Homework Answers
To burn a substance heat is required, so the second option is endothermic.
Steam releases heat when converted to water.
Liquid sodium releases heat when become solid.
Water evaporates from body without heat donation.
Ice formation is accompanied by heat release.
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Question 6 1 pts Which one of the following processes is endothermic? O Steam condenses to...
Which one of the following processes is endothermic? Water freezes to form ice. O Propane gas...
Which one of the following processes is endothermic? Water freezes to form ice. Propane gas burns in a gas grill. Water evaporates from your skin after stepping out of the shower. Steam condenses to liquid water. Liquid sodium freezing to a solid.
please please quick hrllp on these Question 14 Arrange the following species in increasing size: AI,...
please please quick hrllp on these
Question 14 Arrange the following species in increasing size: AI, A13+, S, and S2- 52- <AL<S<A13+ Al3+ < Al<5<52 S<A13+ < Al < 52 52- <Al<A13+ <5 A13+ <S< Al < 52 D Question 15 What is the average bond order for a Si–O bond in the ion SiO32-? O 1 2/3 3/2 2 4/3 Question 11 Which one of the following processes is endothermic ? Steam condenses to liquid water. Propane gas burns...
An aqueous solution of HCl is added to an aqueous solution of NaOH in a coffee...
An aqueous solution of HCl is added to an aqueous solution of NaOH in a coffee cup calorimeter. The reaction is that of neutralization between the acid and the base: HCI + NaOH H2O + Naci To calculate the approximate enthalpy change for this reaction using q-m•C•AT. what value should the student give to C in the equation ? O The student must use the heat of formation of water. The student must use the heat of formation of Naci....
In which of the following reactions is A.Sº expected to be positive? Select one: O a....
In which of the following reactions is A.Sº expected to be positive? Select one: O a. None of these O b. 2CH(9) - 702(9) - 4C02() + 6H 0(1) c. H 0() = 250.(g) —HSO4(1) d. Gali) — Ga(s) e CO2(g) –C023) The following processes occur spontaneously at 25 °C. Which of these processes is/are endothermic? Ammonium nitrate, NH,NO. dissolving in water (which is accompanied by a cooling of the water) The expansion of a real gas into a vacuum...
O Assignment Score: 40.9% Resources Hint Check Answer Question 22 of 22 > Phase changes are...
O Assignment Score: 40.9% Resources Hint Check Answer Question 22 of 22 > Phase changes are transitions between solid, liquid, and gas phases. For example, ice melting is an example of a phase change from a solid (ice) to a liquid (water). Phase changes involve changes in energy. Which of the statements regarding phase changes are true? Deposition is the conversion of a gas to a solid. Melting is the conversion of a solid to a liquid. Sublimation is the...
26. Which of the following processes is NOT spontaneous? a. Iron in moist air rusts. b....
26. Which of the following processes is NOT spontaneous? a. Iron in moist air rusts. b. Carbon dioxide and water react to form sugar and oxygen gas. c. Liquid water in a freezer turns to ice. d. A spark ignites a mixture of propane and air. e. Baking soda (sodium hydrogen carbonate) reacts with lemon juice (dilute citric acid).
QUESTION 7 Which of the following is a chemical change? O a. A damp towel dries....
QUESTION 7 Which of the following is a chemical change? O a. A damp towel dries. b. Peanuts are crushed. O c Water condenses on a mirror. O d. At least two of the above (a-d) exhibit a chemical change. e. A "tin" can rusts QUESTION 8 A homogeneous mixture is also called a. a compound. b. a pure substance. c. a heterogeneous mixture. d. a solution. e. an element. QUESTION 9 In which phase of water are the molecules...
D Question 1 0.5 pts Which of the following molecules would exhibit dipole-dipole interactions between molecules?...
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Problems 1 through 5 below refer to the following graph. A 200 gram ice sample is...
Problems 1 through 5 below refer to the following graph. A 200 gram ice sample is placed in a closed (and otherwise evacuated) beaker on top of a bunsen burner. The initial temperature of the ice is -20 degrees Celcius. It is heated until all of the ice melts and turns into water, the water is heated until it boils, and it continues to be heated until all of the water turns into steam. The temperature of the water (in...
12:47 1 Exit Question 1 0.5 pts When 34.8 g of sodium chloride is dissolved in...
12:47 1 Exit Question 1 0.5 pts When 34.8 g of sodium chloride is dissolved in water, 2.31 kJ of energy is absorbed. Is the enthalpy of dissolution of NaCl exothermic or endothermic? Endothermic Exothermic Question 2 0.5 pts What is the balanced thermochemical equation for the combustion of two moles of gaseous acetylene, C2H2, with oxygen to produce carbon dioxide and water vapor at 24.59°C given that 2512 kJ of heat is released at a constant pressure of 1.14...
Which one of the following processes is endothermic? Water freezes to form ice. Propane gas burns in a gas grill. Water evaporates from your skin after stepping out of the shower. Steam condenses to liquid water. Liquid sodium freezing to a solid.
please please quick hrllp on these
Question 14 Arrange the following species in increasing size: AI, A13+, S, and S2- 52- <AL<S<A13+ Al3+ < Al<5<52 S<A13+ < Al < 52 52- <Al<A13+ <5 A13+ <S< Al < 52 D Question 15 What is the average bond order for a Si–O bond in the ion SiO32-? O 1 2/3 3/2 2 4/3 Question 11 Which one of the following processes is endothermic ? Steam condenses to liquid water. Propane gas burns...
An aqueous solution of HCl is added to an aqueous solution of NaOH in a coffee cup calorimeter. The reaction is that of neutralization between the acid and the base: HCI + NaOH H2O + Naci To calculate the approximate enthalpy change for this reaction using q-m•C•AT. what value should the student give to C in the equation ? O The student must use the heat of formation of water. The student must use the heat of formation of Naci....
In which of the following reactions is A.Sº expected to be positive? Select one: O a. None of these O b. 2CH(9) - 702(9) - 4C02() + 6H 0(1) c. H 0() = 250.(g) —HSO4(1) d. Gali) — Ga(s) e CO2(g) –C023) The following processes occur spontaneously at 25 °C. Which of these processes is/are endothermic? Ammonium nitrate, NH,NO. dissolving in water (which is accompanied by a cooling of the water) The expansion of a real gas into a vacuum...
O Assignment Score: 40.9% Resources Hint Check Answer Question 22 of 22 > Phase changes are transitions between solid, liquid, and gas phases. For example, ice melting is an example of a phase change from a solid (ice) to a liquid (water). Phase changes involve changes in energy. Which of the statements regarding phase changes are true? Deposition is the conversion of a gas to a solid. Melting is the conversion of a solid to a liquid. Sublimation is the...
26. Which of the following processes is NOT spontaneous? a. Iron in moist air rusts. b. Carbon dioxide and water react to form sugar and oxygen gas. c. Liquid water in a freezer turns to ice. d. A spark ignites a mixture of propane and air. e. Baking soda (sodium hydrogen carbonate) reacts with lemon juice (dilute citric acid).
QUESTION 7 Which of the following is a chemical change? O a. A damp towel dries. b. Peanuts are crushed. O c Water condenses on a mirror. O d. At least two of the above (a-d) exhibit a chemical change. e. A "tin" can rusts QUESTION 8 A homogeneous mixture is also called a. a compound. b. a pure substance. c. a heterogeneous mixture. d. a solution. e. an element. QUESTION 9 In which phase of water are the molecules...
D Question 1 0.5 pts Which of the following molecules would exhibit dipole-dipole interactions between molecules? O co2 O Cl2 O BCI, O ASH3 XeF4 Question 1 0.5 pts Formation of solutions where the process is endothermic can be spontaneous provided that the solvent is a gas and the solute is a liquid. the solvent is water and the solute is a gas. they are accompanied by another process that is exothermic. O they are accompanied by an increase in...
Problems 1 through 5 below refer to the following graph. A 200 gram ice sample is placed in a closed (and otherwise evacuated) beaker on top of a bunsen burner. The initial temperature of the ice is -20 degrees Celcius. It is heated until all of the ice melts and turns into water, the water is heated until it boils, and it continues to be heated until all of the water turns into steam. The temperature of the water (in...
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