FBISE, NCP & NBF-aligned resources for Classes 9–12
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Chemistry Chapter 2 : Topic 5
Classification of Matter
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A student observes three substances in a laboratory: oxygen gas, distilled water, and air. He concludes that each substance belongs to a different category of matter based on its composition and properties. Which statement correctly differentiates an element from a compound and a mixture?
Reasoning: Elements contain one type of atom, compounds are chemically combined substances with fixed ratios, while mixtures are physical combinations of substances.
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A substance is found to have a fixed composition, constant melting point, and can only be broken into simpler substances through chemical reactions. Which conclusion is most appropriate?
Reasoning: Compounds have fixed composition and can only be separated chemically, unlike mixtures.
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A sample of matter shows the following properties: its components retain their individual properties, and it can be separated by simple physical methods like filtration. What type of matter is it?
Reasoning: Mixtures can be separated physically and components retain their original properties.
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Which statement best explains why compounds have different properties from their constituent elements?
Reasoning: Chemical bonding changes properties, forming a new substance with different characteristics.
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A student compares iron filings and sulfur powder with iron sulfide (FeS). He observes that iron and sulfur can be separated using a magnet, but iron sulfide cannot. What does this prove?
Reasoning: Iron and sulfur are physically mixed, while FeS is chemically combined forming a compound.
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Which of the following best describes a mixture at the particle level?
Reasoning: Mixtures involve physical combination, not chemical bonding.
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A substance has a definite chemical formula and cannot be separated by physical methods. What does this indicate?
Reasoning: Chemical formula and inability to separate physically indicate a compound.
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Which of the following is a correct difference between elements and compounds?
Reasoning: Elements are pure substances of one atom type; compounds have multiple elements chemically bonded.
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Which characteristic is NOT applicable to mixtures?
Reasoning: Mixtures do not have fixed formulas.
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A salt solution is prepared by dissolving common salt in water. Which statement is correct?
Reasoning: It is a physical combination, so it is a mixture.
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Which of the following represents a compound?
Reasoning: Water has hydrogen and oxygen chemically combined in a fixed ratio.
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Why can mixtures be separated by physical methods?
Reasoning: No chemical bonding means physical separation is possible.
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A substance shows variable composition and different samples have different ratios of components. What is it most likely?
Reasoning: Mixtures do not have fixed composition.
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Which statement correctly describes an element?
Reasoning: Elements are made of identical atoms.
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Which of the following best distinguishes compounds from mixtures?
Reasoning: Compounds are chemically bonded with fixed ratios.
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A student states: “Air is a compound because it contains oxygen and nitrogen.” Why is this statement incorrect?
Reasoning: Air is a mixture of gases, not chemically bonded.
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Which of the following processes can separate components of a compound?
Reasoning: Compounds require chemical methods to break bonds.
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Which feature is common to both elements and compounds but NOT mixtures?
Reasoning: Both are pure substances with fixed composition.
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A substance is made of two or more elements chemically combined in a fixed proportion. What law supports this?
Reasoning: Compounds always have fixed ratios of elements.
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Which of the following best represents a heterogeneous mixture?
Reasoning: Sand and water are visibly distinct components.
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Why do elements and compounds differ from mixtures in terms of melting point?
Reasoning: Pure substances have definite melting points.
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Which statement is TRUE about compounds?
Reasoning: Compounds are formed by chemical bonding.
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A substance cannot be broken into simpler substances by any chemical or physical method. What is it?
Reasoning: Elements are the simplest form of matter.
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Which of the following is NOT a property of compounds?
Reasoning: Compounds require chemical methods for separation.
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Which statement best summarizes the difference among elements, compounds, and mixtures?
Reasoning: Only mixtures are physical combinations; elements and compounds are pure substances.
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