Which diagrams are dichotomous keys?

Suppose you have designed a new thermometer called the x thermometer. on the x scale the boiling point of water is 129 ? x and the freezing point of water is 13 ? x. part a at what temperature are the readings on the fahrenheit and x thermometers the same?

What is the molar mass of a gas that has density of 2.054 g/l

Areaction is first order with respect to reactant x and second order with respect to reactant y. which statement describes the rate law for this reaction?