Table of contents

1. Intro to General Chemistry3h 48m
2. Atoms & Elements4h 16m
3. Chemical Reactions4h 10m
4. BONUS: Lab Techniques and Procedures1h 38m
5. BONUS: Mathematical Operations and Functions48m
6. Chemical Quantities & Aqueous Reactions3h 53m
7. Gases3h 49m
8. Thermochemistry2h 37m
9. Quantum Mechanics2h 58m
10. Periodic Properties of the Elements3h 9m
11. Bonding & Molecular Structure3h 29m
12. Molecular Shapes & Valence Bond Theory1h 57m
13. Liquids, Solids & Intermolecular Forces2h 23m
14. Solutions3h 1m
15. Chemical Kinetics2h 53m
16. Chemical Equilibrium2h 29m
17. Acid and Base Equilibrium5h 1m
18. Aqueous Equilibrium4h 47m
19. Chemical Thermodynamics1h 50m
20. Electrochemistry2h 42m
21. Nuclear Chemistry2h 36m
22. Organic Chemistry5h 7m
23. Chemistry of the Nonmetals2h 39m
24. Transition Metals and Coordination Compounds3h 16m

6. Chemical Quantities & Aqueous Reactions

Molecular Equations

General Chemistry

6. Chemical Quantities & Aqueous Reactions

Molecular Equations

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Multiple Choice

Which of the following is the correct molecular equation for the reaction between strontium nitrate and potassium iodate?

Sr(NO3)2(aq) + KIO3(aq) → Sr(IO3)2(s) + KNO3(aq)

Sr(NO3)2(aq) + 2KIO3(aq) → Sr(IO3)2(s) + 2KNO3(aq)

Sr(NO3)2(s) + 2KIO3(aq) → Sr(IO3)2(aq) + 2KNO3(aq)

Sr(NO3)2(aq) + KIO3(aq) → Sr(IO3)2(aq) + KNO3(s)

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Verified step by step guidance

Identify the reactants and products in the given chemical reaction. The reactants are strontium nitrate \( \text{Sr(NO}_3\text{)}_2 \) and potassium iodate \( \text{KIO}_3 \). The products are strontium iodate \( \text{Sr(IO}_3\text{)}_2 \) and potassium nitrate \( \text{KNO}_3 \).

Determine the physical states of each compound. Strontium nitrate \( \text{Sr(NO}_3\text{)}_2 \) and potassium iodate \( \text{KIO}_3 \) are aqueous \((aq)\), meaning they are dissolved in water. Strontium iodate \( \text{Sr(IO}_3\text{)}_2 \) is a solid \((s)\), indicating it precipitates out of the solution. Potassium nitrate \( \text{KNO}_3 \) remains aqueous \((aq)\).

Write the balanced molecular equation. Balance the equation by ensuring the number of atoms of each element is the same on both sides of the equation. Start by balancing the strontium \( \text{Sr} \) and nitrate \( \text{NO}_3 \) ions, then balance the potassium \( \text{K} \) and iodate \( \text{IO}_3 \) ions.

Check the stoichiometry of the reaction. The balanced equation should reflect the correct stoichiometric coefficients. For every one mole of strontium nitrate \( \text{Sr(NO}_3\text{)}_2 \), two moles of potassium iodate \( \text{KIO}_3 \) are required to produce one mole of strontium iodate \( \text{Sr(IO}_3\text{)}_2 \) and two moles of potassium nitrate \( \text{KNO}_3 \).

Verify the balanced equation: \( \text{Sr(NO}_3\text{)}_2(aq) + 2\text{KIO}_3(aq) \rightarrow \text{Sr(IO}_3\text{)}_2(s) + 2\text{KNO}_3(aq) \). Ensure that the equation is consistent with the law of conservation of mass, where the total number of atoms for each element is equal on both sides of the equation.