4x Which of the following statements describes a difference between a mixture and a pure substance? dx A The density of a mixture can change with temperature, but the density of a pure substance cannot change. 4x B The composition of a mixture can vary from sample to sample, but the composition of a pure substance is always the same. C A mixture has a specific melting point, while the melting point of a pure substance can vary. D A mixture tends to be homogeneous, while a pure substance tends to be heterogeneous.

Question

4x Which of the following statements describes a difference between a mixture and a pure substance? dx A The density of a mixture can change with temperature, but the density of a pure substance cannot change. 4x B The composition of a mixture can vary from sample to sample, but the composition of a pure substance is always the same. C A mixture has a specific melting point, while the melting point of a pure substance can vary. D A mixture tends to be homogeneous, while a pure substance tends to be heterogeneous.

Answer 1

B. The composition of a mixture can vary from sample to sample, but the composition of a pure substance is always the same.

Answer 2

1. Identify Key Characteristics of Mixtures A mixture's composition can vary from sample to sample because it consists of two or more substances physically combined.2. Identify Key Characteristics of Pure Substances A pure substance has a fixed composition and consistent properties throughout, as it consists of only one type of particle.3. Compare Statements with Definitions Statement B aligns with the definitions: mixtures have variable compositions, while pure substances have constant compositions.

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