Fall 2024 C103 E1 Practice Exam PDF

Fall 2024 C103 E1 Practice Exam Name: IU username Short Answer Section: Show all work to receive credit. Be sure to circle final answer. Worth 50 points. 1. Scientific notation, rounding and sig fig (5 points) Questi...

Fall 2024 C103 E1 Practice Exam Name: IU username Short Answer Section: Show all work to receive credit. Be sure to circle final answer. Worth 50 points. 1. Scientific notation, rounding and sig fig (5 points) Question Answer Write the number in scientific notation: 0.0000814 Write the following number as a standard number: 8.25x10-2 Round the number to three significant figures: 88.2039 Perform the operations and answer with the correct number (5.6 +7.891) of significant figures: 9.11 Perform the operations and answer with the correct number (5.6 𝑥𝑥 7.891) of significant figures: 9.11 2. Conversion questions (7 pts) How many millimeters, mm, are in 3.20 cm? If an object has a density of 8.65 g/cm 3, what is its density in units of kg/m3? Convert 5.0x1011 nm to km. If your walking pace is 4.2 miles/hr, how many minutes would it take for you to walk 7500 ft? Fall 2024 C103 E1 Practice Exam 3. Density (5 points) a. A cylinder of metal has a mass of 50.833 g. When placed in a graduated cylinder at an initial water volume of 11.10 mL, the water volume rose to 18.15 mL. What is the density of the metal cylinder in g/mL? Answer with correct significant figures. b. If you were to cut the metal cylinder in half, what would be the density of each half? Explain your reasoning. 4. (5 pts) To the correct number of significant figures, what is the temperature reading on the following Celsius thermometer? _________________°C Report this temperature in Kelvin and degrees Fahrenheit. (Show work and correct sig figs) _________________K _________________°F 2 Fall 2024 C103 E1 Practice Exam 5. (3 pts) Label the molecules in the diagram below as either elements, compounds or a mixture. (a) (b) (c) 6. (6 pts) Label solid, liquid gas. In the image below, in the empty circles, draw the molecular interactions that are going on in the sub-microscopic view of the three states of matter. And label each of the arrows with the physical phase change that is occurring with the following options: condensation deposition evaporation freezing melting sublimation 3 Fall 2024 C103 E1 Practice Exam 7. (3 pts) Accuracy and precision On the three bull's-eyes below, make marks for at least three arrows according to each description provided. The center of each bull's-eye indicates the 'true mark.' 8. (5 pts) Kinetic energy a. A car with a mass of 1,200 kg is moving at a speed of 25 m/s. What is the car's kinetic energy in joules (J)? b. The specific heat capacity of water is 4.184 J/g°C. If you used all the car's kinetic energy to heat 1500 mL (1500 g) of water, how much could you raise the water's temperature? Assume the water starts at room temperature (25°C), what is the final temperature of the water? 4 Fall 2024 C103 E1 Practice Exam 9. Specific heat (6 pts) a. Consider the following specific heats of metals. Metal Specific Heat (J/g·°C) Aluminum 0.903 Copper 0.385 Gold 0.128 Iron 0.449 Silver 0.235 If the same amount of heat is added to 50.0 g samples of each of the metals, which are all at the same temperature, which metal will reach the highest temperature? Explain your reasoning. b. A metal is thought to be copper or gold. When 18 g of the metal absorbs 58 cal, its temperature rises by 35 °C. Show all work to determine the identity of the metal. Use the specific heats from the table in part a. 10. (5 pts) Heat transfer A 75.0 g piece of metal at 200.0°C is placed into a coffee cup calorimeter containing 150.0 g of water at 20.0°C. The specific heat capacity of the metal is 0.385 J/g°C, and the specific heat capacity of water is 4.184 J/g°C. Assuming no heat is lost to the surroundings and the coffee cup calorimeter is perfectly insulated, calculate the final temperature of the water after thermal equilibrium is reached. 5