Chromate

High school (ages 12+)
Science & Technology

Name:

Date:

Step 1 · Read the article

Open the article and read it at the level above. Then answer the questions below in your own words.

https://smallwhale.org/articles/chromate

Write what each word means, using the article.

Do not copy the article. Write two things you learned, the way you would explain them to a friend.

Answers below are taken from the article’s stored facts, so they match what the student read.

1. What is the oxidation state?Chromium in chromates typically exists in the +6 oxidation state
2. What is the color mechanism?Color arises from electronic transitions within Cr(VI)-O bonds, absorbing specific light wavelengths
3. What are chromates and why do they have bright colors?Chromates are special chemicals that contain chromium in a +6 state. Their bright colors come from light being absorbed and reflected by the chromium‑oxygen bonds.
4. How were chromates used by ancient Egyptians and Romans?Ancient Egyptians and Romans used natural chromium compounds as pigments in paints and ceramics. Lead chromate, for example, gave a bright yellow color to Roman frescoes.

Chromate Anion: The CrO₄²⁻ ion, a fundamental component of chromate compounds, featuring chromium in a +6 oxidation state.
Chromate Conversion Coating (CCC): A protective surface treatment that forms a passive layer on metals using chromates to prevent corrosion.
Redox Reaction: A chemical reaction involving the transfer of electrons, where one substance is oxidized and another is reduced.