APA Chemistry Fall Semester Review

APA Chemistry Fall Semester Review

Assessment

Flashcard

Chemistry

10th Grade

Hard

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15 questions

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1.

FLASHCARD QUESTION

Front

What is the electron configuration for Rubidium (Rb)?

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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