Question

your teacher hands you a clear liquid and asks you to classify it. you and your lab partner perform a sample of tests and get the following results.

1. after evaporation, no substances remain.
2. no residue remains in paper after filtering.
3. boiling point is low (compared to water).

where on the venn diagram would you place your mystery substance?
venn diagram with labels compounds, mixtures, and overlapping regions; options a, b, c, d with a highlighted initially

Explanation:

Step1: Analyze the Venn diagram

The Venn diagram has two main circles: Mixtures (left) and Compounds (right), with an overlapping region (C) and unique regions (B for Mixtures only, D for Compounds only, A is outside? Wait, no, looking at the labels: A is the area for Mixtures only (B), Compounds only (D), and overlap (C). Wait, the Mixtures circle has B: physically combined, variable proportions, components retain properties. Compounds circle has D: chemically combined, fixed proportions, components change properties. Overlap C: made of elements, 2 or more components.

Step2: Analyze the mystery substance's properties

1. After evaporation, no substances remain: so it's not a mixture with residue or a compound that leaves something? Wait, no—if after evaporation nothing remains, maybe it's a mixture that's a solution (like a liquid mixture) but evaporates completely? Wait, no, the properties: no residue after filtering (so it's a homogeneous mixture, maybe a solution), boiling point is low (compared to water? Wait, water's boiling point is 100°C, low boiling point might mean it's a mixture? Wait, no—wait, compounds have fixed boiling points, mixtures can have variable (but if it's a solution, maybe? Wait, no, let's re-examine the Venn:

Mixtures (B): physically combined, variable proportions, components retain properties. So a mixture's components keep their properties (like boiling point of a component). If the mystery substance has a low boiling point (compared to water), no residue after filtering (so homogeneous, like a solution), and after evaporation nothing remains (so maybe it's a mixture of a volatile liquid that evaporates completely). Wait, but the options: A is the area for Mixtures only (B) or Compounds only (D)? Wait, the Venn labels: A is the left circle (Mixtures) area B: physically combined, variable proportions, components retain properties. So a mixture (like a solution) would be in B (Mixtures only) because it's physically combined, variable proportions (like different concentrations), components retain properties (so the boiling point would be related to the components, but if it's a mixture with a low boiling point component that evaporates, leaving nothing? Wait, maybe the mystery substance is a mixture (homogeneous, so solution) with a volatile component that evaporates completely, so it's a mixture (physically combined, variable proportions, components retain properties—so the component with low boiling point evaporates, leaving nothing. So it should be in the Mixtures region (B or A? Wait, the Venn: Mixtures circle has B: physically combined, variable proportions, components retain properties. So the mystery substance has properties of a mixture: no residue (homogeneous), low boiling point (component's property), evaporates completely (so maybe the solvent is volatile). So it's a mixture, so in the Mixtures region (B, which is part of the Mixtures circle, labeled B, and the area A is outside? Wait, the options are A, B, C, D. Looking at the diagram: A is the leftmost area (Mixtures only: B), B is the Mixtures circle's unique part, C is overlap, D is Compounds circle's unique part. Wait, the problem's options: A, B, C, D. Let's check the properties:

- Mixtures (B): physically combined, variable proportions, components retain properties. So a mixture's components keep their properties (like boiling point of a component). The mystery substance has a low boiling point (compared to water), no residue after filtering (homogeneous mixture, solution), and after evaporation, no substances remain (so the solute? No, wait, if after evaporation nothing remains, maybe it's a mixture of a liquid that evaporates completely, like alcohol and water? But no residue after filtering (so homogeneous), boiling point low (so maybe a mixture of a volatile liquid). So it's a mixture, so in the Mixtures region (B or A? Wait, the Venn: the Mixtures circle is labeled B (physically combined, etc.), so the answer should be B? Wait, no, the initial selection was A, but maybe I misread. Wait, the problem's options: A is the left circle (Mixtures) area, B is the middle? Wait, the diagram: Mixtures (left circle) has B: physically combined, variable proportions, components retain properties. Compounds (right circle) has D: chemically combined, fixed proportions, components change properties. Overlap C: made of elements, 2 or more components. So the mystery substance: after evaporation, no substances remain (so maybe it's a mixture that's a solution with a volatile solvent that evaporates, leaving no residue? Wait, no—if it's a compound, after evaporation, it would leave the compound (if it's a solid compound dissolved, but no residue after filtering, so maybe it's a liquid compound? No, compounds have fixed boiling points. Wait, the boiling point is low (compared to water), so maybe it's a mixture (like a solution of a volatile liquid in water, but after evaporation, nothing remains? That doesn't make sense. Wait, maybe the mystery substance is a mixture (homogeneous, so solution) with a component that evaporates completely, so it's a mixture (physically combined, variable proportions, components retain properties), so it's in the Mixtures region (B, which is the left circle's unique area). But the initial selection was A, but maybe I made a mistake. Wait, the problem's options: A is the leftmost (Mixtures only), B is next? Wait, the labels: A is the area for Mixtures (B) and Compounds (D) and overlap (C). Wait, maybe the correct answer is B (Mixtures region) because it's a mixture. But let's re-express:

Properties:
1. After evaporation, no substances remain: so the substance is a mixture of a volatile component that evaporates, leaving nothing (so maybe the solvent is the volatile part, and there's no solute? No, that would be a pure substance, but pure substances are elements or compounds. Wait, confusion. Wait, the Venn: Compounds (D) are chemically combined, fixed proportions, components change properties. Mixtures (B) are physically combined, variable proportions, components retain properties. So if the mystery substance has a low boiling point (component's property, so retains property), no residue after filtering (homogeneous, so solution), and after evaporation nothing remains (so the component with low boiling point evaporates, leaving nothing—maybe it's a mixture of a gas dissolved in liquid? No, evaporation of liquid. Wait, maybe the answer is B (Mixtures region) because it's a mixture. So the correct region is B (Mixtures only), which is labeled as B in the options. Wait, the options are A, B, C, D. The diagram: A is the left circle (Mixtures) area B: physically combined, variable proportions, components retain properties. So the mystery substance is a mixture, so in B. But the initial selection was A, maybe I misread. Wait, the problem's question: "Where on the Venn Diagram would you place your mystery substance?" The options are A, B, C, D. Let's re-express the Venn:

- Region B (Mixtures only): physically combined, variable proportions, components retain properties.
- Region D (Compounds only): chemically combined, fixed proportions, components change properties.
- Region C (Overlap): made of elements, 2 or more components.

The mystery substance: no residue after filtering (homogeneous, so mixture), boiling point low (component's property, so retains property), after evaporation no substances remain (so maybe the mixture is a solution of a volatile liquid that evaporates completely, so it's a mixture with variable proportions (like different concentrations), physically combined, components retain properties (so the low boiling point is a component's property). So it's a mixture, so in Region B (Mixtures only). So the answer is B.

Wait, but the initial selection in the image is A, but maybe that's wrong. Let's check again:

Mixtures: physically combined, variable proportions, components retain properties. So a mixture's components keep their properties (e.g., boiling point of a component). If the mystery substance has a low boiling point (compared to water), that's a component's property, so it retains the property—so it's a mixture. So it should be in the Mixtures region (B). So the correct answer is B.

Answer:

B