Enthalpy and Chemical Reactions 120 DQs 1

A calorimeter is pictured below. When substances are dissolved in water, they can absorb or release heat. Describe how you would use a calorimeter to determine the amount of heat required or released to when 10 grams of sugar is dissolved in 100 grams of water. Describe how you would calculate the heat absorbed or released by the sugar with the data you collect. (Do no perform any calculations.) * thermometer stirrer insulated cover styrofoam cups

A scientist wants to perform a reaction in a vacuum chamber to control the experiment as much as possible and to prevent other variables from impacting the reaction. The scientist is trying to determine if the reaction is endothermic or exothermic and measure how much energy is absorbed or given off. Is this a smart approach? Why or why not? In three to five sentences, explain your reasoning.

Can you help me answer this type of question from my study review package please

Please refer to the attached photo. Thank youuu

Pre-Laboratory Assignment 1. Sam performed a reaction in lab where he mixed a dilute solution of hydrochloric acid into a dilute solution of sodium hydroxide. The temperature of the mixed solution rose immediately from 20.0°C to 30.0 °C. Was the reaction Sam performed in the lab exothermic or endothermic? What evidence (observation) for this reaction supports your inference? 2. Define Hess's Law. 3. Predict the target reaction which can be obtained by adding step 1 and 2 shown below. Also calculate the heat of reaction of the target reaction, which can be obtained by AH" from step 1 and 2. Step 1 2 Hy(g) + N>(g) N,H,(g) AH = 95.4 Step 2 NgH,(g) + Ha(g) 2 NH3(g) AH" =-187.6 kJ kJ 81

I Review | Constants | Periodic Table Open the activity depicting Hess's Law. Part B N: (g) + 0: (g) 2NOg) AH is an Extensive Property + N: ) +0:() → NO(g) AH Changes sign when a Click on the process is reversed screen when you started and its derivative demonstrate that the reaction enthalpy, AH, changes sign when a process is reversed. button within the activity and analyze the relationship between the two reactions that are displayed. The reaction that was on the AH Canges sign when a process is reversed 2NO(g) → N:(gì + 0: (g) Consider the reaction Hess Law of Constant icat Sumnation + N: (g) +0: (g) – d NQ +0:() B's) + 302(g)—B>0ҙ(s), дн — -1270KJ When two reactions are added together. the individual reaction enthalpies are summed. Notice that equal quantities of the same species, on both sides of the reaction arrow, cancel. → NO: g What will AH be for the reaction if it is reversed? + N: (g) + O: (g → NO: (g) Express your answer with appropriate units. • View Available Hint(s) µA…

Part A incorrect you filled in 4 of 5 blanks incorrectly

Goofy Incorporated bought a sizeable amount of Crazy Company's bonds for $200,000 on May 5, 2023, and classified the investment as available-for-sale. The market value of the bonds declined to $124,000 by December 31, 2023. Goofy reclassified this investment as trading securities in December of 2024 when the market value had risen to $163,000. What effect on 2024 net income should be reported by Goofy for the Crazy Company bonds? A: 39,000 net unrealized holding gain B: 37,000 net unrealized holding loss C: 76,000 net unrealized holding loss D: 0

A scientist wants to perform a reaction in a vacuum chamber to control the experiment as much as possible and to prevent other variables from impacting the reaction. The scientist is trying to determine if the reaction is endothermic or exothermic and measure how much energy is absorbed or given off. Is this a sound approach? Why or why not? In three to five sentences, explain your reasoning.

Identify which of the two experiments is an endothermic and exothermic reaction. Explain how each reaction should be define.

Posttest Direction. Read the questions carefully. Write the letter of the correct answer. 1. Water exists in three states of matter and continuously moving through a cycle on Earth. At which stage in the water cycle does water transform from a gas to a liquid? a.evaporation c. precipitation b. condensation d. Sublimation 2. Carbon dioxide (CO2) forms when coal burns in the presence of oxygen. Which of the following is the BEST evidence that a chemical reaction occurs when the coal burns? a. Production of mechanical energy c. A new substance is produced b. Production of electricity d. Formation of precipitate 3.Which of these does NOT happen during a chemical change? a. New substances are formed with different chemical properties. b. Attractive force between atoms of molecule formed or break. c. The chemical properties of the substances before and after the reaction are the same d. Energy is always released or absorbed. 4. A granular substance is added to a liquid. Which of the…

Based off information from the attachment, please help with #13 on second attachment

Could someone please help! No plagiarism Please! 3. Draw an or find an image of an endothermic reaction or an exothermic reaction. Explain what makes it the type of reaction you chose to illustrate. Include arrows to show what direction the overall enthalpy of reaction (energy of reaction) flows.    4.  Ammonium nitrate dissolves in water via the following reaction: NH4NO3(s) → NH4+(aq) + NO3-(aq) The bond energies of the compounds in the reaction are as follows: NH4NO3 =   3040 kJ/mol NH4+ = 1564 kJ/mol NO3- = 1009 kJ/mol How much total energy does the reaction have, and how will the environment change when the reaction occurs? Please show all of your work

You work in a research organization that is looking for markers of various diseases that can be used as a diagnostic for the disease. It has been reported in the past that high levels of Cu are found in the sweat of people with cystic fibrosis. One of the research projects is focused on looking for high levels of Cu in samples that can be obtained non-invasively such as saliva, sweat, hair, nails, etc. The lab will analyze large samples for Cu. What instrument would you recommend purchasing to support this work, Atomic absorption spectrophotometer or an inductively coupled plasma atomic spectrophotometer? Explain the basis for your decision.

Dr. Wong's assistant made the observations below while heating a sample of solid hydrogen. Using the data and observations in the table below, create a heating curve for hydrogen that Dr. Wong can reference during his laboratory testing. Be sure to include and label the following items in your heating curve: Create temperature and time intervals that are appropriate for the data. Don't start the temperature on the graph at 0 °C because the time intervals will be too large for the hydrogen data. Label the melting and boiling points on the curve. Label the three states and the two transition phases on the curve.   Heating data: Time (Minutes) Observations 0:00 Hydrogen is a solid at −263 °C. Heat is added to sample. 2:43 Hydrogen begins to change into a liquid at −259 °C. 6:15 Temperature of the liquid begins to increase. 10:36 Hydrogen begins to form a gas at −253 °C. 14:01 Temperature of the gas begins to increase. 18:00 Final temperature of hydrogen gas is −245 °C.…

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Dr. Wong's assistant made the observations below while heating a sample of solid hydrogen. Using the data and observations in the table below, create a heating curve for hydrogen that Dr. Wong can reference during his laboratory testing. Be sure to include and label the following items in your heating curve: Create temperature and time intervals that are appropriate for the data. Don't start the temperature on the graph at 0 °C because the time intervals will be too large for the hydrogen data. Label the melting and boiling points on the curve. Label the three states and the two transition phases on the curve.   Heating data: Time (Minutes) Observations 0:00 Hydrogen is a solid at −263 °C. Heat is added to sample. 2:43 Hydrogen begins to change into a liquid at −259 °C. 6:15 Temperature of the liquid begins to increase. 10:36 Hydrogen begins to form a gas at −253 °C. 14:01 Temperature of the gas begins to increase. 18:00 Final temperature of hydrogen gas is −245 °C.