8. if the combination of iron filings and sulfur in question 7 is heated strongly, the iron reacts with the sulfur to form a solid that is no longer attracted to the magnet. would this be a mixture or a pure substance? why? 9. classify the following as mixtures or pure substances. a) a multivitamin tablet b) the blue liquid in your car’s windshield reservoir c) a ham and cheese omelet d) a diamond

Question

Accepted Answer

### Question 8:
# Explanation:
## Step1: Recall definitions
A mixture is a combination of two or more substances where each retains its properties. A pure substance (compound/element) has a fixed composition and distinct properties.
## Step2: Analyze the reaction
Iron ($Fe$) and sulfur ($S$) react (heated) to form iron sulfide ($FeS$), a compound with a fixed $Fe:S$ ratio and new properties (not magnetic like $Fe$).
## Step3: Classify the product
Since $FeS$ has a fixed composition (not a mix of $Fe$ and $S$ anymore) and unique properties, it's a pure substance (compound).
# Answer:
This is a pure substance (specifically a compound). Because iron and sulfur reacted chemically to form iron sulfide, which has a fixed chemical composition and distinct properties different from the original iron and sulfur, so it is not a mixture (where components retain their properties) but a pure substance.

### Question 9 (Classify each):
#### a) A multivitamin tablet:
# Explanation:
## Step1: Identify components
Multivitamin tablets contain multiple vitamins, minerals, binders, etc.
## Step2: Check mixture criteria
These components are physically combined (no chemical reaction to form a new substance with fixed composition), so it's a mixture (specifically a heterogeneous or homogeneous mixture, likely heterogeneous as components can be distinguishable in some cases, but overall a mixture of different substances).
# Answer (for a):
Mixture. A multivitamin tablet contains multiple different substances (vitamins, minerals, excipients) physically combined, not a single pure substance.

#### b) The blue liquid in your car’s windshield reservoir:
# Explanation:
## Step1: Identify components
Windshield washer fluid is a mixture of water, cleaning agents, dyes (for color), etc.
## Step2: Check mixture criteria
These are physically mixed (no chemical reaction to form a new compound with fixed composition), and it's a homogeneous mixture (uniform throughout).
# Answer (for b):
Mixture (homogeneous). The blue windshield fluid is a uniform blend of water, cleaning chemicals, dye, etc., so it's a mixture.

#### c) A ham and cheese omelet:
# Explanation:
## Step1: Identify components
Contains ham, cheese, eggs, possibly seasonings—multiple substances.
## Step2: Check mixture criteria
These are physically combined (no chemical reaction to form a single substance with fixed composition), and it's a heterogeneous mixture (components like ham chunks, cheese, egg can be seen as distinct).
# Answer (for c):
Mixture (heterogeneous). A ham and cheese omelet has distinct components (ham, cheese, egg) physically combined, so it's a mixture.

#### d) A diamond:
# Explanation:
## Step1: Recall diamond's composition
Diamond is pure carbon ($C$) with a specific crystal structure.
## Step2: Check pure substance criteria
It has a fixed composition (only carbon atoms) and distinct properties (hardness, crystal structure), so it's a pure substance (element, as carbon is an element).
# Answer (for d):
Pure substance (element). A diamond is composed solely of carbon atoms in a specific structure, so it's a pure substance.

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QUESTION IMAGE

Question

Explanation:

Question 8:

Step1: Recall definitions

Step2: Analyze the reaction

Step3: Classify the product

Step1: Identify components

Step2: Check mixture criteria

Step1: Identify components

Step2: Check mixture criteria

Answer:

Question 9 (Classify each):

a) A multivitamin tablet: