What is the electron configuration for Rubidium (Rb)?
APA Chemistry Fall Semester Review

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Chemistry
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10th Grade
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Hard
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1.
FLASHCARD QUESTION
Front
Back
1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s¹
2.
FLASHCARD QUESTION
Front
How do you calculate the mass of a compound from moles?
Back
Mass (g) = Moles × Molar Mass (g/mol). For CaO, Molar Mass = 40.08 (Ca) + 16.00 (O) = 56.08 g/mol. Thus, 1.6 moles × 56.08 g/mol = 89.728 g, rounded to 90 g.
3.
FLASHCARD QUESTION
Front
What indicates a chemical change?
Back
A chemical change is indicated by the production of gas, color change, temperature change, or formation of a precipitate. Example: Gas is produced when sodium mixes with water.
4.
FLASHCARD QUESTION
Front
What is the name of K₃PO₄?
Back
Potassium phosphate.
5.
FLASHCARD QUESTION
Front
How do you determine the number of protons in an element?
Back
The number of protons is equal to the atomic number of the element. For the element with isotopes given, the atomic number is 33.
6.
FLASHCARD QUESTION
Front
What is the molar mass of CaO?
Back
Molar mass of CaO = 40.08 g/mol (Ca) + 16.00 g/mol (O) = 56.08 g/mol.
7.
FLASHCARD QUESTION
Front
What is the significance of isotopes in chemistry?
Back
Isotopes are variants of a chemical element that have the same number of protons but different numbers of neutrons, affecting their mass.
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