MHF4U1-ASSIGNMENT CHAPTER 6B

15a

Probability Scores 0.05 0 0.15 2 0.35 3 0.05 6 0.3 8 0.05 9 0.05 14 Find the expected value of the above random variable.   _________

3. Enthalpy change is defined as a. the energy that is transferred into or out of a system when the pressure is constant and only P–Vwork is done. b. the change in internal energy of a system when the pressure is constant. c. the change in internal energy of a system when the volume is constant. d. the energy that is transferred into or out of a system when the pressure is constant and no work is done. e. the change in internal energy of a system when the pressure is constant and no work is done.

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Which has the least kinetic energy?   A. xenon moving at a velocity of 450 m/sec   B. helium moving at a velocity of 450 m/sec   C. argon moving at a velocity of 450 m/sec   D. krypton gas moving at a velocity of 450 m/sec

Please answer a through d

ORT SHEET Heat of Neutralization EXPERIMENT elemsboomfchg lom 12 A. Heat Capacity of Calorimeter 1. Temp. of calorimeter and water before mixing 2. Temp. of warm water °C 22.0 39,0 30.3 3. Maximum temp. determined from your curve °C 4. Heat lost by warm water (temp decrease x °C 50.0 g x 4.184 J/K-g) = 02), 5. Heat gained by cooler water (temp. increase x 50.0 g x 4.184 J/K-g) = 30,3 22.0)x 13626J s0.0gmpi S0.0gy 6. Heat gained by the calorimeter [(4) – (5)] = 7. Heat capacity of calorimeter: heat gained by the calorimeter temperature increase J/K 3. Heat of Neutralization of HCl-NaOH 22.2 22.2. °C . Temp. of calorimeter and NaOH Temp. of HCI AT determined from your curve after adding HC1 °C to the NaOH Heat gained by solution (temperature increase x ON 100 g x 4.184 J/K-g) = 9977.8J %3D Heat gained by calorimeter (temperature increase x heat capacity of calorimeter) = J %3D Total joules released by reaction [(3) + (4)] = Tight O 2018 Pearson Education, Inc.

Which statement A-D about a state function is not correct? a. The value of a state function can change along a path. b. The final value of a state function is independent of the path taken to reach the final state. c. All forms of energy must be state functions because energy is conserved in any process. d. Examples of state functions only occur in chemistry and physics and not in real life. e. Statements A-D all are correct.

25. A family of compounds that often have a pleasant smell.  The are commonly found in fruits.  26. Give an example of a ketone and state a common, well-known use or source for that same substance. 29. Use the down arrow on the far left of the row of icons above the space where you enter your answer to access the superscript "x2" function.   Write the symbol for the potassium ion

The water in the calorimeter was found to be 20.0oC.  The line gave a value of 33.6oC at 120 s (the time of mixing for this trial).  The ΔT for the heat calculation was  a. 13.6*c b. 20.0*c c. 33.6*C D. 53.6*C

need help finding the kj

The radioactive element carbon 14 Has a 1/2 life of 5750 years a scientist determined that the bones from a mastodon had lost 51.9% of their carbon 14 .how old were the bones at the time they were discovered? Round to the nearest integer

37. A student recorded the following data for the alcohol content of a blood sample: % C.H5OH: 0.084, 0.068, and 0.079. Calculate the 95% confidence limit for the average of this data.

6. GENERALIZATION Direction: MODIFIED TRUE or FALSE: Write the word TRUE if the statement is correct and if not, underline the word or statement that sentence incorrect and write the correct answer on your answer sheet. Write your answer on a separate sheet of paper. swer 1. The law of conservation of energy states that energy can either be created or destroyed. 2. A closed system is a system that has external interactions, such as energy transfers into or out of the system boundary. 3. According to the first law of thermodynamics, when heat enters or leaves a system, the system gains or loses an amount of energy equal to the amount of heat transferred. 4. A measure of energy transfer that occurs when an object is moved over a distance by an external force is known as heat. 5. The transformation of chemical energy into kinetic and heat energy by a car engine is a manifestation of the first law of thermodynamics. 6. An open system could not create or destroy energy. 7. Energy is a…

are the tables above correct?

Which of the following regarding state and path functions is FALSE? a. The value of a path function depends on how change occurs. b. The value of a state function does not depend on the history of the system. c. Heat and work describe the manner in which a system attains its current energy. d. The internal energy of a system can be the result of many combinations of work and heat. e. The value of a state function depends on the nature in which it was attained.

Is “what is the typical distance a moped can be driven on a single tank of gas?” A statistical question? Explain your reasoning.

A chemist fills a reaction vessel with 3.61 atm nitrogen (N,) gas, 8.64 atm oxygen (0,) gas, and 6.55 atm nitrogen monoxide (NO) gas at a temperature of 25.0° C. Under these conditions, calculate the reaction free energy AG for the following chemical reaction: N,(g) + O,(g) = 2NO (g) Use the thermodynamic information in the ALEKS Data tab. Round your answer to the nearest kilojoule. do Data HNO3 (1) -174.1 HNO3 (g) -133.9 Oxygen OH (aq) H20 (1) -285.8 H20 (g) -241.8 02 (9) H202 (1) -187.8 H202 (9) -136.3 Phosphorus Explanation Check P4 (s) 2021 McC

A positive delta E results when the system ..... energy from the surroundings

DENSITY Learning Objectives After completing this Lecture Tutorial, students should be able to: explain how density is different than weight. apply the concepts of density to explain plate movement at convergent boundaries. Part 1: Comprehension of Density Density is the amount of material in a given volume. It can be thought of as how compact something is. If two objects are the same size but one is heavier, it is more dense. 1. For each of the three rows below, circle which is more dense. One row will have the same density. a bucket of ping pong balls or a bucket of golf balls or There are the same density. or There are the same density. a small piece of granite or a large piece of granite or There are the same density. 2. Three students are discussing the density of different sized rocks. Student 1: I think a small rock is less dense than a large one. When you pick them up, the small rock is much lighter than the big rock. Since density is the same thing as weight, a heavier rock is…

Is the answer going to be negative or positive?

H J K L Enter V B N M Shift Chapter 2 An Introduction to the Chemistry of Life 37 SELF-QUIZ: TESTING YOUR KNOWLEDGE 1. Each atom has a nucleus made up of р. 24. 2. In atoms, the number of protons is usually equal to the number of 3. The atomic number of an atom is equal to the number of 7. Proteins and carbohydrates consist primarily of carbon, hydrogen, and oxygen; these two molecules are types of and neutrons. -compounds. p. 31. 8. On the pH scale, a pH of is neutral; a solution with a pH less than this is this is 9. Chemicals like bicarbonate that resist pH change are called р. 25. and a solution with a pH greater than р. 32, in the nucleus. p. 26. 4 An alternative form of an atom is called an differs in the number of neutrons in the nucleus. p. 26. 5. A bond formed between two atoms that share electrons is called it p. 33. 10. When water molecules dissociate, they form and ions. p. 32. bond. p. 28. bonds form between oppositely charged atoms of a(n) polar covalent bonds of…