Introductory Chemistry For Today
8th Edition
ISBN: 9781285644561
Author: Seager
Publisher: Cengage
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68. The warmest temperature ever measured in the United States was 134 °F on July 10, 1913, in Death Valley, California. Convert that temperature to degrees Celsius and Kelvin
Expressing amounts of energy in different energy units is necessary to solve many chemistry problems. For practice,
complete the following table.
The Joule (J) is the SI unit of energy.
1 calorie (cal) = 4.184 J
J
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kJ
566
156
0.719
A group of students has just measured the rate of change in temperature of a beaker of water. Which of the following units would be appropriate for this measurement?
degrees celcius per hour
kelvin per second
candelas per minute
moles per second
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- 1-86 The specific heats of some elements at 25oC are as follows: aluminum = 0.215 cal/g · oC; carbon (graphite) = 0.170 caI/g oC; iron = 0.107 cal/g mercury = 0.033 1 caI/g oC. (a) Which element would require the smallest amount of heat to raise the temperature of 100 g of the element by 10oC? (b) If the same amount of heat needed to raise the temperature of 1 g of aluminum by 25oC were applied to 1 g of mercury, by how many degrees would its temperature be raised? (c) If a certain amount of heat is used to raise the temperature of 1.6 g of iron by 10oC, the temperature of 1 g of which element would also be raised by 10oC, using the same amount of heat?arrow_forwardConvert the following Celsius temperatures to Kelvin and to Fahrenheit degrees. a. the temperature of someone with a fever, 39.2C b. a cold wintery day, 25C c. the lowest possible temperature, 273C d. the melting-point temperature of sodium chloride, 801Carrow_forwardConvert the following Kelvin temperatures to Celsius and Fahrenheit degrees. a. the temperature that registers the same value on both the Fahrenheit and Celsius scales, 233 K b. the boiling point of helium, 4 K c. the temperature at which many chemical quantities are determined, 298 K d. the melting point of tungsten, 3680 Karrow_forward
- Convert the boiling temperature of liquid ammonia. 28.1 F, into degrees Celsius and kelvin.arrow_forwardWhich statement about temperature is TRUE? A small block of aluminum sitting in a beaker of boiling water for several hours will have a different temperature than the boiling water. Temperature is a measure of the average kinetic energy of particles in a substance. Temperature moves from colder objects to hotter objects. A cup of boiling water and a bucket of boiling water will have different temperatures because they have different volumes.arrow_forwardChange 80 degrees Celsius to Fahrenheitarrow_forward
- Change 37 degrees Celsius to kelvinarrow_forwardA garage manager must determine the number of metal ball bearings (BBs) in a stock container by mass measurements. He counts out 5 BBs and finds their total mass to be 1.9 g. He also finds the total mass of the stock container and the BBs to be 239.3 g and the mass of an identical, empty stock container to be 115.8 g. The store manager then uses his data to calculate the number of BBs in the stock container: Average mass of one BB = 1.9/5 = 0.4 g Mass of BBs in container = 239.3 g - 115.8 g = 123.50 g Number of BBs in container = 123.50/0.4 g= 300 BBs (a) Evaluate the manager’s calculations with regard to significant digits. If necessary, rewrite any steps, recalculating with the adjusted quantities. For any step that you have to rewrite, explain why the manager’s calculation is in error. (b) Should the manager regard the answer to the calculation in (a) as a perfect measure of the number of ball bearings in the container? (c) How could the manager have changed his procedure to…arrow_forwardCalculate the amount of heat needed to boil 139. g of water (H₂O), beginning from a temperature of 85.3 °C. Round your answer to 3 significant digits. Also, be sure your answer contains a unit symbol. 00 x10 X Sarrow_forward
- What is the reason behind this? Inorder to measure the temperature of a object accurately, simple liquid-in-glass thermometer must be at the same temperature as the object.arrow_forwardIdentify the physical change from the list below: 1) Grinding coffee 2) Baking cake 3) Converting water to hydrogen and oxygen 4) Digesting a cheeseburger 5) Burning coalarrow_forwardConvert 22 °C into Fahrenheit and Kelvin temperaturesarrow_forward
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