In fission reactions the nucleus is split and energy is released

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  • In fission reactions the nucleus is split and energy is released
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**A++ Work! 100% CORRECT PHYSICS TUTORIAL

INCLUDES ANSWERS TO THE FOLLOWING QUESTIONS

[1] In fission reactions the nucleus is split and energy is released. (2 points)

True

False

[2] The isotope chlorine-35 has a mass of 34.96885 atomic mass units, and the isotope chlorine-37 has a mass of 36.96590 atomic mass units. Given the information that 75.771% of all chlorine atoms found in nature are chlorine-35 and 24.229% are chlorine-37, calculate the atomic mass of chlorine. (4 points)

Answer:

[3] Rusting of an iron nail is not an example of a physical change. (2 points)

True

False

[4] A substance that accepts hydrogen ions is a base. (2 points)

True

False

[5] During an Exothermic Reaction _____ . (4 points)

[A] energy is released

[B] energy is absorbed

[6] Groups on the periodic table list elements with similar properties. (2 points)

True

False

[7] An ion is an atom or molecule that has gained or lost electrons (2 points)

True

False

[8] What factor below does not influence the Rate of a Reaction? (4 points)

[A] temperature

[B] surface area

[C] catalyst

[D] concentration of reactants

[E] molar mass

[9] Fusion reactions power stars. (2 points)

True

False

[10] During an Endothermic Reaction _____ . (4 points)

[A] energy is not released

[B] energy is not absorbed

[11] 4.00 grams of NaOH have been added to 2.00 liters of water. The molarity of this solution is _____ M. (4 points)

Answer:

[12] Acids donate hydrogen ions. (2 points)

True

False

[13] The concentration of the solution in question 11 is _____ grams of NaOH per liter of water. (4 points)

Answer:

[14] Sea water is an example of a mixture. (2 points)

True

False

[15] Which of the following is not a mixture? (4 points)

[A] distilled water

[B] salt water

[C] sugar water

[16] Isotopes of an atom have the same number of but different numbers of . (4 points)

[A] neutrons, protons

[B] protons, neutrons

[C] neutrons, electrons

[17] The pH of a solution depends on the amount of alpha radiation. (2 points)

True

False

[18] In chemistry a mole is not ____ (4 points)

[A] the number of atoms in 12.011 g of C

[B] the number of molecules in 18.015 g of water

[C] Avogadro's number of atoms or molecules

[D] a blind rat-like creature

[19] 38 grams of F2 react according to the following chemical equation: F2 + 2NaI -> I2 + 2NaF. As a result of this reaction _____ grams of I2 are produced. (4 points)

Answer:

[20] Given the following reation: N2H4 -> 2H2 + N2, how many moles of H2 will be produced if 3 moles of N2H4 react? (4 points)

Answer:

[21] What is the hydroxide-ion concentration of a solution if its hydronium-ion concentration is 5 x 10^-5 mole per liter? (4 points)

Answer:

[22] The pH of the solution in question 21 is _____ . (4 points)

Answer:

[23] Emission spectra can be used to identify atoms. (2 points)

True

False

[24] If you are given 200 grams of a radioactive substance that has a half-life of 30 minutes, then you will have _____ grams left after 90 minutes. (4 points)

Answer:

[25] The number of molecules in 4.00 grams of NaOH is __ . (4 points)

Answer:

[26] If radium-226 undergoes alpha decay you end up with ____ . (2 points)

[A] radon-222

[B] actinium-226

[27] If radium-226 undergoes beta decay you end up with ____ . (2 points)

[A] radon-222

[B] actinium-226

[28] _____ acts as an acid in the following reation: NH3 + PH3 -> NH2- + PH4+. (2 points)

[A] NH3

[B] PH3

[29] _____ acts as an base in the following reation: NH3 + PH3 -> NH2- + PH4+. (2 points)

[A] NH3

[B] PH3

[30] The following chemical equation is not balanced: Fe + O2 -> Fe2O3. After balancing this chemical equation Fe has the number ___ in front of it. (2 points)

Answer:

[31] The following chemical equation is not balanced: Fe + O2 -> Fe2O3. After balancing this chemical equation O2 has the number ___ in front of it. (2 points)

Answer:

[32] The following chemical equation is not balanced: F2 + NaI -> I2 + NaF. After balancing this chemical equation F2 has the number ___ in front of it. (1 points)

Answer:

[33] The following chemical equation is not balanced: F2 + NaI -> I2 + NaF. After balancing this chemical equation NaI has the number ___ in front of it. (1 points)

Answer:

[34] The following chemical equation is not balanced: F2 + NaI -> I2 + NaF. After balancing this chemical equation I2 has the number ___ in front of it. (1 points)

Answer:

[35] The following chemical equation is not balanced: F2 + NaI -> I2 + NaF. After balancing this chemical equation NaF has the number ___ in front of it. (1 points)

Answer:

[36] Which type of radiation is the least dangerous? (4 points)

[A] alpha

[B] beta

[C] gamma

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