Question

5 multiple choice 9 points a student receives a beaker that contains sand, water, and salt mixed together. the student performs a two - step process to separate all of the substances, as shown in the table. which statement best classifies the contents of the beaker?

steps	process	observation
2	heat the beaker with salt and water on a hot plate.	the water evaporates, leaving the salt as a white powder on the bottom of the beaker.

options:

• the beaker originally contains a heterogeneous mixture, but after step 1, it contains one compound.
• the beaker originally contains a heterogeneous mixture, and after step 1, it contains a homogenous mixture.
• the beaker contains a heterogeneous mixture after step 1 and a compound after step 2.
• the beaker contains a homogenous mixture after step 1 and an element after step 2.

7 multiple choice 8 points the diagram shows the atomic arrangement of two substances formed by hydrogen (h) and oxygen (o) atoms. which option correctly identifies the substances?

Explanation:

1. First, recall the definitions: A heterogeneous mixture has visibly different components (like sand, water, salt initially—sand is separate from the liquid). A homogeneous mixture has uniform composition (like salt dissolved in water, which is the liquid after Step 1). A compound is a substance with fixed composition (e.g., salt, water), and an element is a single type of atom.
2. Analyze the initial mixture: Sand, water, and salt together—sand is not dissolved, so it's a heterogeneous mixture.
3. After Step 1 (filtering), the liquid is salt dissolved in water (uniform, so homogeneous mixture), and sand is removed.
4. Check each option:

• Option 1: After Step 1, the liquid is a mixture (salt + water), not a compound. Eliminate.
• Option 2: Initial is heterogeneous (sand, water, salt with sand separate). After Step 1, salt - water is homogeneous. This matches.
• Option 3: After Step 1, it's a mixture (not a compound). After Step 2, salt is a compound (not formed as a compound here, but salt is a compound, but the step 1 mixture is not heterogeneous. Eliminate.
• Option 4: After Step 2, salt is a compound (not an element). Eliminate.

Answer:

B. The beaker originally contains a heterogeneous mixture, and after Step 1, it contains a homogenous mixture. (Assuming the second option is labeled B; adjust label based on original, but the text of the correct option is as above)