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  • What constitutes this reaction? Pb(NO3)2 + 2 KI ---> PbI2 + 2 KNO3.
    What constitutes this reaction? Pb(NO3)2 + 2 KI ---> PbI2 + 2 KNO3.
    Pb(NO3)2 + 2 KI ---> PbI2 + 2 KNO3what constitutes this reaction ?

  • What type of reaction is this? C +  H2O à CO + H2 Hrxn = + 113 kJ  
    What type of reaction is this? C +  H2O à CO + H2 Hrxn = + 113 kJ  
    Why is it exothermic it has a positive energy energy is getting absorbed so therefore shouldn't the energy level increase?

  • What is an example of a true solution?
    What is an example of a true solution?
    In science, a true solution deals with the type of mixture and how it is dissolved. Also, it also has to comply with the measurements of the particle size. Specifically, a true solution’s particles can’t be larger than one nanometer. It also must be a homogeneous mixture. This means that at least two substances are mixed together and their particles are spread evenly or uniformly throughout the mixture. The opposite of that is called heterogeneous and this means that the particles are not spread evenly throughout the mixture. There are many examples of a true solution, but probably the most common is a sugar and water solution. When mixed thoroughly, the sugar dissolves into the water. If you drank it, the water would consistently taste sweet due to the sugar.

  • Which of the following would be the best molecular level representation after the reaction has taken place?
    Which of the following would be the best molecular level representation after the reaction has taken place?
    There are no actual answers here - just A, B, C, and D, where answer A reads “A”, answer B reads “B”, and so on. There are no diagrams, no descriptions. This makes it impossible to say for certain what the actual answer should be. However, this shouldn’t be that hard for someone who is good at chemistry to figure out. Since I am not that particularly good at chemistry, I will not attempt to answer this question without a sufficient answer on the list. I would implore the first answerer to expand on how they know it is answer “D” without anything else on the answer list, not only for my benefit, but for the benefit of those who come to this question after me.

  • What is the concentration of the H2SO4(aq)? Information related to a titration experiment is given in the balanced equation and table below. H2SO4(aq) + 2KOH(aq) → K2SO4(aq) + 2H2O(l)  Based on...
    What is the concentration of the H2SO4(aq)? Information related to a titration experiment is given in the balanced equation and table below. H2SO4(aq) + 2KOH(aq) → K2SO4(aq) + 2H2O(l)  Based on...
    The correct answer to this question is D, 0.96 M. The given equation and chart can help us solve this question. Along with using the equation and table, it is helpful for the person answering the question to know the meaning of the terms in the question. The term concentration is the amount of a substance that is in space. The term Volume is how much liquid, solid, or gas occupies a space. This type of question would be found on a chemistry test. Due to its difficulty, it could also be found on an IQ test to test one's intellect.

  • What is adding water to break down a polymer/substance into a monomer called?
    What is adding water to break down a polymer/substance into a monomer called?
    The correct answer to this question is B, hydrolysis. This is defined as a chemical breakdow of a compound, formed from a reaction with water. The word hydrolysis comes from Ancient Greek, where hydro means water and lysis means to unbind. During this process, water molecules are seperated into hydrogen and oxygen atoms. This is done by using electricity. There are many different types of hydrolysis'. One includes salt. It occurs when a salt of either a weak acid or base dissolves into water. There is also hydrolyses of amides, which happens when the nucelophile attacks a carbon of the amide.

  • What is the the second reaction known as during the formation of an 'indolyne' which is a dienophile related to benzyne?. Step 1: It is believed that a [2.2.-bicyclic intermediate forms...
    What is the the second reaction known as during the formation of an 'indolyne' which is a dienophile related to benzyne?. Step 1: It is believed that a [2.2.-bicyclic intermediate forms...
    The Retro-Diels-Alder Reaction. The Retro-Diels–Alder reaction (RDA) is the second microscopic reversed reaction of the Diels–Alder reaction—the formation of a diene and dienophile from a cyclohexene. It can spontaneously be accomplished with heat, or acid or base mediation. With the right and the appropriate driving force, the Diels–Alder reaction proceeds in reverse, providing diene and dienophile from starting cyclohexene derivatives. This process was known and applied to the detection of cyclohexadienes as early as the year 1929. After reacting with acetylenes through a Diels–Alder/retro-Diels–Alder sequence, it released ethylene and aromatic compounds.

  • What is fermentation?
    What is fermentation?
    A process where a sugar is broken down into ethanol and carbon dioxide

  • What property stays the same during physical and chemical changes?
    What property stays the same during physical and chemical changes?
    Option C - mass Mass doesn't change in physical or chemical change. Physical change are changes that affect the form of a substance. Example is the change in the state of water from solid to liquid and to ice. Chemical change is a type of change that occurs when a substance is changed from one form to another form that cannot be reversed. Chemical composition changes in chemical change. Density and shape change in physical change, shape and arrangement of particles change in chemical change. Remember the law of conversation of mass, that states that mass is neither created nor destroyed in physical or chemical change.

  • What are properties that do depend on the amount of matter present called?
    What are properties that do depend on the amount of matter present called?
    Intensive property is defined as independent on the amount, which means it doesnt depend on the amount. For example, density, boiling point, freezing point and melting point

  • What it must be a if a reaction finishes with more energy than it started?
    What it must be a if a reaction finishes with more energy than it started?
    I believe it is Endothermic

  • What 98% H2SO4 dosage is required? The make-up water for a cooling water system is 100 gpm and contains 150 ppm of M-Alkalinity. You want to run the system at 5 cycles while maintaining 400...
    What 98% H2SO4 dosage is required? The make-up water for a cooling water system is 100 gpm and contains 150 ppm of M-Alkalinity. You want to run the system at 5 cycles while maintaining 400...
    Acid, lb/d = (mg/L alkalinity reduction as CaCO3)(BD, gpm)(8.34 lb/gal)(1440 min/d)/(1000000 mg/L) = 3508.341440/10^6 = 84 pounds per day.

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