You are watching: Which statement about enthalpy is true?
Two metal blocks that have slightly different temperatures are placed next to one another. After five minutes, castle both have actually lower yet equal temperatures. According to the regulation of conservation of energy, what most most likely happened?Energy was developed inside the blocks.Energy was damaged inside the blocks.Energy was soaked up into the blocks from exterior the system.Energy was transferred from the warmer block to the cooler block.
A welding torch to produce a fire by burning acetylene fuel in the existence of oxygen. This flame is used to melt a metal. Which energy revolution represents this process?chemical power into heat energypotential power into kinetic energykinetic power into electromagnetic energypotential energy into chemistry energy
What defines the vital difference in between a bomb calorimeter and also a coffee cup calorimeter?A bomb calorimeter is 10 times larger yet works the very same way.A bomb calorimeter measures heat for liquid commodities only.A bomb calorimeter has actually a different chamber to host substances and can also measure heat get or loss because that reactions that execute not take place in water.A bomb calorimeter deserve to measure heat get or ns in gas reactions but is not beneficial for reactions that happen at high pressures and also temperatures.
How should the baking of a pizza be categorized?as one exothermic procedure because the dough release heatas an endothermic procedure because the dough release heatas one exothermic procedure because the dough absorbs heatas an endothermic procedure because the dough absorbs heat
Which statement specifies calorimetry?the preservation of energya unit of energy that is supplied when calculating energy exchangea an equipment that is used to measure the warm that is obtained or lost throughout a chemical changethe measure of power that is offered off or absorbed in a physical or chemical process
Which statement around enthalpy is true?The enthalpy of formation for a pure element in its traditional state is constantly positive.The enthalpy of formation for a pure facet in its standard state is always negative.Enthalpy is a state role because its readjust depends only on initial and final conditions.Enthalpy is no a state role because its adjust depends top top the identities of the reactants and also products.
Which reaction is endothermic?HCl + NaOH NaCl + H2O + 58 kJ6CO2 + 12H2O + energy C6H12O6 + 6O2 + 6H2O2Na + Cl2 2NaCl + energy2C2H6 + 7O2 4CO2 + 6H2O + 2,502 kJ
Which is the best example of how electromagnetic power is offered in daily life?a pot of cook water on a gas stovea patient receiving an X-ray in a hospitala car burning petrol to power the enginea vehicle of a roller coaster moving conveniently down a slope
Which direction go thermal energy flow in the following diagram?Heat flows from the ice cream to the hand.Heat operation from the hand come the ice cream.The device is in a state of equilibrium.The system is too cold for heat to move.
Nitrogen dioxide, NO2(g) (Hf = 33.84 kJ/mol), is decomposed according to the adhering to reaction:What is the enthalpy adjust when 2.50 mol of nitrogen dioxide decomposes?13.5 kJ of power released13.5 kJ of energy absorbed84.6 kJ of energy released84.6 kJ of energy absorbed
Which statement finest describes the direction of heat circulation by conduction in between two samples that the same material?Heat flows from quicker molecules to slower molecules when they are near.Heat flows from quicker molecules to slower molecules as soon as they collide.Heat operation from slower molecules to much faster molecules as soon as they are near.Heat operation from slow molecules to faster molecules as soon as they collide.
A metal sample is heated and placed right into the water in a calorimeter at room temperature. I m sorry statement finest describes just how the calorimeter have the right to be provided to identify the certain heat capacity of the steel sample?Energy move to the steel from the water and also calorimeter till they space all at room temperature.Energy move from the steel to the water and calorimeter till they room all in ~ room temperature.Energy transfers to the metal from the water and calorimeter till they every reach a single temperature.Energy move from the metal to the water and calorimeter until they all reach a single temperature.
Complete burning of a 0.350 g sample that a compound in a bomb calorimeter publication 14.0 kJ the heat. The bomb calorimeter has a massive of 1.20 kg and also a details heat the 3.55 J/(gi°C).If the initial temperature that the calorimeter is 22.5°C, what is its last temperature?Use .19.2°C25.3°C34.2°C72.3°C
Which best describes heat?energy the is brought by electric and magnetic fieldsenergy the decreases together a auto slows come a stopenergy that increases as a book is lifted to a greater shelfenergy that flows indigenous a warm mug the tea to a cold hand
Ammonia, NH3 (Hf = -46.2 kJ), reacts v oxygen to produce water (Hf = -241.8 kJ) and nitric oxide, NO (Hf = 91.3 kJ), in the adhering to reaction:What is the enthalpy change for this reaction? Use-900.8 kJ-104.6 kJ104.6 kJ900.8 kJ
Manganese dioxide (MnO2(s), Hf = -520.0 kJ) reacts v aluminum to type aluminum oxide (AI2O3(s), Hf = -1699.8 kJ/mol) and manganese follow to the equation below.What is the enthalpy that the reaction?-1,839.6 kJ-1,179.8 kJ1,179.8 kJ1,839.6 kJ
A generator has a coil the spins to create an electric current. How is power transformed by utilizing a generator?Thermal energy is transformed to potential energy.Thermal power is changed to mechanically energy.Chemical power is reinvented to electromagnetic energy.Mechanical energy is reinvented to electromagnetic energy.
An ice cream cube is inserted on a kitchen counter. Which ideal describes heat flow in this situation?Heat flows from the ice to the counter, bring about the molecule in the respond to to move more quickly.Heat flows from the ice to the counter, leading to the molecules in the respond to to move more slowly.Heat flows from the respond to to the ice, bring about the molecules in the counter to move an ext quickly.Heat flows from the counter to the ice, leading to the molecules in the respond to to move much more slowly.
Which declare is true if the Hrxn that a reaction is positive?The reaction is endothermic.The reaction is exothermic.There is more reactant 보다 product.There is more product 보다 reactant.
The particular heat that water is 4.18 J/(gi°C) and also that of timber is 1.97 J/(gi°C). I beg your pardon statement is correct?Regardless the mass, wood will heat up much less than water if the same warm is added.Given same masses, lumber will warmth up much less than water if the same heat is added.Given same masses, water will warm up less than hardwood if the same heat is added.Regardless the mass, water will heat up less than hardwood if the same heat is added.
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Which reaction is endothermic?2BrCl Br2 + Cl2 + 29.3 kJ2H2 + O2 2H2O + 572 kJC + O2 CO2 + 394 kJN2O4 + 59 kJ 2NO2
Based top top the equation and the information in the table, what is the enthalpy the the reaction? usage -453.46 kJ-226.73 kJ226.73 kJ453.46 kJ
A college student touches a freshly baked cake that was taken out of the oven. Which best explains why the cake feels hot?Molecules in the skin room moving quicker than molecule in the cake.Molecules in the cake space moving faster than molecules in the skin.The kinetic energy of molecule in the cake is much more than the energy in the baking tray.The kinetic energy of molecule in the baking tray is more than the power in the cake.
Complete burning of a 0.600-g sample of a link in a bomb calorimeter publication 24.0 kJ that heat. The bomb calorimeter has a mass of 1.30 kg and a certain heat of 3.41 J/(gi°C). If the early stage temperature that the calorimeter is 25.5°C, what is its final temperature?Use 30.9°C34.5°C44.0°C51.5°C