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Each of the following diagrams represents a reaction showing the activation energy. Which reaction has the fastest rate?

The temperature of a gas at 1.00 atm and 8.00 °C is increased to 20.0 °C, resulting in a change of pressure. What is the new pressure? Assume the volume is constant.

According the balanced equation for the combustion reaction of butane (C4H10) below, how many grams of water can be produced when 1.25 g of butane (C4H10) are burned in a butane lighter. Assume excess oxygen is present. Show the calculation.                              2 C4H10 (g) + 13 O2 (g) → 8 CO2 (g) + 10 H2O (l)                                                                                                                                         

Which of the following are conjugate acid-base pairs in the acid-base reaction between ethanamine (CH3CH2NH2) and water?           CH3CH2NH2 (aq) + H2O (l) ⇋ CH3CH2NH3+ (aq) + OH– (aq)    I. H2O and CH3CH2NH2 II.  H2O and OH– III. CH3CH2NH2 and CH3CH2NH3+ IV. CH3CH2NH3+ and OH–

When magnesium chloride dissolves in water, it forms _______ with water molecules.

Which of the following statements BEST describes what happens when an acid reacts with water? The acid donates a proton. Water donates a proton. Water acts as a base. Hydronium ion is formed. Hydroxide ion is formed.

What is the [H3O+] in a solution that has a [OH–] of 3.2 × 10–4 mol/L?

What is the pH of a solution with a [H3O+] of 7.9 × 10–11 mol/L?

Alpha activity has a frequency of ____ to ___

Stage N2 ends when: