Two yellow substances are mixed in a flask. The flask then feels warm. This is an example of what kind of reaction? O isothermic exothermic endothermic combustion

Q: Which statement is true of energy in reactants during an endothermic reaction? The energy found in…

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Q: The combustion of octane is an exothermic reaction. Which statement is true for an exothermic…

A: The true statement for exothermic reaction is

Q: The specific heat of an unknown metal is calculated to be 3.74 J/g °C. What is the mass of the…

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Q: 4.by touching the side of a beaker a student concludes that an exothermic change is taking place…

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Q: A chemist measures the energy change AH during the following reaction: Cl,(9)+H,(9) → 2 HCl(g)…

A: A chemical reaction in which heat releases is known as exothermic reaction  A chemical reaction in…

Q: A 8.17 g sample of an unknown salt (MM = 116.82 g/mol) is dissolved in 150.00 g water in a coffee…

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Q: A chemical reaction occurs and 64.7 cal is transferred to the system. How many joules is this? is…

A: We have to predict nature of reaction and heat in joules.

Q: Which of the following is an example of an endothermic process? The combustion of methane, CH4,…

A: Chemical reactions take place by absorbing or releasing heat energy. The processes in which heat…

Q: Decide whether each of these reactions is exothermic or endothermic. 1. When two chemicals mix their…

A: An exothermic reaction is one that is associated with the evolution of energy (usually in form of…

Q: When 1 mole of CH4(g) reacts with H2O(g) to form H2(g) and CO(g) according to the following…

A: Since,  1 mole of CH4(g) reacts with H2O(g) to form H2(g) and CO(g) 206 kJ of energy are absorbed.…

Q: Choose the endothermic process  butter turning rancid, photosynthesis of carbohydrates by plants,…

A: Endothermic processes are those in which heat is absorbed in the reaction whereas in exothermic…

Q: Convert between energy units.a. 231 cal to kJ b. 132 * 104 kJ to kcalc. 4.99 * 103 kJ to kWh d. 2.88…

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Q: Is the following reaction exothermic or endothermic? Choose the correct answer and reasoning. 2 SO3…

A: Ans b ,endothermic  ,because energy was added to the reaction as a reactant . In endothemic…

Q: The reaction for the combustion of propane is kcal (DOʻHT + (8) 0E – (3)OS + (3)*H°Ɔ mol AH = -526.3…

A: Given, C3H8 (g) + 5O2 (g) → 3CO2 (g) + 4H2O (l) ∆H = - 526.3 kcal/mol Note: negative sign (-)…

Q: 8. When the heat in a system is released to its surroundings, this type of reaction is known as: O…

A: Heat is either released or absorbed during a reaction depending upon the energy of reactant and…

Q: Surrounding Reaction A Reaction B Temperature Initial Temp 25.1°C 25.1°C Final Temp 30.2°C 20.0°C…

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Q: Measurements show that the enthalpy of a mixture of gaseous reactants decreases by 373. kJ during a…

A: We have to calculate the change in energy and nature of reaction.

Q: Thermal energy is: A form of kinetic energy. A form of potential energy. Consists of both potential…

A: Thermal energy is: A form of kinetic energy. A form of potential energy. Consists of both potential…

Q: A 1489 kg1489 kg car is traveling down the road at 100.2 km/h.100.2 km/h. While traveling at this…

A: Mass = m= 1489kg. Velocity v = 100.2km/h = 100.2×5/18 = 27.7m/s (1km/h =5/18 m/s).

Q: Part A: Exothermic and Endothermic Reactions: NH4NO3 Solution CaCl2 Solution Initial water…

A: Given, Initial water temperature of NH4NO3 solution is ----- 22°C. Final water temperature of NH4NO3…

Q: When gasoline burns, it reacts with oxygen in the air and forms hot gases consisting of carbon…

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Q: The formation of water is an exothermic reaction:      2H2 (g) + O2 (g) à 2H2O (g)   a)    For an…

A: Balanced Reaction for the formation of water  2H2 (g) + O2 (g) --> 2H2O (g)  Hydrogen gas and…

Q: Which of the following statements is true about an exothermic reaction? 1. We can determine the…

A: An exothermic reaction is the one that releases energy during the reaction. This can be observed…

Q: Measurements show that the enthalpy of a mixture of gaseous reactants increases by 338. kJ during a…

A: Enthalpy change(∆H) = 338 KJ Work (W) = +135 KJ (positive because work done on the system)

Q: During an endothermic reaction in a beaker if we are part of the surroundings and touched the…

A: Given: The reaction is endothermic.

Q: A 25.0 g sample of silver metal was heated to 170 °C and then placed in a calorimeter holding 50.0 g…

A: Given: The initial temperature of Silver = 170oC Initial temperature of water = 20.0oC Final…

Q: Matter undergoing chemical reactions and physical changes that absorb heat can be classified as…

A: Given, Matter undergoing chemical reactions and physical changes that absorb heat can be classified…

Q: Examples 1) A calorimeter containing 200.0 g of water at an initial temperature of 25.0 °C was used…

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Q: For the combustion of methane(CH4)   CH4 (g)  + 2 O2 (g)  -->  CO2 (g) + 2H2O (g)       Δ H = -882…

A: In a thermochemical equation, the term, ∆H , represents the change in heat energy per mol reaction.…

Q: Cooking an egg is one type of process, while the formation of snow is another. Which answer best…

A: In Endothermic  Reaction  Heat is absorbed  while in Exothermic  Reaction  heat is Released.

Q: Which one of the following is an endothermic process? A Hydrochloric acid and barium hydroxide are…

A: The energy difference of the products and reactants is known as the energy change of a reaction.

Q: Questioh 4 Calcium carbonate breaks down into calcium oxide and carbon dioxide when heated. The…

A: given, calcium carbonate = calcium oxide + carbon dioxide   products have greater energy than…

Q: The reaction: 2 Na + Cl2 --> 2 NaCl + 822 kJ, is Group of answer choices exothermic protothermic…

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Q: Energy being absorbed in a substance that causes it to get cooler is known as what type of reaction?…

A: Solution All chemical processes area unit in the midst of energy changes. once a reaction takings,…

Q: The reactants of a chemical reaction are initially at room temperature, as is the reaction…

A: Exothermic reactions results in the evolution of heat while endothermic reactions results in the…

Q: 1. The combustion of ethene, C2H4, is an exothermic reaction. Use the information below to determine…

A: Given, Chemical Reaction : C2H4 + 3 O2 ---> 2 CO2 + H2O  ∆H = -1390 KJ

Q: To chill beverages quickly, mix ice and salt and put the cans/bottles in the iced saltwater. The…

A: Given: ∆Hlattice for the reaction NaCl(s)--->Na+(g)+Cl-(g) is 788 kJ/mol

Q: aluminum metal has a specific heat of 0.901 j/g*c. How much heat is transferred to a 6.75 g peice of…

A: Given,Mass of aluminium = 6.75gInitial temperature = 20 degree CelsiusFinal temperature = 100 degree…

Q: Measurements show that the enthalpy of a mixture of gaseous reactants decreases by 257. kJ during a…

A: Study of flow of matter is called thermodynamics. Thermodynamic processes are of different types.…

Q: 2. Describe what happens when two objects that have different temperatures come into contact with…

A: The driving force of our surroundings is the energy.  We are surrounded by nature in various forms.…

Q: Calcium carbonate breaks down into calcium oxide and carbon diox- ide when heated. The products have…

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Q: Which of the following types of energy is a form of potential energy?   a. electrical energy   b.…

A: Energy : Capacity to do work is called 'Energy' . Types of energy : It may exist in kinetic,…

Q: Which of the following will ALWAYS result in an endothermic process?

A: Endothermic reactions are the chemical reactions which proceed with the absorption of heat energy…

Q: A chemist measures the energy change AH during the following reaction: C,Hg(9)+50,(9) → 3 CO 2(g)+…

A: Answer :-  a) Exothermic  b) Yes, released  c) 1.83 × 103 kJ…

Q: Part A: Exothermic and Endothermic Reactions: NHẠNO3 Solution CaCl2 Solution b. Initial water…

A: Part A) Exothermic and endothermic reactions In NH4NO3, the final temperature of the solution…

Q: Propane reacts with oxygen gas to produce carbon dioxide and water as shown in the reaction below.…

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Q: When sulfuric acid is poured on sugar the volume expands, it turns black and gets very hot. Which of…

A: A reaction is said to be exothermic when heat is liberated during the process.

Q: Identify the process which undergoes exothermic process. A. Cooking egg B. Baking bread C. Burning…

A: Heat, light, and sound are all forms of energy released by chemical reactions. Exothermic responses…

Q: In an exothermic reaction:

A: 1) ANS: A SURROUNDINGS ABSORB HEAT FROM THE REACTION MIXTURE HEAT RELEASED FROM REACTION MIXTURE…

Q: In order to break water into hydrogen and oxygen, water is heated to more than 500°C. Which kind of…

A: We have to predict the kind of reaction and reason.

States of Matter

The substance that constitutes everything in the universe is known as matter. Matter comprises atoms which in turn are composed of electrons, protons, and neutrons. Different atoms combine together to give rise to molecules that act as a foundation for all kinds of substances. There are five states of matter based on their energies of attraction, namely solid, liquid, gases, plasma, and BEC (Bose-Einstein condensates). 

Chemical Reactions and Equations

When a chemical species is transformed into another chemical species it is said to have undergone a chemical reaction. It consists of breaking existing bonds and forming new bonds by changing the position of electrons. These reactions are best explained using a chemical equation.