Question

read each question. follow the instructions to answer the questions. 1. what is a mixture? a. a single substance b. a liquid that dissolves other substances c. a combination of substances that keep their own properties d. a combination of substances that change into something new 2. what does it mean for a substance to maintain its physical properties in a mixture? a. it changes color b. it becomes a new substance c. it keeps its original characteristics d. it changes to match the other substances in the mixture 3. which of the following are examples of a mixture where substances maintain their physical properties? circle (two) correct answers. a. oil and water b. a cooked egg c. iron filings and sand d. a melted chocolate bar 4. yovanna mixed 15 grams of gray iron filings with 15 grams of white sand. the resulting mixture is white with gray flecks. which physical property would make it easiest for yovanna to separate the mixture into its parts? a. color b. texture c. magnetism d. temperature

Explanation:

Question 1

A mixture is defined as a combination of two or more substances where each substance retains its own chemical and physical properties (they don't chemically react to form a new substance). Option A is wrong because a mixture has multiple substances. Option B describes a solvent, not a mixture. Option D describes a chemical reaction (forming a new substance), which is not a mixture. Option C matches the definition of a mixture.

Maintaining physical properties in a mixture means the substance does not undergo a change that alters its fundamental characteristics (like state, color, density - unless due to physical mixing, but not a chemical change). Option A (changing color) is a change, B (becoming a new substance) is a chemical change, D (changing to match others) is not maintaining properties. Option C (keeping original characteristics) is correct.

A mixture where substances maintain properties is a heterogeneous mixture (or even homogeneous, but substances don't react). Oil and water: oil and water don't react, each keeps properties (oil floats, water is below). Iron filings and sand: iron and sand don't react, each keeps properties (iron is magnetic, sand isn't, etc.). A cooked egg is a chemical change (protein denaturation), so B is out. A melted chocolate bar: if it's just melted, it's still chocolate (but if we consider, but melted chocolate is a physical change, but the question is about mixtures with multiple substances? Wait, a melted chocolate bar is a single substance (chocolate) in liquid form, so not a mixture of different substances maintaining properties. So A and C are correct.

Answer:

C. a combination of substances that keep their own properties

Question 2