A hot dog contains 151 kcal. How many joules of energy is this?

Which of the following equation correctly determines the formula mass of sodium sulfate (Na2SO4)?

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

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

A buffer solution contains H2CO3 and HCO3–, resulting in the equilibrium shown by the reaction below. According to this reaction and Le Châtelier’s principle, what happens when acid (H3O+) is added to this buffer solution?          H2CO3 + H2O ⇋ HCO3– + H3O+

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

On a standard 30 second epoch you observe a theta background, one spindle, two 100uV K-Complexes, a run of 100uV delta waves that take up 3 seconds of the epoch. What stage is this?

Stage N2 comprises approximately _______ of total sleep time, whereas REM comprises ________.

Stage N3 is defined as: