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In a calorimetry experiment, it was determined that a 92.0 gram piece of copper metal released 1860 J of heat to the surrounding water in the calorimeter (qcopper = −1860 J). If the final temperature of the copper metal-water mixture was 25.00°C, what was the initial temperature of the copper metal? The specific heat of copper is 0.377 J/(g°C). Group of answer choices Tinitial = 28.6°C Tinitial = −28.6°C Tinitial = 78.6°C Tinitial = 92.6°C Tinitial = 53.6°C
VSEPR theory predicts that an atom with one lone pair and three bonding pairs (such as the N-atom in aniline) will have a tetrahedral electron geometry and a trigonal pyramidal molecular geometry due to steric repulsions between H-atoms and the N-atom lone pair. However, in question 5 you observed that the N-atom in aniline is not perfectly sp3 hybridized (i.e. the hybridization is different from that predicted for a tetrahedral electron geometry). Briefly describe all of the factors that result in the calculated hybridization of the N-atom lone pair
Which of the following reactions would have the smallest value of K at 298 K? Which of the following reactions would have the smallest value of K at 298 K? A + B → 2 C; E°cell = -0.030 V A + 2 B → C; E°cell = +0.98 V A + B → C; E°cell = +1.22 V A + B → 3 C; E°cell = +0.15 V More information is needed to determine.
A solution of HNO3HNO3 is standardized by reaction with pure sodium carbonate. 2H++Na2CO3⟶2Na++H2O+CO2 2H++Na2CO3⟶2Na++H2O+CO2 A volume of 27.71±0.05 mL27.71±0.05 mL of HNO3HNO3 solution was required for complete reaction with 0.9585±0.0007 g0.9585±0.0007 g of Na2CO3Na2CO3 , (FM 105.988±0.001 g/mol105.988±0.001 g/mol ). Find the molarity of the HNO3HNO3 solution and its absolute uncertainty.
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0.629 moles will be present in moles of atoms are in 9.00 g of 13 carbon atom.
What is a mole?
One mole of any substance is the amount of the substance which contain 6.023 × 10²³ atoms or molecule if the substance is atomic or molecular in nature and known as gram atomic mass.
Number of atoms in carbon is 9.00 grams and isotope are 13C,
Number of moles = weight of substance / mass of substance
Substituting the value in formula,
Number of moles = 9.00 grams / 13
Number of moles = 0.629 moles
Therefore, 0.629 moles will be present in moles of atoms are in 9.00 g of 13 carbon atom.
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Explanation:
Therefore the ratio is 3:3
b. exothermic reaction
c. spontaneous reaction.
d. nonspontaneous reaction.
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Answer:
a. endothermic reaction
Explanation:
In an endothermic reaction, heat is absorbed from the environment. This leaves the surrounding at a colder temperature compared to the system.
ΔH, the change in enthalpy is assigned a positive sign because the heat energy level of the final state is higher than that of the initial state.
Some examples are mostly dissolution substances in water.
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Answer:
they will repel each other
Explanation:
When these two are brought close to one another they will repel each other. This is similar to what happens with magnets, when two objects share the same polarity one object will create a repulsive force upon the second object and push it away. This repellent force is caused by an electric field from the same charged electrons in the atoms of the object. Since in this case both the glass rod and the pinwheel have a negative charge they will repel each other when they come into proximity of one another.
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Answer:
Polyethylene glycol
Explanation:
Because of the corrosive nature of Brine solution (solution of NaCl) , we can use organic liquid polyethylene glycol .
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Answer:
1-pentanol
Explanation:
Hexane is non-polar in nature. This is due to :
The bond in the molecule is C-H, which is non-polar in nature because the carbon and the hydrogen having very similar electronegativity values.
Hexane is also symmetric.
The intermolecular force acting in the molecule of the hexane are induced the dipole-dipole forces or London Dispersion forces / van der Waals forces which is a very weak force.
On the other hand, in the case of 1-pentanol, hydrogen bonding exist which is a strong intermolecular force.
Hence, more amount of thermal energy is required to boil 1-pentanol. hence, it has more boiling point.
Final answer:
The boiling point of 1-Pentanol is higher than hexane because it has stronger intermolecular forces caused by hydrogen bonding. Hexane, on the other hand, has weaker van der Waals forces.
Explanation:
The boiling point of a substance is determined by its intermolecular forces. 1-pentanol has a higher boiling point than hexane because of the presence of hydrogen bonding in 1-pentanol, which is a stronger intermolecular force than the van der Waals forces present in hexane. Hence, more energy is required to break the intermolecular forces in 1-pentanol making its boiling point higher.
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