You are watching: For a reaction to be endothermic, which of the following relationships is valid?
Match each collection of conditions with the type of compound when that link is under standard problems at a offered temperature.
Gas → 1 atmAqueous systems → 1 MPure substance → Stable kind at the given temperature and also 1 atm of pressure. (Note: 1 atm is really close come 1 bar, i beg your pardon is the actual standard pressure identified by thermodynamics.)
The typical enthalpy of development of a link is the enthalpy readjust associated with the reaction generates ______ mole (s) of that compound indigenous the component ______ when every one of the substances space under ______ conditions.
By definition, the typical enthalpy of development of a pure ______ in its conventional state is equal to 0 kJ/mol.
element (Note: a pure problem is defined as an facet or a compound. Only the ΔH°f the an aspect in its traditional state is 0 kJ/mol. Thus, substance would not be an enough answer come this question.)
The interior energy adjust for a reaction is regarded enthalpy through equation ΔE = ΔH - PΔV. This equation tells united state that ΔH is very close come ΔE if there is no volume change in the reaction. In i m sorry of the following instances would ΔH give a good approximation of ΔE? pick all that apply.
-A reaction including only solids and also liquids.-A reaction in i m sorry the adjust in the number of moles that gas existing is zero. (Note: The volume adjust for a reaction involving only solids and liquids would be an extremely small.)
Hot coffee is poured into a mug. It gradually cools, releasing warmth to the environment. If we consider the coffee to be the system, i beg your pardon of the complying with are part of the surroundings? pick all that apply.
The total change in the internal energy of a system is the sum of the power transferred as ______ and/or ______.
Use the equation for certain heat capacity to identify the function needed to settle for the variables connected with temperature change. Warm → ______Mass of problem → ______Change in temperature → ______Specific warm capacity → ______
heat→cmasss*ΔTMass that substance→q/c*ΔTChange in temperature→q/mass*cSpecific warm capacity→q/mass*ΔT
If over there is a readjust in heat, Δq, which of the complying with expressions can be used to calculate this? select all the apply.
For a reaction that proceeds with a collection of steps, ΔH(overall)=ΔH(1)+ΔH(2)+ΔH(3) (and for this reason on and so forth.) This is a restatement that ______ law.
Consider the following reactions: A→2B; ΔH = x kJB→C; ΔH = y kJWhat would be the enthalpy change associated with the reaction below? A→2C
x+2y (Note: as soon as the second reaction is multiplied by 2 and included to the an initial reaction, B cancels.)
ΔE=ΔH+2 (at consistent P), ΔH=q (at constant P), ΔE=q+w (under any type of conditions) (Note: internal energy alters include the "extra" energy of work-related (caused by gas expansion, for example).)
Work might be done in a chemical system by a adjust in volume, as a gaseous component expands of contracts, at constant ______.
The change in enthalpy (ΔH) is equal to the change in warm (q) as soon as the mechanism is at continuous ______.
Which the the following transforms in power would it is in assigned a an unfavorable value in a thermochemical equation? select all that apply.
The enthalpy readjust of a reaction measured in ~ the standard state can be stood for by the symbol ______.
The enthalpy change when 1 mol that a compound forms from its aspects in their conventional states can be represented by the price ______.
Which of the adhering to statements properly describe particular heat capacity (c)? choose all the apply.
-The units of certain heat are J/g*K. -The price for details heat is c. -The specific heat for a substance has the same value nevertheless of the size of the sample.
True or false: If an ice cube is inserted on a warm stove, warmth transfers native the ice cube to the stove.
False. (Note: The ice cream cube absorbs heat from the stove; the heat travels native the stove to the ice cube. The ice cube heats up, and the cooktop loses heat.)
The particular heat capacity, abbreviated through the letter ______, is the amount of ______ forced to adjust the temperature of ______ gram of an object by 1 ______.
Which that the complying with statements correctly define exothermic and also endothermic reactions? select all the apply.
-An exothermic reaction is one the releases heat to that surroundings. -If the container that a reaction becomes cooler during the reaction, the reaction is endothermic. -The reaction in one endothermic reaction are lower in power than the products.
Which of the following values are essential to settle for the warm capacity that a heated unknown solid when it is put in a coffee cup calorimeter? choose all that apply.
-The early temperature of the water-The early temperature of the solid-The mass of the solid-The fixed of the water in the cup-The last temperature the the system
ΔH will be equal to ΔE if the total variety of moles that ______ go not change during a chemistry reaction (discounting any small volume readjust caused through liquids or solids).
A ______ role is path independent, an interpretation that just the initial and also ______ conditions are necessary to measure up the net readjust that occurred.
-Enthalpy, H, increases up the y-axis. -In an endothermic reaction, the reactants will be in ~ the bottom of the enthalpy diagram. -The arrow in the enthalpy diagram clues from reaction to products. -The direction the the arrowhead in one enthalpy diagram suggests whether a reaction is exothermic or endothermic. (Note: A downward-pointing arrow indicates the the reaction gives out heat, i.e., that is exothermic.
Which that the following speculative values are offered to resolve for the specific heat capacity of a substance? select all the apply.
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In the enthalpy diagram shown, the reactants are ______ in energy than the products. The reaction therefore ______ heat and is ______.
Chemistry: The main Science14th EditionBruce Edward Bursten, Catherine J. Murphy, H. Eugene Lemay, Matthew E. Stoltzfus, Patrick Woodward, Theodore Brown