Question

warm-up active
review
analyze and classify a chemical reaction
how do you know there was a chemical reaction?
check all indicators below.
□ a solid precipitate formed.
□ the color changed.
□ a gas was produced.
□ the reaction absorbed or released heat.
done
fill in the blanks in the sentence below.
in the reaction at blood falls, iron and oxygen combine to form iron oxide, which is called rust (water is also present). the reactants are
✓ oxygen and iron , and the product is
✓ iron oxide.

Explanation:

1. For the indicator question: The image shows Blood Falls, where iron reacts to form reddish-brown iron oxide (rust). The distinct color change from the original iron/oxygen to the rust is visible. A solid precipitate (rust) is formed as the product. There is no visible gas production, and heat change is not an observable indicator here.
2. For the fill-in-the-blank: The question explicitly states iron and oxygen combine to form iron oxide, so these are the reactants and product respectively.

Answer:

Checked indicators:

• A solid precipitate formed.
• The color changed.

Fill-in-the-blank answers:

• The reactants are oxygen and iron
• The product is iron oxide