Which of the following combinations will result in a reaction that is only spontaneous at low temperatures?  Negative enthalpy change and negative entropy change  Negative enthalpy change and positive entropy change  Positive enthalpy change and negative entropy change  Positive enthalpy change and positive entropy change

Q: Briefly distinguish between Entropy and Energy

A: Thermodynamic is the branch of chemistry that mainly deals with the heat transfer between system and…

Q: When a system ________, ΔE is always negative.     absorbs heat and does work     gives off heat…

A: Given, ΔE is always negative

Q: how is the caloric value of a food sample determined?

A: Calorific value is defined as the amount of energy contained in per Kg of the food.

Q: If a reaction takes place in a water-based calorimeter and the temperature of the water increases,…

A: given  water bases calorimeter Temperature of water is increasing Nature of Reaction = To be…

Q: Explain How You Will Calculate The Molar ΔHsoln For A Compound Using Coffee Cup Calorimetry

A: To calculate the molar enthalpy of solution (ΔHsoln) for a compound using coffee cup calorimetry,…

Q: 20. Thermal equilibrium is reached when energy moves from the substance with lower energy to higher…

A: To explain: Thermal equilibrium.

Q: P4(s) + 10 Cl2(g) → 4 PCl5(s)     ΔH = −1821 kJ When  [X] g of P4 react, 1821 kJ are released…

A:

Q: Calculate the required value for each reaction. 2H2 + O2→ 2H2O + 286 kJ A) what amount of energy…

A: The given data contains, Number of moles of hydrogen = 450 moles The given reaction is, 2H2 + O2…

Q: A researcher studying the nutritional value of a new candy places a 3.70 g sample of the candy…

A: We will first calculate the energy. after doing so, we will divide with grams of candy to get energy…

Q: Please determine the enthalpy (in kJ/mol) of the balanced thermochemical equation when 2.15 g of…

A: The mass of the solution is the same as the mass of water and the mass of the 25.4 mL of water is…

Q: Two pieces of metal (A and B) are in contact with each other and initially at different…

A: For Metal A: mass of metal A = 7.50 g Initial Temperature = 24 oC Final Temperature = 35 oC Change…

Q: Solid carbon graphite reacts with oxygen gas to release of 393.7 kJ per mole of carbon dioxide gas…

A:

Q: When 1.00 g of AgCl is formed by the reaction in a coffee cup calorimeter, the temperature of 20.0 g…

A: Heat absorbed by water can be calculated by using the formula:Q = m.Cp.∆T where, Q = heat absorbed/…

Q: Two pieces of metal (A and B) are in contact with each other and initially at different…

A:

Q: After determining the ΔH of reactions, explain what does the numerical difference represent, in…

A: Enthalpy change of a reaction, ΔH can be either positive or negative numerically.

Q: If the sign of AT is negative, is a substance gaining or loosing heat? Explain. How much heat is…

A: According to the law of calorimetry, Heat absorbed by a system = heat released by the system.

Q: Which of the following statements correctly describes the direction of heat transfer? O from high…

A: Heat is a form of energy also called heat energy or thermal energy.

Q: Which law of Thermodynamics explains why the "house always wins"? In other words, when it comes to…

A: Laws of thermodynamics states as– First law– Energy can neither be created nor be destroyed. It can…

Q: Exothermic Endothermic Honer than suroundings Heat Heat Cooler than sunoundinge Heal Neal Heal Heat…

A: We know that,  Entropy measure randomness. It means that, more randomness means more entropy as like…

Q: 10.0 g sample of water at 20.0 °C is added to a 50.0 g sample of water at 70.0 °C. What is the final…

A: Mass of sample 1 = 10 g Initial temperature of sample 1 = 20.0 °C Mass of sample 2 = 50 g Initial…

Q: states of matter in order of decreasing entropy.

A:

Q: In the following reaction, how much heat is generated when 3.21 moles of CH₄ are burned? CH₄ (g) + 2…

A: Given chemical equation with given information:                      CH₄ (g) + 2O₂ (g) → CO₂ (g) +…