AP Chemistry Unit 1 Review

Front

What is the molecular formula if the empirical formula is C2H5 and the molecular molar mass is 58.14 g/mol?

Back

C4H10

Front

How many isotopes are shown in this mass spectrum?

Back

4

Front

What is the percent yield if 0.856 g of NO is actually obtained in the lab during the reaction: 4NH3 + 5O2 --> 4NO + 6H2O with 6.30g of ammonia and 1.80g of oxygen?

Back

63.4%

Front

When using water as a solvent, which type of molecule is likely to have the highest Rf value?

Back

polar

Front

What is a charged atom called?

Back

Ion

Front

Define empirical formula.

Back

The simplest whole-number ratio of atoms of each element in a compound.

Front

What is the difference between an ion and an isotope?

Back

An ion is a charged atom, while an isotope is an atom with the same number of protons but a different number of neutrons.

Front

What is the formula for percent yield?

Back

(actual yield / theoretical yield) x 100%

Front

What does Rf value stand for in chromatography?

Back

Retention factor, a measure of how far a compound travels in a solvent.

Front

What is the significance of isotopes in chemistry?

Back

Isotopes can affect the mass of an element and are used in various applications like dating and medical imaging.