A chemical reaction takes place to allow instant cold packs to absorb energy. This is an example of a(n) O physical change O exothermic reaction O endothermic reaction O precipitate

Q: Classify the following as physical or chemical change: When a solution of concentrated HCl(aq) is…

A: For question 3, we have to find the whether the addition of concentrated HCl(aq) to water is a…

Q: а. NH3 NaCN H HCI b. Br EtO2c co,Et `CO2Et Br HCI NO NaOEt H20 c. E1cb OP

A: As per the regulations only the first three subparts of a question could be answered.

Q: A 57.3 g sample metal with a specific heat of 0.421 J/g °C is heated using 1393 J of energy. By what…

A: The amount of heat (Q) absorbed or lost by the body to raise or decline the temperature of the body…

Q: Which statement describes all chemical changes, but not all physical changes? O Bubbles are…

A: The statement which describes chemical changes has to be given,

Q: Is wood burn change? a physical or chemical O Physical O Chemical

A: Burning of wood is physical or chemical change ?

Q: Rank the physical and chemical changes in order of decreasing of the amount of energy released: (a)…

A: If the quantity of water that is condensed in and subsequently precipitated from a cloud is known,…

Q: what state of matter is CH3CO2-? It's an ion, do ions have a physical state?

A: The compound considered is acetate ion, CH3COO-

Q: Which of the following represents an increase in kinetic energy? O A. Cooling steam from 165°C to…

A: When the temperature of an object increases, the average kinetic energy of its particles increases.…

Q: 115. This molecular drawing shows images of acetone mol- ecules before and after a change. Was the…

A: Physical properties are the properties of a compound which can be measured and determine the state…

Q: law of conservation

A:

Q: The warmest temperature ever measured in the United States is134 °F on July 10, 1913, in Death…

A: The given temperature is 134°F.

Q: Which statement is true? Since solids are rigid, their molecules do not possess kinetic energy…

A: The particles of matter are in continuous motion and hence generate kinetic energy by moving…

Q: All moving objects have Kinetic Energy. O True O False

A: we know that Kinetic energy is determined by the equation 0.5•m•v2.

Q: You burn a 0.6 g jellybean to warm 13 g of water, which increases the temperature of the water 2 °C.…

A:

Q: Please explain if the following situation describes a chemical or physical change. Then, nln ploase…

A: A physical change involves only change of physical forms. It doesn't involve any changes in…

Q: How many calories 5000 Joules are?. No computation, no points

A: There are different units of heat-  1- joule 2- calorie

Q: Use the ΔHof data in Table A4.3 to calculate the value of ΔHorxn for the following chemical…

A: The given reaction is:

Q: Convert 3.97×1010 J to units of kcal.

A: By using relation between J and Kcal we can solve this problem. 3.97×1010J = 9.5 × 106 Kcal

Q: 4. How do you distinguish а. physicar pr b. VIStm TסGUIוטווד tralion С. Suruto d. Mixture from a…

A:

Q: How much heat, in Joules, is absorbed by 60 g of water in order to increase in temperature from 23°C…

A: Interpretation: The amount of heat, in joules absorbed by 60 g of water in order to increase in…

Q: A student observed a sample of water in three states of matter. The student should describe the…

A: Three state of matters are solid, liquid and gas. Solids have very strong intermolecular attraction…

Q: 31) H,O, H", heat OH

A: Benzene diazonium salts gives phenol in presence of H2O.H+ Again phenol undergoes coupling reaction…

Q: Note: your answer should be in the form of one or more fractions multiplied together. kJ J -9.0 x…

A: The missing parts in the question can be filled by doing the following conversion,

Q: A student mixed sugar and water during a lab unt the sugar dissolved. This Is an example of a(N) O…

A: The formation of a solution can be either exothermic or endothermic process. If energy is released…

Q: A scientist dropped a glass beaker on the lab floor and shattered it. Which property change does…

A: We know that, when shape of the substance is change then this type of property is known as physical…

Q: 1. (CH3);CCI, AICI, 2. CH;CI, AICI; 3. KMNO4, NaOH, heat 4. H, O+

A: Solution: Friedel Craft alkylation reaction: When alkyl halide treated with aromatic compounds (…

Q: classify whether it is greater than, less than, or equal to.

A:

Q: How many Calories are in 4406 J? Round to two decimal places.

A: The magnitude of a quantity in one unit can be converted to the other unit by addition, subtraction,…

Q: Which change will lead to a larger change in the kinetic energy of an object,doubling its mass or…

A: Ek      =   ½mv2

Q: Energy that is associated with the position or composition of an object is called O thermal energy.…

A: An object can posses many types of energy depending on its chemical behavior, motion, position,…

Q: How much heat, in Joules, is absorbed by 54 g of water in order to increase in temperature from 18°C…

A: Given that:  Mass of water = 54 g Increase in temperature , t =  (55-18 )oC = 37 oC

Q: When a new substance is formed with different properties than the original substance it is called a…

A: Answer:- This question is answered by using the simple concept of chemical change in which new…

Q: You're in a diet that calls for eating no more than 1200 Cal/day. What is this energy in joules?

A: The energy form Calories can be converted into energy form of joules.1200 Calories/day means 1200…

Q: pH = 2.52 Express your answer with the appropriate units. HẢ ? [H3O*] = Value Units

A:

Q: 586 cal to joules.

A:

Q: m Calculate the kinetic energy of a 67. g bullet moving at a speed of 499.

A: Given : mass of bullet = 67. g             speed = 499. m/s  To be calculated :- kinetic energy (J)

Q: convert 531 J to calories

A: Energy can be expressed in different units such as Joules , ergs ,calories , electron volts ,…

Q: O a. mixture of compounds Ob. mixture of elements Oc pure element Od. pure compound QUESTION 27…

A: 26)mixture of compound  A is the answer  27) physical change B is correct answer  28) homogeneous…

Q: 1 Select the correct answer. What changes occur at the molecular level when butter melts in a hot…

A: We have select the correct answer. What changes occurs at the molecular level when butter melts in a…

Q: hite) + 3H2 +49.03kJ C6H6 cation:

A: Mass of carbon = 5.81 g Moles of Carbon = 5.81/12 = 0.484 mol □H = = 49.03 kJ

Q: Change 2 Change 3 Change 1 Change 3 is: Change 1 is: OImpossible a physical change Change 2 is: O…

A: When the reactants react in a reaction and involves the breaking of bonds then this reaction is…

Q: 10. Calorimeter is an instrument used to measure the change in mass of any physical or chemical…

A: The device which is used to measure the amount of heat in a physical or chemical process is known as…

Q: Heat and Phase changes Phase changes Term used for Increase or decrease? Exothermic or phase change…

A: Phase change is defined as when one state of matter changes to another form. The phase change occurs…

Q: Freezing is a exothermic chemical change endothermic chemical change exothermic physical change…

A: Exothermic Reaction  In such reaction heat is produced during the reaction.  Endothermic reaction In…

Q: Give an example of a homogeneous mixture and anexample of a heterogeneous mixture.

A: Mixture : In terms of chemistry, whenever two or more than two atoms/molecules/compounds/substances…

Q: Which change can be easily reversed? O Chemical Change O Physical Change O Both a physical and…

A: A physical change happens when a compound undergoes changes in physical properties like color…

Q: Calculate the final temperatire whem 47 mL of water at 57*C are added to 30 mL of water at 28*C.

A:

Q: CH2 II NH HCI H20 O. H H3C H H3C HO,

A:

Q: NaOEt, ELOH EtO,C CO,Et OEt a) b.) EtO но ÓEt он d)

A: We will choose Correct option

Q: Which of the following is an intensive property? Select one: O a. heat content O b. amount O c…

A: We are having the heat content, amount, volume, mass, and temperature. We have to predict which  one…