16-2

**Thermodynamics Equations Worksheet** //<---Previous Assignment - Next Assignment--->media type="custom" key="12534488"// **__Instructions__**
 * __Time Length__ **
 * 3 Days

//On a new wiki titled __16-2 Thermochemistry Equations Worksheet__ Show work for 1 random question from 7-10 and just give the answers to the rest.//

// **__Equations__** // If you melt/freeze: **q=m x H f ** If you boil/condense: **q=m x H v **
 * //q=m x c p x// ****ΔT** (you will have this equation on the taks test. It is in the Thermochemistry section on the back of your periodic table.)
 * If your temperature changes and your state (solid, liquid, gas) changes, use multiple equations and add them together. **

// **__Worksheet__** // 1) A 12 oz. can of soda weighs about 450 grams. How many joules are released when a can of soda is cooled from 25 °C (room temperature) to 4 °C (the temperature of a refrigerator). **the specific heat is 4.18 J / g°C .**

2) How many joules are required to heat 250 grams of liquid water from 0 to 1000 °C? **The specific heat of steam is 1.87 J / g°C .** **The specific heat of water is 4.18 J / g C. The Heat of vaporization is** **2260 J/g.**

3) How many joules are required to melt 100 grams of water? **The heat of fusion of water is 334 J/g.**

4) How many joules are required to boil 150 grams of water? **The heat of vaporization of water is 2260 J/g.**

5) How many joules are required to heat 200 grams of water from 25 °C to 125°C ? **The specific heat of steam is 1.87 J / g°C .**
 * the specific heat of water is 4.18 J / g°C . The Heat of vaporization is** **2260 J/g.**

6) How many joules are given off when 120 grams of water are cooled from 25°C to -250°C ? **The specific heat of ice is 2.09 J / g<span style="color: #222222; font-family: Arial,sans-serif; font-size: 14px;">°C. **
 * the specific heat of water is 4.18 J / g<span style="color: #222222; font-family: Arial,sans-serif; font-size: 14px;">°C. ****The heat of fusion of water is 334 J/g**

7) How many joules are required to heat 75 grams of water from -85<span style="color: #222222; font-family: Arial,sans-serif; font-size: 14px;">°C to 185<span style="color: #222222; font-family: Arial,sans-serif; font-size: 14px;">°C ? **The specific heat of steam is 1.87 J / g<span style="color: #222222; font-family: Arial,sans-serif; font-size: 14px;">°C. **
 * The specific heat of ice is 2.09 J / g<span style="color: #222222; font-family: Arial,sans-serif; font-size: 14px;">°C. T ****he specific heat of water is 4.18 J / g<span style="color: #222222; font-family: Arial,sans-serif; font-size: 14px;">°C. ****The heat of fusion of water is 334 J/g.** **The heat of vaporization of water is 2260 J/g.**

8) How many joules are required to heat a frozen can of juice (360 grams) from -5<span style="color: #222222; font-family: Arial,sans-serif; font-size: 14px;">°C to 110<span style="color: #222222; font-family: Arial,sans-serif; font-size: 14px;">°C ?
 * The specific heat of steam is 1.87 J / g<span style="color: #222222; font-family: Arial,sans-serif; font-size: 14px;">°C. ****The specific heat of ice is 2.09 J/g<span style="color: #222222; font-family: Arial,sans-serif; font-size: 14px;">°C. T ****he specific heat of water is 4.18 J / g<span style="color: #222222; font-family: Arial,sans-serif; font-size: 14px;">°C. ****The heat of fusion of water is 334 J/g.** **The heat of vaporization of water is 2260 J/g.**

9) How many joules are released when 450 grams of water are cooled from 407<span style="color: #222222; font-family: Arial,sans-serif; font-size: 14px;">°C to -9 <span style="color: #222222; font-family: Arial,sans-serif; font-size: 14px;">°C
 * The specific heat of steam is 1.87 J / g<span style="color: #222222; font-family: Arial,sans-serif; font-size: 14px;">°C. ****The specific heat of ice is 2.09 J / g<span style="color: #222222; font-family: Arial,sans-serif; font-size: 14px;">°C. T ****he specific heat of water is 4.18 J / g<span style="color: #222222; font-family: Arial,sans-serif; font-size: 14px;">°C. ****The heat of fusion of water is 334 J/g.** **The heat of vaporization of water is 2260 J/g.**

10) How many joules are required to raise the temperature of 100 grams of water from -269<span style="color: #222222; font-family: Arial,sans-serif; font-size: 14px;">°C (the current temperature of space) to 110 <span style="color: #222222; font-family: Arial,sans-serif; font-size: 14px;">°C
 * The specific heat of steam is 1.87 J / g<span style="color: #222222; font-family: Arial,sans-serif; font-size: 14px;">°C. ****The specific heat of ice is 2.09 J / g<span style="color: #222222; font-family: Arial,sans-serif; font-size: 14px;">°C. T ****he specific heat of water is 4.18 J / g<span style="color: #222222; font-family: Arial,sans-serif; font-size: 14px;">°C. ****The heat of fusion of water is 334 J/g.** **The heat of vaporization of water is 2260 J/g.**

11) If a reaction absorbs heat from its surroundings, do the surroundings get colder or hotter? So does that make it exothermic or endothermic.

12) if a reaction gives off heat to its surroundings do the surroundings get colder or hotter? So does that make it exothermic or endothermic.

13) If a reaction uses heat, does that make heat a product or a reactant? Would it be on the left side or right side of the arrow in a chemical reaction? Would it be exothermic or endothermic?

14) if a reaction gives off heat, does that make heat a product or a reactant? Would it be on the left side or right side of the arrow in a chemical reaction? Would it be exothermic or endothermic?