AP Chemistry - Unit 1 Review

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What is ionization energy?

Back

Ionization energy is the energy required to remove an electron from an atom in its gaseous state. It generally increases across a period and decreases down a group.

Front

How does the effective nuclear charge affect ionization energy?

Back

The effective nuclear charge is the net positive charge experienced by an electron in a multi-electron atom. A higher effective nuclear charge increases ionization energy because electrons are held more tightly to the nucleus.

Front

What is the trend of ionization energy in the periodic table?

Back

Ionization energy generally increases across a period (left to right) and decreases down a group (top to bottom).

Front

What is a pure substance?

Back

A pure substance is a material that has a constant composition and consistent properties throughout. Examples include elements and compounds.

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What is the difference between a pure substance and a mixture?

Back

A pure substance consists of only one type of particle, while a mixture contains two or more different particles that are not chemically bonded.

Front

What is the electron configuration for a neutral Scandium (Sc) atom?

Back

Front

How do you determine the empirical formula from percent composition?

Back

To determine the empirical formula, convert the percentage of each element to moles, divide by the smallest number of moles, and use the resulting ratios to write the formula.

Front

What is the empirical formula for a hydrocarbon containing 86.2% carbon?

Back

Front

What is the significance of the empirical formula?

Back

The empirical formula represents the simplest whole-number ratio of atoms in a compound, providing insight into its composition.

Front

What is the identity of Aluminum in the periodic table?

Back

Aluminum is a chemical element with the symbol Al and atomic number 13. It is a metal known for its lightweight and corrosion-resistant properties.