study the graph  What is true according to the information in the graph? A) The enthalpy of the reaction is positive.   B) The reaction is an exothermic reaction.   C) The reaction releases energy to its surroundings.   D) The enthalpy of the reaction is negative.

%24 An 33.777g piece of metal is heated in a hot water bath at 98.5°C and then transferred to a coffee-cup calorimeter containing 50.0mL of water. The initial water temperature was 22.9°C and the final water temperature was 27.3°C. Determine the specific heat of the metal (Cmetal). Ccal = 21.0J/°C & Cwater = 4.184 J/g*°C. Report your answer to 3 sf and in J/g*°C. Your Answer: Answer units MacBook Air DII DD 000 吕0 F9 F10 F7 F8 F6 F5 F3 F4 * #3 7 8 9 4

When 1.42 g of iron reacts with 1.80 g of chlorine, 3.22 g of iron(II) chloride (FeCl2, molar mass = 126.75 g/mol) and 6.8 kJ of heat is produced. What is the enthalpy change for the reaction when 1 mole of iron(II) chloride is produced? round to sig figs

If 87 J of heat are added to a balloon, causing it to expand from 1.0 L to 1.4 L under 0.97 atm of pressure, what is the change in energy of the balloon (in joules)?

When two solutions are combined in a test tube, they quickly react and the test tube containing the reaction becomes instantly hot to the touch. Is this reaction exothermic or endothermic? Briefly explain how you know.

For an exothermic reaction, how is the measured temperature change affected if some of the heat produced transfers to the calorimeter? How will the determination of the specific heat of the metal be affected if the thermometer used to record the temperature of the water bath reads too low?

An unknown 10 gram sample in a lab required 44.9 Joules of energy to change the temperature 10 degrees Celsius.  What was the specific heat of this element?  Using the specific heat, find the likely element using your Reference Table.

During an endothermic chemical reaction, a system becomes [Select] [Select] in potential energy. and the chemical substances undergo an

In an experiment, 26.5 g of metal was heated to 98.0°C and then quickly transferred to 150.0 g of water in a calorimeter. The initial temperature of the water was 22.5°C, and the final temperature after the addition of the metal was 32.5°C. Assume the calorimeter behaves ideally and does not absorb or release heat.

Rachel West Section 017 A thermometer placed in a solution undergoing a chemical reaction indicates an increase in temperature as ie reaction proceeds. Is this reaction endorhermic or exothermic? Describe if heat energy is lost or gained Trom the reaction (the system) to the surroundings. What is the sign of the enthalpy change (AH) of this reaction? A student performs a reaction and determines the enthalpy change (AH) to be 31.4 kJ. Will the cemperature of the surrounding solution increase or decrease as a result of this chemical process?