Chapter 8 SABIS Grade 10 Part 4

Lesson 4: 🔥 The Energy Stored in a NucleusPart 1: 🔬 Useful InformationSample Question 22🧲 Discovering the Positron What is a positron?a) It is a particle that forms a neutral atom with one β particle.b) It is as massive as an electron but with a positive charge.c) It is the nucleus of a hydrogen atom.d) It is the nucleus of a helium atom.e) It has a mass of 2 and a charge of 4+.Sample Question 23🔍 Understanding α Particles What is an α particle?a) It is a particle that forms a neutral atom with one β particle.b) It is an electron with a positive charge.c) It is the nucleus of a hydrogen atom.d) It is the nucleus of a helium atom.e) It has a mass of 2 and a charge of 4+.Part 2: 🌌 Energy Changes in Nuclear ReactionsSample Question 24🔥 Comparing Heat in Chemical and Nuclear Changes Which of the following is correct about the relative magnitude of the heat involved in nuclear and chemical changes?a) Nuclear changes usually involve energies of tens of kilojoules per mole.b) Chemical reactions usually involve energies of tens of kilojoules per mole.c) Chemical reactions usually involve energies of about a thousand kilojoules per mole.d) Chemical reactions usually involve energies of several million kilojoules per mole.e) Nuclear reactions usually involve energies of tens of millions of kilojoules per mole.Sample Question 25🧩 Balancing Nuclear Reactions To complete the following equation so it becomes balanced:92𝑈 235 + 0𝑛 1 ➔ 56𝐵𝑎 141 + 36𝐾𝑟 92energya) Three neutrons should be added to the left hand side.b) Three protons should be added to the right hand side.c) Three protons should be added to the left hand side.d) Four hydrogen atoms should be added to the right hand side.e) Three neutrons should be added to the right hand side.Sample Question 26🔬 Recognizing Nuclear Fission Reactions Which of the following is a nuclear fission reaction?a) 𝐻 + 1𝐻 3 1 2 ➔ 𝐻𝑒 + 0𝑛 1 2 4b) 𝟏𝒆 𝟎 + 𝟗𝟒𝑷𝒖 𝟐𝟑𝟗 ➔ 𝒀 + 𝑪𝒔 + 𝟏𝑯 𝟐 𝟓𝟓 𝟏𝟒𝟔 𝟑𝟗 𝟗𝟏c) UF6(l) ➔ UF6(g).d) C(s) + O2(g) ➔ CO2(g).e) U(s) + 3F2(g) ➔ UF6(g).Sample Question 27🔒 Conservation in Nuclear Reactions Which of the following is conserved in nuclear reactions?a) Charge.b) Number of nucleons.c) Atoms.d) Kinetic energy of molecules.e) Neutrons.Part 3: 🌐 Mass, a Form of EnergySample Question 28🧠 Mass of a Nucleus The mass of a nucleus:a) Is determined by adding the masses of the nucleons it contains.b) Is determined by adding the masses of the nucleons it contains and the electrons around it.c) Is determined by subtracting the charge from the mass number.d) Is determined by subtracting the atomic number from the mass number.e) Could be different from the sum of the masses of its nucleons.Sample Question 29🚀 Mass Lost in Nuclear Reactions In nuclear reactions where mass is lost:a) The equation needs to be balanced properly.b) Charge is also lost.c) The mass will be gained by another reaction.d) The mass reappears as other particles (mass can never be lost or destroyed).e) It changes to energy according to E = mc2.Sample Question 30🔥 Understanding Nuclear Fusion Reactions In nuclear fusion reactions:a) A large nucleus splits into smaller nuclei.b) Two nuclei come together to form a larger nucleus.c) Is exemplified by 𝑯 + 𝟏𝑯 𝟑 𝟏 𝟐 ➔ 𝟐𝑯𝒆 𝟒 + 𝟎𝒏 𝟏energyd) Is exemplified by 𝑈 + 0𝑛 1 92 235 ➔ 56𝐵𝑎 414 + 𝐾𝑟 + 30𝑛 1 36 92energye) The mass is released as energy.Congratulations! 🎉 You've completed Lesson 4 and delved into the intriguing realm of nuclear energy and reactions. You've explored positrons, α particles, nuclear fission, and fusion. Keep up the amazing work as you venture further into the captivating world of nuclear chemistry! 🌌🚀