Chemistry Final Exam Review

Front

Which group has the least electronegative elements?

Back

Alkali Metals are the least electronegative group in the periodic table.

Front

What type of reaction produces carbon dioxide and water?

Back

Combustion reactions produce carbon dioxide and water as products.

Front

What is the difference between a neutral atom and its isotope?

Back

Isotopes of an element differ in the number of neutrons.

Front

What condition must be true for a precipitate to form in a reaction?

Back

At least one product must be insoluble in water.

Front

How do you determine the empirical formula from percentage composition?

Back

Convert percentages to grams, then to moles, and simplify the ratio.

Front

What is the empirical formula of a compound with 61.24% oxygen and 38.76% chlorine?

Back

The empirical formula is Cl₂O₇.

Front

Define electronegativity.

Back

Electronegativity is the tendency of an atom to attract electrons in a chemical bond.

Front

What is a combustion reaction?

Back

A combustion reaction is a chemical reaction that occurs when a substance reacts with oxygen, producing heat and light.

Front

What are isotopes?

Back

Isotopes are variants of a chemical element that have the same number of protons but different numbers of neutrons.

Front

What is a precipitate?

Back

A precipitate is a solid that forms and settles out of a liquid mixture during a chemical reaction.