A travel mug of 91∘C coffee is left on the roof of a parked car on a cold winter day. The temperature of the coffee after t minutes is given by H=91 (2) - t/14. After how many minutes will the coffee be only lukewarm (30∘C) ?

Is it possible to find density and volume of a substance with just the mass?

Why does temperature decrease with higher altitude? Air is held strongly together by gravity, so there is less heat transfer. Air density is lower, so there is less heat transfer. Air density is higher, so there is less heat transfer.

A buffer solution has 0.625 M HCN and 0.575 M CN-. If 0.030 moles of NaOH is added to 400. mL of the buffer solution, what is the pH after the addition? The pKa of hydrocyanic acid is 9.31.

Select the answer with the correct number of significant figures for each calculation. 31.580 + 4.26 = 35.8 35.84 35.840

In an ionic compound, the charges of the _ and _ must balance to produce an electrically substance.

A balloon is filled with 12L of air at a pressure of 2 atm. What is the volume of ballon if the pressure is changed to 3 atm?

What ionic bond occurs between what particles? A. Two Negative Ions B. A positive and negative ion C. Two positive ions D. Two neutral atoms

Which of the following are good traits of a hypothesis? it will be able to be tested it can predict an outcome it will explain the observations all of these

What is the mass of a box of nails

In a phase change of water between the liquid and the gas phases, 770.1 kJ of energy was released by the system. What was the product, and how much of it was formed in the phase change? (dа ta: H₂O (l) → H₂O (g) ΔH = 44.01 kJ/mol.) A.