Chemistry Fall Semester Review 2024

Front

What does the mass on the periodic table represent?

Back

The mass represents the atomic mass unit, and average atomic mass is calculated by taking the weighted average of all isotopes.

Front

How is average atomic mass calculated?

Back

Average atomic mass is calculated by taking the weighted average of all isotopes.

Front

Which has a greater number of particles: 2.1 mols of Pb or 2.4 mols of Si?

Back

2.4 mols of Si.

Front

What are the steps to convert from grams of a substance to atoms?

Back

1. Determine the molar mass. 2. Convert grams to moles. 3. Use Avogadro's number to find atoms.

Front

Define isotope.

Back

An isotope is a variant of a particular chemical element which differs in neutron number.

Front

What is the empirical formula for C₁₈H₃₄O₁₆?

Back

C₉H₁₇O₈.

Front

What is the empirical formula for H₄O₂?

Back

HO.

Front

What is the empirical formula for C₃H₆?

Back

C₃H₆.

Front

What is the empirical formula for C₆H₁₂O₆?

Back

CH₂O.

Front

What is the empirical formula for X₃₉Y₁₃?

Back

XY.