Energy Change in Reactions - Page 6
Questions
- You have two cups full of liquid. Cup A ls 100 degrees C. Cup B is 20 degrees C. What is the difference in the kinetic energy of the molecules in each cup?
- Chemists commonly use a rule of thumb that an increase of 10 K in temperature doubles the rate of a reaction. What must the activation energy be for this statement to be true for a temperature increase from 25 to 35°C?
- Sweat evaporates off your arm. Endothermic or exothermic and why?
- Given the balanced equation representing a reaction: #H_2 -> H + H#. What occurs during this reaction?
- What does positive #DeltaH# tell about a reaction?
- What conditions make #DeltaG# always positive?
- How much heat does 32.0 g of water absorb when it is heated from 25.0 to 80.0 °C?
- Is cooling hot water an exothermic process or an endothermic process?
- What are the two types of energy changes that can occur in a chemical reaction?
- What is the difference between adiabatic process and isothermal process?
- How do you find heat in isothermal processes?
- Student A drops 3 metal washers at 75 deg C into 50 ml of 25 deg C water and student B drops 3 metal washers at 75 C into 25 ml of 25 C water. Which student will get a greater change in the temperature of the water? Why?
- What is a reaction that releases energy as it occurs classified as?
- What are the four forms of energy that may be absorbed or released during a chemical reaction?
- When 168 joules of heat is added 4 grams of water at 283 K, what is the resulting temperature?
- How do you calculate the energy needed to heat water?
- Hot coffee in a mug cools over time and the mug warms up. How would you describe the energy in this system?
- What is the energy level necessary to enable a reaction to occur called?
- Why is the dissolution of anhydrous copper sulfate exothermic, and the dehydration of #CuSO_4*5H_2O# endothermic?
- What happens when a beaker containing a solution of lithium chloride is heated?