Which hydrogen-to-oxygen atom ratio is found in every sample of pure water?

Two atoms or ions have different numbers of protons. What must be different about them?

Which substance cannot be broken down into simpler substances by chemical reactions?

How should pure silver chloride, AgCl, be classified?

Which box contains more than one substance?

What kind of pure substance does this particle model show?

How many atoms are represented in this molecule?

Why is solid sodium chloride not described as a collection of separate molecules?

Which type of bonding does this electron-transfer model represent?

What happens to the outer electrons between these atoms?

Acetic acid, CH₃COOH, is the acid in vinegar. Which bonding category fits this substance?

A bottle of vinegar contains acetic acid dissolved in water. How should the bottle's contents be classified?

Which description fits each molecule in this model?

Which nonmetal commonly occurs as a gas in Earth's atmosphere?

Which statement correctly compares oxygen gas, O₂, with carbon dioxide, CO₂?

What term describes diamond and graphite as distinct structural forms of carbon?

Use the atoms within each group to classify the molecules shown.

Which element helps give bones their structure and is also needed for muscle contraction?

Copper carries electric current well and can be shaped without breaking. How is it classified?

During the household-ingredient activity, which information best identifies the substances present in a cleaner?