
Worksheet: Nature of Matter: Elements, Compounds, and Mixtures | Science Curiosity Class 8 - New NCERT PDF Download
| Table of contents |
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| Multiple Choice Questions |
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| Fill in the Blanks |
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| Very Short Answer Questions |
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| Short Answer Type Questions |
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Multiple Choice Questions
Q1. Which of the following is a uniform mixture?
(a) Sprout salad
(b) Sand and water
(c) Stainless steel
(d) Poha
Q2. What happens when lime water is exposed to air?
(a) It turns green
(b) It becomes milky
(c) It evaporates
(d) It remains unchanged
Q3. Which substance is an element?
(a) Water
(b) Sodium chloride
(c) Sulfur
(d) Iron sulfide
Q4. Why can’t water be separated into hydrogen and oxygen by physical methods?
(a) It is a uniform mixture
(b) It is a compound
(c) It is an element
(d) It is a non-uniform mixture
Q5. Which mixture can be separated using a magnet?
(a) Sugar and water
(b) Iron filings and sulfur
(c) Air
(d) Seawater
Fill in the Blanks
Q1. A _________ consists of two or more substances that retain their individual properties.
Q2. Air is a _________ mixture of gases like nitrogen and oxygen.
Q3. A pure substance made of one type of atom is called an _________.
Q4. Water is a _________ made of hydrogen and oxygen in a fixed ratio.
Q5. _________ in air reacts with lime water to form calcium carbonate.
Q6. Bronze is an _________ of copper and tin.
Q7. _________ particles in air are considered pollutants, not part of its natural composition.
Q8. Heating sugar produces _________ and water droplets.
Q9. Iron sulfide is a _________ formed by heating iron and sulfur.
Q10. _________ is used to make buildings and vehicles due to its strength and light weight.
Very Short Answer Questions
Q1. Why is poha a non-uniform mixture?
Q2. What gases are produced when electricity is passed through water?
Q3. How is a compound different from its elements?
Q4. Name one use of the compound sodium chloride in daily life.
Q5. Why are native minerals considered elements?
Short Answer Type Questions
Q1. How can you confirm the presence of carbon dioxide in air?
Q2. Why is stainless steel stronger than pure iron?
Q3. What happens when iron and sulfur are heated together, and how does it differ from their mixture?
Q4. Why is sugar considered a compound and not an element?
Q5. How are elements like aluminium and compounds like water used in daily life?
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FAQs on Worksheet: Nature of Matter: Elements, Compounds, and Mixtures - Science Curiosity Class 8 - New NCERT
| 1. What is the definition of a compound in chemistry? |  |
Ans. A compound is a substance formed when two or more elements chemically bond together in fixed proportions. Compounds have unique properties that differ from those of the individual elements that compose them.
| 2. How is common salt classified in terms of chemical substances? | |
Ans. Common salt, known scientifically as sodium chloride (NaCl), is classified as an ionic compound because it is formed from the electrostatic attraction between positively charged sodium ions (Na⁺) and negatively charged chloride ions (Cl⁻).
| 3. What distinguishes a mixture from a compound? | |
Ans. A mixture is a combination of two or more substances that are not chemically bonded, allowing each substance to retain its individual properties. In contrast, a compound's elements are chemically bonded, resulting in a new substance with distinct characteristics.
| 4. Can you provide an example of a mixture and explain its properties? | |
Ans. An example of a mixture is salad, which contains various ingredients like lettuce, tomatoes, and cucumbers. The components of the salad retain their individual properties and can be separated physically, unlike a compound where separation requires chemical reactions.
| 5. What are some common methods used to separate mixtures? | |
Ans. Common methods to separate mixtures include filtration, where solid particles are separated from liquids; distillation, which separates liquids based on boiling points; and chromatography, which separates components based on their movement through a medium.
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