11. Use Appendix 4 on page A21 in the textbook or your handout to calculate AS for the following CC14(g) + 4HC1(g) CH4(g) + 4C12(g) 12. Calculate the kinetic energy of a ball, in Joules, if it has a mass of 0.25 lbs and moving at a velocity of 1.3 mi/hr?

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.

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What are some examples of exothermic and endothermic reactions or processes you've seen in real life aside from hot and cold packs?

2 moles of lithium metal reacts with liquid water to produce solid lithium hydroxide, hydrogen gas, and 402.4 kJ/mol of heat energy. a) write a balanced thermochemical equation for the reaction b) how much heat would be produced by the reaction of 14 g of lithium with an excess of liquid water  c) is the reaction endothermic or exothermic?

Alexia determined the mass of her empty Styrofoam cup calorimeter was 1.0698 g. She then added distilled water to the cup and weighed it again. The combined mass of the cup + water was 33.2191 g. What is the mass of water, in g, in Alexia's cup?

When substances are dissolved in water, they can absorb or release heat. Describe how you would use a calorimeter to determine the amount of heat required or released to when 10 grams of sugar is dissolved in 100 grams of water. Describe how you would calculate the heat absorbed or released by the sugar with the data you collect. (Do no perform any calculations.)

1. A thermometer placed in a solution undergoing a chemical reaction indicates an increase in temperature as the reaction proceeds. Is this reaction endothermic or exothermic? Describe if heat energy is lost or gained from the reaction (the system) to the surroundings. What is the sign of the enthalpy change (AH) of this reaction? 2. A student performs a reaction and determines the enthalpy change (AH) to be 31.4 kJ. Will the temperature of the surrounding solution increase or decrease as a result of this chemical process? 3. If you hold 3 grams of ice in your hand at room temperature, your hand will become cold. a) Is the reaction H,O(s) – H,O(1) endothermic or exothermic? b) In which direction does heat flow?

How much heat is released when 22.75 g oxygen gas is used in the reaction? (Pay close attention to the units your given is in! Maybe need a conversion first?)   4 Fe+ 3 O2 → 2 Fe2O3   ΔH = -1652 kJ