A match is lit and held under a cold piece of metal. The followingobservations are made: (a) The match burns. (b) The metal getswarmer. (c) Water condenses on the metal. (d) Soot (carbon) isdeposited on the metal. Which of these occurrences are due tophysical changes, and which are due to chemical changes?

Q: An increase in water temperature is observed when 1.97 g of NaOH is added. The enthalpy change for…

A: Mass of NaOH = 1.97 g  Enthalpy change for reaction (dH°) = -2.19KJ dH° is negative . Molar mass of…

Q: how much energy (in kcal) is required to convert 122.2 g of benzene (c6h6) from a liquid to a gas,…

A:

Q: The salt magnesium chloride is soluble in water. When 0.530 g of MgCl, is dissolved in 106.00 g of…

A:

Q: If 27.5 g of MgCl₂ are dissolved 500.0 g of water at 20.0 °C in an insulated container, a…

A: Given that, The mass of the MgCl2 is 27.5 g. The mass of the water is 500.0 g. So, the total mass of…

Q: The lattice energy of CsF is -744 kJ/mol, whereas that of BaO is -3029 kJ/mol. Explain this large…

A: Given information: Lattice energy of CsF = -744 kJ/mol Lattice energy of BaO = -3029 kJ/mol

Q: At 18°C the heat of solution of anhydrous CuSO4 in a large volume of water is -15,800 cal/mole,…

A: At 18 °C the heat of solution of anhydrous CuSO4 is -15,800 cal/mole while that of CuSO4 . 5 H2Ois…

Q: (a) Which of the following cannot leave or enter a closed system:heat, work, or matter? (b) Which…

A: (a) A closed system is a type of system in which energy can be exchanged in the form of heat or work…

Q: Calculate equilibrium temperature.

A:

Q: Two positively charged spheres, each with a charge of 2.0 *10-5 C, a mass of 1.0 kg, and separated…

A: Electrostatic potential is a result of Coulomb forces and it is a potential energy which is related…

Q: D 1. a. s b. C. रे X Но OH N Cro3 Hs04 SOCI 1. MCPBA 2. CH3 CH₂ Mg Br THF 3. Hcl Workup PCC CH₂2

A: CrO3 , H2SO4 is used as an oxidising reagent. It oxidized primary alcohol to carboxylic acid.  In…

Q: Chemist provided evidence that was used to support a ban on the use of chlorodifluoromethane as a…

A: A question based on environmental pollution that is to be accomplished.

Q: If an athlete expends 2241 kJ/h, how long does she have to play to work off 1.00 lb of body fat?…

A: The solution is given below -

Q: ne signof the ermthalpy Change ( 1) 2. A student performs a reaction and determines the enthalpy…

A: Here the enthalpy change is positive.

Q: NaOH, ethanol heat

A: Organic reactions are those in which organic reactant react to form organic products.

Q: 150.0 ml. of 0.200 mol/L. HBr is added to 150.0 ml. of 0.200 mol/L. KOH. Ihe temperature of the…

A: 1- calculate the millimoles  apply specific heat capacity  , calculate the difference the…

Q: Sodium Chloride has a latice energy of -787 kJ/mol and a heat of hydraion of -774kJ/mol. How much…

A: Enthalpy of given solution can be determined using the equation given below:

Q: Identify the force present and explain whether work is donewhen (a) a positively charged particle…

A: (a) Work is said to be done if an object is moved against a force. When a positively charged…

Q: Enter your answer in the provided box. If 0.10 mol of ammonium chloride (NH,C) is dissolved in a…

A: Given that, the amount of heat is Q = -6.9×102 cal. The mass of the solution is m = 1.39×102 g, The…

Q: The World Health Organization (WHO) recommends us to limit "free sugar" intake to no more than 5 %…

A: Given, Total calories intake of an individual in a day = 2000 calories Total free sugar intake as…

Q: kJ are required to melt a 27.2 g sample of solid chromium, Cr, at its normal melting point.

A: When the substance changes solid its state from solid state to liquid state is known as enthalpy of…

Q: A hot cup of tea placed near an open window to cool. Which of the following statements best…

A: Given: Hot cup of tea placed near an open window to cool.

Q: By placing a bottle of hydrochloric acid next to another of ammonia and removing the corks from…

A: Note: ammonia donates its lone pair to proton forms ammonium ion. Therefore it is called…

Q: A student determines the heat of dissolution of solid ammonium chloride using a coffee-cup…

A:

Q: In a coffee-cup calorimeter, 24.5 g sample of solid KCIO, is dissolved in 200.0 g of water at 15.0…

A: mass of KClO3 = 24.5 g molar mass of KClO3 = 122.55 g/mol specific heat = 4.184 J/g-°C Change in…

Q: Give the chemical name of the final product that will be formed by the following reaction: NaCN HA…

A: The reaction given is,

Q: A scientist dissolves an ionic compond into 370 g of water that i originaly at 35 C. The dissolution…

A: Heat capacity: The amount of heat required to increase the temperature of one gram of a substance by…

Q: What is a single molecule called?

A: A single molecule experiment is an experiment that investigates the properties of individual…

Q: Define the term heat of fusion?

A: In thermodynamics, whenever, there is a change in state of matter takes place, heat is exchanged…

Q: Calculate the change in temperatue in  °C when 5.5 grams water absorbs 110 calories.  The For water…

A:

Q: 1. 1 N NAOH .N. 2. aq. HCl (workup) H3C `CO2Et

A:

Q: The following information is given for ethanol at 1 atm: Boiling point = 78.40°C Heat of…

A:

Q: Imagine a container placed in a tub of water, as depicted inthe accompanying diagram. (a) If the…

A: a) Heat generally flows from high temperature to low temperature. here temperature of the system is…

Q: . A 25.00 gram sample of barium chloride was dissolved in 75.00 grams of water. If the calorimeter…

A: The question is based on the concept of chemical thermodynamics. we have to calculate heat produced…

Q: What force(s) is(are) responsible for the higher heat of vaporization of acetone compared to…

A: Heat of vaporization is how much energy is needed to separate the bonds in a molecule.

Q: Calculate the gross and net calorific value of the coal, assuming the latent heat of condensation of…

A: Gross and Net calorific value determination by calorimeter LCV (NCV) = GCV - (0.09 H * Lv)…

Q: At 100 ° C, 1 mol of liquid water takes 19400 calories and under one atmosphere pressure, the same…

A: Change in internal energy is zero if temperature is constant because, internal energy is a function…

Q: With this information and the specific heat of water, 4.184 J/(g•°C), calculate the specific heat,…

A:

Q: A dilute solution of hydrochloric acid with a mass of 606.46 g and containing 0.37376 mol of HCl was…

A:

Q: substance that could not be chemically divided into a simplier substance is called an?

A: Given that, A substance that could not be chemically divided into a simplier substance is called an…

Q: 4. If the heat of formation of carbon dioxide is -393 kJ/mol, then the heat of reaction for the…

A: Heat of the formation is the amount of heat realesed when 1 mol of a substance is formed from it's…

Q: Chemistry (c) Benzene (E) is converted to product F by the two-step process detailed below. Draw…

A: In Friedel-Crafts Acylation, Lewis acid and the chlorine atom of the acid chloride create a complex.…

Q: Explain the concept of specific heat and how the specific heat of water enables the human body to…

A:

Q: 4. How did carbon move through the system before combustion of fossil fuels?

A: As you have asked multiple questions, we have answered your 1st question. If you want the answer to…

Q: What is ΔSsurr (in J/K) if ΔHsys is -27.2 kJ and T is 379 K?

A: • The values provided in the question are:-    i) Enthalpy change for the system of a spontaneous…

Q: Question 3

A: Given,Mass of barium chloride = 25gMass of water = 75gCalorimeter constant = 120J/degree Celsius.

Q: Is entropy increased or decreased in boiling water?

A: Boiling of water is a process in which the liquid water molecules is given more energy to convert…

Q: 2. In the determination of water of crystallization for the hydrated salt BaCl2.2H20, the following…

A: Here we are required to find the experimental percent of water

Q: A negative qrxn means? Select one: a. that heat was required by the reaction b. that heat was given…

A: Negative  qreaction means