magnesium ribbon liquid A 25°C bright light water 60°C liquid B 25°C 7a What event is occuring? 8a. What event is occuring? 9a. What event is occuring? 7b. Circle 8b. Circle 9b. Circle Chemical Change or Physical Change Chemical Change or Physical Change Chemical Change or Physical Change
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- A student dissolves 10.3g of ammonium nitrate NH4NO3 in 300.g of water in a well-insulated open cup. He then observes the temperature of the water fall from 22.0°C to 19.3°C over the course of 3.1 minutes. Use this data, and any information you need from the ALEKS Data resource, to answer the questions below about this reaction: NH4NO3s -> NH+4aq + NO−3aq You can make any reasonable assumptions about the physical properties of the solution. Be sure answers you calculate using measured data are rounded to the correct number of significant digits. Is this reaction exothermic, endothermic, or neither? If you said the reaction was exothermic or endothermic, calculate the amount of heat that was released or absorbed by the reaction in this case. Calculate the reaction enthalpy ΔHrxn per mole of NH4NO3.A sample of solid silver oxide with a mass of 11.4 grams was reduced to elemental silver by heating under a flow of methane gas, CH4. The reaction produced 10.6 grams of silver. Write a balanced chemical reaction for the reaction between silver oxide and methane gas. The only products formed in the reaction are solid silver metal, carbon dioxide gas, and water vapor. Include the phases of each reactant and product.A student dissolves 13.7 g of potassium hydroxide KOH in 200. g of water in a well-insulated open cup. He then observes the temperature of the water rise from 22.0°C to 34.0°C over the course of 7.3 minutes. KOHs + K+aq -> OH−aq You can make any reasonable assumptions about the physical properties of the solution. Be sure answers you calculate using measured data are rounded to the correct number of significant digits. Is this reaction exothermic, endothermic, or neither? If you said the reaction was exothermic or endothermic, calculate the amount of heat that was released or absorbed by the reaction in this case. Calculate the reaction enthalpy ΔHrxn per mole of KOH .
- Which of the following definitions is correct? H = G – TS A = U – TS G = H + PV U = S – PVIndicate for the examples below if the change is physical (P) or chemical (C).31) rocks are ground into gravel ____ 41) a hamburger is grilled ____32) concrete cures to a solid mass ____ 42) molten copper forms a penny ____33) frost forms on a cold window ____ 43) a candle is burned ____34) milk turns sour ____ 44) sugar is dissolved in hot coffee ____35) lightbulb generates light ____ 45) an iron railing rusts ____36) leaves change color in the fall ____ 46) a shaken soda overflows on opening ____37) sunlight yellows white paint ____ 47) compost heap is warm to the touch ____38) a volcano erupts ____ 48) a sunset creates a red-orange sky ____39) heated sugar forms caramel ____ 49) corn mash ferments (for bourbon) ____40) bread dough rises from yeast ____ 50) salt air attacks a bridge’s steel I-beam ___Two positively charged spheres, each with a charge of 2.0 *10-5 C, a mass of 1.0 kg, and separated by a distance of1.0 cm, are held in place on a frictionless track. (a) Whatis the electrostatic potential energy of this system? (b) Ifthe spheres are released, will they move toward or awayfrom each other? (c) What speed will each sphere attainas the distance between the spheres approaches infinity?[Section 5.1]
- James decided to conduct an investigation to find out what would happen with food coloring to water at various temperatures. First he put equal amounts of beakers After looking at his results and data, James claims that the kinetic energy of the substances in the beaker can be changed by transferring energy to the beakers. Is there sufficient evidence to support this claim? (a) No there is not enough evidence to support this claim, because there is no data to suggest that energy has been transferred to the beakers. (b) Yes the data and observable evidence in the gift are sufficient to support his claim (c) No, the evidence is not sufficient, Because energy is invisible so it’s impossible to tell whether the kinetic energy has changed (d) No, the evidence actually suggest that there is no connection between energy transfer and kinetic energy within an objector substanceWhich of the following is an example of a physical property of a substance? The substance reacts violently with water. The substance melts at 73.59 oC. The substance was named after a 3rd century AD African philosopher. The substance is used as a tranquilizer. If a reaction or process is exothermic, Heat or energy is neither going into or out of the reaction or process. Heat or energy is going out of the reaction or process. None of these answers. Heat or energy is going into the reaction or process. Which of the following is a chemical property of a substance? The substance reacts violently with hydrogen, producing a green powder. The substance is a bright orange color. The substance melts at 373.3 degrees Celcius. The density of the substance is 3.375 g/ml. Which of the following is a part of quantum mechanics? The smallest indivisible particles of a substance are atoms. The electrons exist as small bits of negative charge existing in…K2SO4(aq)+BaCl2(aq)⟶KCl(aq)+BaSO4(s) Express your answer as a chemical equation. Identify all of the phases in your answer. Keep the order of compounds as in the original equation. CaCO3(s)⟶CaO(s)+CO2(g) Express your answer as a chemical equation. Identify all of the phases in your answer. Keep the order of compounds as in the original equation.
- is heat conductivity a phyiscal or chemical changeThe summer before coming to school, you are lucky enough to get a job making coffee at Starbucks,but you tell your parents and friends you have secured a lucrative position as a “java engineer”. An eccentricchemistry professor (not mentioning any names) stops in every day and order 250.0 mL of house coffee at precisely95 °C. He then adds enough milk at 10.0 °C to drop the temperature of the coffee to 90.0 °C. Calculate the amount ofmilk (in mL) the professor must add to reach this temperature. (Assume coffee and milk have the same specific heatcapacity: 4.186 J/g °C. Assume that they also have the same density: 1.000 g/mL).Identify the point(s) on the following diagram where the addition of heat will cause the temperature of the sample to increase . Enter your answer in alphabetical order, e.g., DFJ not FDJ. Point(s): fill in the blank 1 Submit Answer