5. what is a compound? what are compounds composed of? what is true about the composition of a compound, no matter where we happen to find the compound?
6. the composition of a given pure compound is always ______ no matter what the source of the compound.
7. if iron filings are placed with excess powdered sulfur in a beaker, the iron filings are still attracted by a magnet and could be separated from the sulfur with the magnet. would this combination of iron and sulfur represent a mixture or a pure substance?

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Accepted Answer

### Question 5
# Brief Explanations:
A compound is a pure substance made of two or more elements chemically combined in a fixed ratio. Compounds are composed of atoms of different elements bonded (ionic/covalent). The composition (element ratio) is fixed, e.g., $ \ce{H_2O} $ always has 2 H : 1 O, regardless of source.
# Answer:
- A compound: A pure substance formed when two or more different elements chemically combine in a fixed proportion.
- Composed of: Atoms of two or more different elements, held together by chemical bonds (ionic, covalent, etc.).
- True about composition: The ratio of elements in a compound is **fixed** (e.g., $ \ce{CO_2} $ always has 1 C : 2 O), so its composition is uniform and constant, no matter the source or location.

### Question 6
# Brief Explanations:
For a pure compound, the law of definite proportions states its elemental composition (type and ratio of atoms) is constant, regardless of the source (e.g., $ \ce{H_2O} $ from a river or a lab has 2 H : 1 O). So the composition (element ratio) is always the same.
# Answer:
The composition of a given pure compound is always $\boldsymbol{\text{the same}}$ no matter what the source of the compound.

### Question 7
# Step-by-Step Format:
## Step1: Analyze the mixture/pure substance
- **Mixture**: Iron filings + powdered sulfur (excess) is a mixture (physical combination, no chemical reaction yet).
- **Pure substance**: If iron and sulfur reacted (e.g., heated to form iron sulfide, $ \ce{FeS} $ or $ \ce{FeS_2} $), it would be a compound (pure substance). But here, they are mixed (not reacted), so it’s a mixture.

## Step2: Separation with a magnet
- Iron is magnetic; sulfur is not. In a mixture, the magnet attracts only iron filings (physical property), leaving sulfur behind.
- If it were a pure compound (e.g., $ \ce{FeS} $), iron is chemically bonded to sulfur—no free iron to attract, so the magnet would not separate iron from sulfur.

## Step3: Identify the combination
Since iron is attracted (showing it’s a separate component), the combination is a **mixture** (of iron and sulfur).
# Answer:
- Separation: Yes, iron filings (magnetic) can be separated from non - magnetic sulfur using a magnet.
- Combination type: This combination represents a $\boldsymbol{\text{mixture}}$ (because the components retain their individual properties, and physical separation is possible).

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