## Heat Resources When does the entropy usually increase?

Some of the answers are below, maybe you can help by answering which one's correct? A. Molecule broken into two or more. B. Reaction results in increasing in No. Of gas moles. C. solid... estimate the free energy

Estimate the amount and value of “free” energy provided by two adults living in a house 14 hours a day over the six months of the heating season. Assume that both adults have a diet of 2000... Specific Heat

When 23.6 g of calcium chloride were dissolved in 300 mL of water in a calorimeter, the temperature of the water rose from 25.0 degree celsius to 38.7 degree celsius. What is the heat energy change... Heat Equation

How much heat energy is required to completely change 25 grams of ice at 0 degree Celsius to water and raise the temperature to body temperature (37 degree Celsius)?

Write a 5-7 sentence conclusions explaining the differences between ionic and covalent bonds and how this affects their reaction to heat, their solubility, and their conductivity. I need the answer to this problem and steps!

Sodium metal is sometimes used as a cooling agent in heat exchange units because of it's relatively high molar heat capacity of 28.2 J/mol C. what is the specific heat of sodium in J/g C? I need the answer to these three problems. I need the steps to these problems! Someone help please!

When 25mL of 1.0M H2SO4 is added to 50mL of 1.0M NaOH at 25c in a calorimeter, the temperature of the aqueous solution increases to 33.9C. Assuming that the specific heat of the solution is 4.18J/g...

Tell whether the temperature of the part will ever reach or exceed 135F. Use discriminant of a quadratic equation to decide. Part 2: If machine is in operation for 90 minutes before turning off, how...

Tell whether the temperature of the part will ever reach or exceed 135F. Use discriminant of a quadratic equation to decide. Part 2: If machine is in operation for 90 minutes before turning off, how... Physics - Help!

If a person burns energy at the rate of 150 Watts, how much cool water (at 50o) is needed each hour to keep the person cool by evaporation (assume no heat is lost by conduction or radiation ?   The... Calculating Enthalpy in a Calorimeter Experiment

When 25.0 mL of 1.0 M H2SO4 is added to 50.0mL of 1.0M of NaOH at 25.0 degrees C in a calorimeter, the temperature of the aqueous solution increases to 33.9 degrees C. Assuming that the specific heat... Do you think that potassium could be detected visually in the presence of sodium by heating this mixture in a flame?

In a flame test experiment, sodium gives the brightest and most persistent color in the flame. Do you think that potassium could be detected visually in the presence of sodium by heating this mixture... Really need clarification for this.

in a thermal pot, there is a layer of vacuum in the outer wall, an inner pot lid and an outer pot lid.    Please help me to clarify these questions:     1.... State of Matter Change

State Change: Liquid to Solid. Name: Freezing. Energy: Less. Particle Motion: Slower. Heat: Released.   State Change: Gas to Liquid.    State Change: Gas to Solid.   State... Heat needed? Energy needed?

a. Calculate the amount of heat needed to warm 24.6 kg of water from a room temperature of 20.0°C to 60.0°C for use in a dishwasher. b. If the water heater has an efficiency of 61%, how much... Heat transfer between metal and water, what amount of water is boiled?

You place a very hot piece of aluminum (T=120 degrees C, c=900 J/(kg*degrees C) into a 500ml beaker of water that is already at an initial temperature of 90.0 degrees C. The mass of this piece of... find the delta H

Δ2HF + PbCl2→2HCl(g) + PbF2     ΔHf = +90KJ. Find the ΔHf of PbF2