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II. Past Tenses of haben and sein

I. Negations

How many mL of 0.755 M sulfuric acid solution is needed to react with 55.0 mL of 2.50 M KOH solution? Use the given balanced reaction: 2 KOH (aq) + H2SO4 (aq) → 2 H2O (l) + K2SO4 (aq)

Consider the equilibrium reaction: 2 N2O(g) ⇌ O2(g) + 2 N2(g). Which of the following will cause a shift in the equilibrium to the left? 1.  Remove N2O 2.  Remove O2 3.  Add N2

The vapor pressure of water at 20.0 °C is 17.5 mm Hg. If the pressure of a pure gas collected over this water sample was measured to be 453.0 mm Hg. What is the pressure of the pure gas?

How many total valence electrons are in the nitrate ion?

Consider a 1.6 × 10-3 M solution of HNO3. Which of the following statements is NOT true?

Which compound below is the most soluble in water based on its Ksp value?

For the reaction which is in equilibrium Ag2S(s) ⇌ 2Ag+(aq) + S2-(aq), what happens to the equilibrium position if aqueous ammonium sulfide is added?

What are the coefficients for the following reaction when it is properly balanced?___O2 + ___CH4 → ___CO2 + ___H2O