Which symptom most suggests referred cardiac pain?

The reaction NH3(g)+HCl(g)→NH4Cl(s)\mathrm{NH_3(g) + HCl(g) \rightarrow NH_4Cl(s)}NH3​(g)  +  HCl(g) → NH4​Cl(s) is spontaneous at room temperature. Using the thermodynamic data below, determine the temperature above which the reaction is no longer spontaneous. Substance S∘S^\circ (J·mol⁻¹·K⁻¹) ΔHf∘\Delta H_f^\circ​ (kJ·mol⁻¹) NH₃(g) 193.0 –46.3 HCl(g) 187.0 –92.3 NH₄Cl(s) 94.56 –315.39

A female distance runner with insidious groin pain and pain at night may have:

A 55-year-old presents with bilateral hand numbness, clumsiness, and unsteady gait. Which red flag is most likely?

What is the correct name of the compound? CH₂=CHCH₃

A patient presents with progressive bilateral upper extremity weakness, difficulty grasping objects, and frequent dropping of items. He denies pain. Which condition should be suspected?

A buffer solution is prepared by mixing 0.400 mol of acetic acid (CH₃COOH) and 0.300 mol of sodium acetate (CH₃COONa) in enough water to make 1.00 L of solution. The acid dissociation constant for acetic acid is Ka​=1.8×10^5. What is the pH of the buffer solution?

What is a red flag for renal referral?

Which quantity predicts whether a reaction is spontaneous?

The element that forms the backbone of nearly all organic molecules is