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Questions in chemistry

📝 Answered - What are two ways in which the sun's energy can be captured and used? How can both be used in a home?

📝 Answered - Which of the following is not capable of reacting with molecular oxygen? A. SO₂ B. SO₃ C. NO D. N₂O E. P₄O₆

📝 Answered - What is the percentage of water in the hydrate [tex]CoCl_2 \cdot 6H_2O[/tex]?

📝 Answered - Which statement most accurately describes the behavior of a catalyst? A. A catalyst increases the ∆G of a reaction and hence the forward rate. B. A catalyst reduces the ∆H of a reaction and hence the temperature needed to produce products. C. A catalyst reduces the activation energy for a reaction and increases the rate of a reaction. D. A catalyst increases the equilibrium constant and final product concentrations.

📝 Answered - An energy value of \(3.313 \times 10^{-19}\) joules is needed to break a chemical bond. What is the wavelength of energy needed to break the bond? (The speed of light, \(c\), is \(3.00 \times 10^{10}\) cm/sec; Planck’s constant, \(h\), is \(6.626 \times 10^{-34}\) J⋅sec). A. \(5.00 \times 10^{18}\) cm B. \(1.00 \times 10^{15}\) cm C. \(2.00 \times 10^{5}\) cm D. \(6.00 \times 10^{-5}\) cm E. \(1.20 \times 10^{-8}\) cm Can someone explain to me how to solve this step by step?

📝 Answered - How many main layers does the planet we call Earth have?

📝 Answered - The maximum energy available for useful work from a spontaneous reaction: A. free energy B. lattice energy C. kinetic energy D. activation energy E. ionization energy

📝 Answered - Which of the following aqueous solutions would have the greatest freezing-point depression? A. 0.10 m (NH₄)₂SO₄ B. 0.10 m MnSO₄ C. 0.10 m NaF D. 0.10 m KCl E. 0.10 m CH₃OH

📝 Answered - Which of the following was NOT a conclusion of Rutherford’s gold foil experiment? A. The atom is mainly empty space B. The nucleus has a negative charge C. The atom has a dense nucleus D. Alpha particles can pass through a thin sheet of gold foil E. All of the above are correct regarding the gold foil experiment

📝 Answered - The ionization energy of an element is: a. a measure of its mass b. the energy required to remove an electron from the element in its gaseous state c. the energy released by the element in forming an ionic bond d. the energy released by the element upon receiving an additional electron e. none of the above