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When switching from 10× to 40× magnification, which microscope component are you changing?

Which of the following is NOT one of the elements necessary to the formation of all valid contracts?

Which part of a compound light microscope is the eyepiece that you look through and typically provides 10× magnification?

A 0.100 M solution of a weak acid, HA, has Ka = 1.8 × 10⁻⁵. Using the approximation [H₃O⁺] ≈ √(Ka × C), what is the approximate pH of the solution?

At 25°C, Kw = 1.0 × 10⁻¹⁴. A weak acid has Ka = 6.3 × 10⁻⁵. What is Kb for its conjugate base?

Equal volumes of 2.0 × 10⁻⁴ M Pb(NO₃)₂ and 2.0 × 10⁻⁴ M NaCl are mixed. After mixing, each concentration is diluted by half, so [Pb²⁺] = 1.0 × 10⁻⁴ M and [Cl⁻] = 1.0 × 10⁻⁴ M. For PbCl₂(s) ⇌ Pb²⁺(aq) + 2Cl⁻(aq), Ksp = 1.7 × 10⁻⁵. Will PbCl₂ precipitate?

A student overshoots the endpoint while titrating an unknown monoprotic acid with standardized NaOH. The student uses the larger NaOH volume in the calculation. How will this most likely affect the calculated acid concentration?

For Al(OH)₃(s) ⇌ Al³⁺(aq) + 3OH⁻(aq), let x represent the molar solubility of Al(OH)₃ in pure water. Which expression represents Ksp in terms of x?

A student begins a titration with an air bubble trapped in the buret tip. During the titration, the bubble exits and the tip fills with NaOH. How would this most likely affect the calculated concentration of the unknown acid?