ΔG⦵ = ΔH⦵ TΔS⦵ sign of G‚ at a given temperature spontaneity -ve spontaneous 0 system is at equilibrium e.g. reversible chemical reaction or change in phase (at the melting or boiling point) +ve non-spontaneous / spontaneous in the reverse direction Comment: The unit for ΔG and ΔH is usually kJ mol-1‚ whereas that for ΔS is usually J mol-1 K-1. Be careful with the units in your calculations. Comment: ΔH and ΔS are essentially constant with temperature unless a phase change occurs. Example
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21 Effect of boron nitride contents on the specific heat capacity of its filled polybenzoxazine composites. Reprinted from Ref. [34]. Copyright (1999)‚ with permission from Kluwer Academic Publishers. FIGURE 22 Specific heat capacities in the temperature range between 0–80°C of neat polybenzoxazine and boron nitride. ○ – boron nitride‚ □ – polybenzoxazine. Reprinted from Ref. [34]. Copyright (1999)‚ with permission from Kluwer Academic Publishers. The results of maximum packing densities of four
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ENGINEERING THERMODYNAMICS FOR YEAR I ELECTRICAL 1 INTRODUCTION AND THE FIRST LAW OF THERMODYNAMICS All living things depend on energy for survival‚ and modern civilizations will continue to thrive only if existing sources of energy can be developed to meet the growing demands. Energy exists in many forms‚ from the energy locked in the atoms of matter itself to the intense radiant energy emitted by the sun. Many sources of energy exist: many are known‚ some perhaps unknown; but when
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is mostly nitrogen | Air availability in water is high and depends on the temperature. Diffusion is slower. More gases can be dissolved at lower temperatures. Oxygen Concentration also decreases with depth. | Nutrients | | | Temperature variation | Surface temperatures on land vary far more than in water. The highest recorded is 60°C‚ and the lowest is less than –80°C. | Water heats up more slowly than air. Temperatures in the surface ocean layers vary from 30°C at the equator to freezing point
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An intensive property is a physical quantity whose value does not depend on the amount of the substance for which it is measured. For example‚ the temperature of a system in thermal equilibrium is the same as the temperature of any part of it. If the system is divided the temperature of each subsystem is identical. The same applies to the density of a homogeneous system: if the system is divided in half‚ the mass and the volume change in the identical ratio and the density remains unchanged. According
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1. Diameter of the test tube. 1cm 2. Length of test tube. 11.5cm 3. Volume of the test tube. 9.032 4. Mass of the empty test tube. 10.35g 5. Mass of the filled test tube. 29.89g 6. Mass of liquid in test tube. 19.54 7. Temperature of the water. 22ºc Part B Aluminum Sinker 1. Mass of object. 6.87g 49.44g 2. Volume of the water in the graduated Cylinder after the addition of the object. 17.5mL 19mL 3. Volume of the object due to displacement
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the greenhouse effect. The greenhouse effect is the absorption of energy radiated from the Earth ’s surface by carbon dioxide and other gases in the atmosphere‚ causing the atmosphere to become warmer. The greenhouse effect is what is causing the temperature on the Earth to rise‚ and creating many problems that will begin to occur in the coming decades. For the last 10‚000 years‚ the Earth ’s climate has been extraordinarily beneficial to mankind. "Humans have prospered tremendously well under a benign
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actually made up of lots of tiny particles. These tiny particles move around in water when it is in its liquid form‚ but as the temperature gets lower these particles slow down and hardly move. When it gets cold enough they stick together and then what was once a liquid has now became a solid we all know as ice. Ice turns into water‚ back to a liquid‚ when the temperature of the ice cube is rising which cause the particles in the ice to move faster and is the converted into water. There are
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1-3 Systems and Control Volumes 1-4 Properties of a System Continuum 1-5 Density and Specific Gravity 1-6 State and Equilibrium The State Postulate 1-7 Processes and Cycles The Steady-Flow Process 1-8 Temperature and the Zeroth Law of Thermodynamics Temperature Scales The International Temperature Scale of 1990 (ITS-90) 1-9 Pressure Variation of Pressure with Depth 1-10 The Manometer Other Pressure Measurement Devices 1-11 The Barometer and Atmospheric Pressure 1-12 Problem-Solving Technique Step
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through and temperatures do not get very cold. The coldest temperature Maricopa had reached was 26 degrees in December. Unlike most other places‚ in Maricopa‚ rain is rare‚ and snow is unheard of. During the summer that population dwindles back to its normal numbers. Snowbirds leave back to their home states to get out of the heat. Summer temperatures can reach up to 122 degrees! A vacation to Arizona during the Summer must be carefully planned if you are not used to these high temperatures. Summer is
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