You add hydrochloric acid slowly to the water and notices that the flask feels hot. What is the system? What is the surrounding? What is the direction of energy transfer? Is it endo or exothermic

Q: B: Define the coordination number and its value for BCC unit cell.

A: Given,  Define the coordination number and its value for BCC unit cell = ?

Q: What are the components of the buffer solution when 0.20 mol H3PO4 is mixed with 0.30 mol of the bas...

A: Given statement is :  What are the components of the buffer solution when 0.20 mole H3PO4 is mixed w...

Q: Find the molarity of 0.13g of calcium hydroxide, Ca OH)2, 33.00 mL solution

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Q: 8 g of potassium chloride is dissolved in a quart of distilled water. Calculate the pH value of the ...

A: Here 8 gram of KOH is dissolved in a quart of distilled water. We have to calculate the pH of soluti...

Q: Prepare 3L    of    a    22%    (v/v)    bleach    solution (calculate    without     rounding).    ...

A: Preparation of 22 % v/v of bleach solution       22% =Volume of bleach solutionTotal volume of solut...

Q: what is the volume of a gas at 750mmHg if it exerted pressure of 650mmHg at 700mL? Assuming that the...

A:

Q: Some chemicals, like hydrogen peroxide, can you prevent photocatalysis? 1. are prone to decompositio...

A: We are authorised to solve only one question at a time. Please post rest of the questions separately...

Q: mole fraction

A:

Q: Draw a D-glucose structure and identify the pyran ring. Also, draw a D-fructose and identify the fur...

A: Concept - Glucose and Fructose are monosaccharides. There are many ways to represent the formula- 1)...

Q: After measuring the cortisol level in 30 students (see problem 1a) it is average cortisol levels mea...

A:

Q: Iculate the percent composition by mass of the following compounds that are important starting mater...

A: We have to determine the mass percent of each element in the given compound. 

Q: (e) Platinum has an FCC crystal structure. The atomic radius of platinum is 0.1387 nm. An X-ray diff...

A: The diffraction of X-rays from crystal surface follow Bragg's equation, nλ=2dsinθn=order of reflecti...

Q: b. Calculate the change in pH when 25 mL of 1.0 M HCl is added to the buffer solution.

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Q: Calculate the pH value of the resulting solution by titrating 0.1 molar ammonium hydroxide 100 ml wi...

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Q: Which one of the following molecular formulas is also an empirical formula? C,H,0, A) C,H,SO В) H,O,...

A:

Q: )0.0100 M in HCl and 0.0320 M in benzoic a ) 0.0100 M in NaOH and 0.075 M in Na,CO )0.0100 M in NaOH...

A: We are given different solutions of mixtures of acids in acids ( part a and b) and mixtures of bases...

Q: B. Determine the following: Pm, P, Pm, Xa, m, and M if 107.125 grams NaOH is dissolved in 480 mL of ...

A: Mass of solute , NaOH = 107.125 g

Q: 1. Silver has two naturally occurring isotopes with the following isotopic masses: 107 107 47 Ar 106...

A: Answer: To solve this question we have to use the relation between average atomic mass and % abundan...

Q: Write the hydrolytic reaction and equilibrium expression, corresponding to the second ionization, Ka...

A: The equilibrium expression for citric acid has been provided.

Q: What is the pH of the solution given the following information? Methyl orange = yellow Methyl red = ...

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Q: Higher Rf value will be obtained from dextrin than that of glucose in a reverse-phase TLC. O True O ...

A: Rf means Retardation factor.  Rf value means the ratio of distance travelled by solute to the distan...

Q: molecular formula

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Q: compound C?

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Q: One of relatively few reactions that takes place directly between two sollds at room temperature is ...

A: For a balanced reaction number of atoms of each element must be equal on both sides.   Given :  Mass...

Q: thermometer A 58.8 g sample of quartz, which has a specific heat capacity of 0.730 J•g '.°C', is put...

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Q: Which is the stronger acid? A OR B? SEE THE PICTURE BELOW

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Q: What are the components of the buffer solution when 0.20 mol H3PO4 is mixed with 0.30 mol of the bas...

A:

Q: clearly explain what type of isomerism is being shown and how it arises. i) Br2C=CH2 ii) CH3CH2CH2...

A: positional isomerism, it is also called position isomerism - isomers have the same functional groups...

Q: Enter the coefficients directly from the balanced chemical equation. Do not reduce to lowest terms. ...

A:

Q: НОАС propanol (excess)

A: This reaction  is protection  of carbonyl  group  of ketone functional group.  The final product  is...

Q: The OH concentration in an aqueous solution at 25 °C is 7.9 x 10-3. What is [H]?

A: pH of a solution measures acidity or basicity of solution. pH less than 7 indicates solution is acid...

Q: Complete the balanced neutralization equation for the reaction below: HNO:(aq) + Ba(OH):(aq)

A: Neutralization reaction is the reaction between acid and base to form salt and water. And balance re...

Q: 1. Write the equilibrium expression and identify the specific equilibrium constant symbol possible, ...

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Q: Giorno Giovanna measured the mass of a product in order to calculate the amount of analyte present i...

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Q: The Henderson-Hasselbalch equation is formulated based on the ionization of a weak acid O True O Fal...

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Q: Unknown containing C,H,N,O with MW of 87. P A Nujol mull of a compound with a molecular weight of 87...

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Q: 11 Give the missing reactant(s), product(s) or reagent(s) ONLY (no mechanisms). (Non-anonymous quest...

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Q: EXERCISE NO.1 In each of the following solutions, identify the solute and solvent and their classifi...

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Q: Choose one disaccharide and explain its structure, properties and function. ()

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Q: what is the lewis structure of POF3, its geometry, intramolecular forces and covalence

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Q: Write the mass balance and charge balance equation of 0.20 HNO2. Note that HNO2 is a weak acid

A: Solution                                Given that  Equation of = 0.20 HNO2 Weak acid is = HNO2 Fin...

Q: If a 5.6 L solution has a pH of 3.6, what will the pH be if the volume is increased to 7.2 L?

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Q: Fill up and identify the missing :

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Q: Flammable liquids burn only when their vapor is mixed with air in the appropriate concentration. Whe...

A: We have to tell which option is correct from given choices of options by telling what must to be don...

Q: Direction: Relate the properties of liquids to intermolecular forces. Tell whether each property exh...

A: The solutions are as follows

Q: Salicylic acid reacts with acetic anhydride to form aspirin, acetylsalicylic acid.  If the percent y...

A: Given, Salicylic acid reacts with acetic anhydride to form aspirin Percent yield of the reaction = 7...

Q: 23A 0.20 g sample of primary standard Na2C204 (134 g/mol) needed 37.22 mL of of KMNO4 solution to re...

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Q: Find melting points of the materials: Aluminum                                                      ...

A:

Q: 4.46 How would you prepare cis-but-2-ene starting from propyne, an alkyl halide, and any other reage...

A: 4.46) We have to prepare cis-but-2-ene from propyne and alkyl halide. Expansion: Here in the first s...

Q: An aqueous solution of gold nitrate is electrolyzed with a current of 0.5 ampere until 1.5 g of gold...

A: Given data,Mass of Au=1.5gCurrent=0.5 ampereAtomic weight of Au=197g/mol

Thermochemistry

Thermochemistry can be considered as a branch of thermodynamics that deals with the connections between warmth, work, and various types of energy, formed because of different synthetic and actual cycles. Thermochemistry describes the energy changes that occur as a result of reactions or chemical changes in a substance.    

Exergonic Reaction

The term exergonic is derived from the Greek word in which ‘ergon’ means work and exergonic means ‘work outside’. Exergonic reactions releases work energy. Exergonic reactions are different from exothermic reactions, the one that releases only heat energy during the course of the reaction. So, exothermic reaction is one type of exergonic reaction. Exergonic reaction releases work energy in different forms like heat, light or sound. For example, a glow stick releases light making that an exergonic reaction and not an exothermic reaction since no heat is released. Even endothermic reactions at very high temperature are exergonic.