Gen Chem 1 Lab: Constant Pressure Calorimetry

What is the heat, q, in joules transferred by a chemical reaction to the reservoir of a calorimeter containing 95 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 26.5 ºC?

1800

Suppose you mix 100.0 g of water at 22.1 oC with 75.0 g of water at 75.0 oC. What will be the final temperature of the mixed water, in oC?

44.8

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

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

What occurs in endothermic reactions?

Heat energy is absorbed.

When exothermic reactions occur, ______________.

Heat energy is released.

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

Raise

What is the general definition of heat capacity?

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

Determine whether each described process is endothermic or exothermic. Solid dissolves into solution, making ice pack feel cold Wood burns in a fireplace Acid and base are mixed, making test tube feel hot A process with a calculated negative q Ice melts into liquid water A process with a calculated positive q

endothermic exothermic exothermic exothermic endothermic endothermic

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;

measure temperature to

one sig fig after decimal point