constant pressure calorimetry

What is the heat, q, in joules transferred by a chemical reaction to the reservoir of a calorimeter containing 85 g of dilute aqueous solution (c=4.184 J/g·ºC) if the reaction causes the temperature of the reservoir to rise from 22.0 ºC to 25.0 ºC?

1070 J heat = mass x specific heat of water (given) x change in temperature heat = 85 x 4.184 (given) x (25.0∘C−22.0∘C)

Suppose you mix 100.0 g of water at 23.5 oC with 75.0 g of water at 76.8 oC. What will be the final temperature of the mixed water, in oC? Type answer:

46.3

Which statements are true concerning a substance with a high specific heat? (2)

An example substance is water. The substance cools down slowly after heating.

What is the general definition of heat capacity?

The change in heat required to change the temperature of something by one degree Celsius

40.6 °C. The digit after the decimal place is estimated because the markings go to "40"

What is the correct reading of the temperature in the pictured thermometer?

endothermic or exothermic? A process with a calculated positive q

endothermic

endothermic or exothermic? Ice melts into liquid water

endothermic

endothermic or exothermic? Solid dissolves into solution, making ice pack feel cold

endothermic

endothermic or exothermic? A process with a calculated negative q

exothermic

endothermic or exothermic? Acid and base are mixed, making test tube feel hot

exothermic

endothermic or exothermic? Wood burns in a fireplace

exothermic

What occurs in endothermic reactions? Select one:

heat energy is absorbed

When exothermic reactions occur, ______________. Select one:

heat energy is released

A calorimeter measures the __________ involved in reactions or other processes by measuring the ___________ of the materials _____________ the process. The calorimeter is ___________ to prevent transfer of heat to outside the device.

heat, temperature change, surrounding, insulated

One calorie (cal) is the amount of heat needed to _____________ the temperature of one gram of water one degree Celsius. Select one:

raise