AP Chemistry - Unit 1 Review

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•
Chemistry
•
11th Grade
•
Hard
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15 questions
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1.
FLASHCARD QUESTION
Front
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.
2.
FLASHCARD QUESTION
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.
3.
FLASHCARD QUESTION
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).
4.
FLASHCARD QUESTION
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.
5.
FLASHCARD QUESTION
Front
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.
6.
FLASHCARD QUESTION
Front
What is the electron configuration for a neutral Scandium (Sc) atom?
Back
7.
FLASHCARD QUESTION
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.
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