Skip to main content
ScienceVerse

← Back to Molecules

Molecules quiz

All 8 questions. After you submit, each question shows the right answer and why. Back to the quick check

ExplorerQuestion 1 of 8

A water molecule is shaped like a straight line.

ExplorerQuestion 2 of 8

A water molecule is H₂O. How many hydrogen atoms does one water molecule have?

InvestigatorQuestion 3 of 8

Solid table salt is made of separate NaCl molecules.

InvestigatorQuestion 4 of 8

Acetic acid has the molecular formula C₂H₄O₂. What is its empirical formula?

ScientistQuestion 5 of 8

Using abridged atomic weights C = 12.011 and O = 15.999, calculate the molar mass of carbon dioxide, CO₂, in g/mol (to three decimal places).

ScientistQuestion 6 of 8

Water has four electron groups around oxygen, like methane has around carbon. Why is water's H–O–H angle (about 104.5°) smaller than the ideal tetrahedral 109.5°?

AdvancedQuestion 7 of 8

Use VSEPR reasoning to explain why CO₂ is linear but H₂O is bent.

ExpertQuestion 8 of 8

How many water molecules are in 9.0075 g of water, taking M(H₂O) = 18.015 g/mol and the Avogadro constant as 6.022 140 76 × 10²³ mol⁻¹? Give the answer in units of 10²³ to three significant figures.