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Chapter 7 SABIS Grade 10 Part 3 Review

Lesson 42

🔬Chapter 7 Part 3 Review



🔎 Sample Question 41: Ionic Bonds Formation

Reactions of the alkali metals with chlorine 🎨💥🧪 What Happens When an Ionic Bond Forms? ⚛️ Which is true when ionic bonds form? a) An atom loses an electron that is gained by another atom. 🔄 b) The result is a positive ion and a negative ion. 🔵🔴 c) The total potential energy of the system is lowered, and the difference in energy is released as heat. 🌡️💡 d) Ions will be surrounded by oppositely charged ions, resulting in compounds that are solids at room temperature. 🧱 e) Every two oppositely charged ions form a molecule bonded by the ionic bond, and this molecule is loosely attracted to neighboring molecules. 🔗💫

Reactions of the alkali metals with water, hydrogen, Flame test for Li+, Na+ and K+ 🎇💧🔬 Sample Question 42: Test for Li+, Na+ and K+ How could you distinguish between lithium chloride, sodium chloride and potassium chloride using a flame test? 🕯️

  1. A red flame indicates lithium ions. 🔴

  2. A yellow-orange flame indicates sodium ions. 🟠

  3. A lilac flame indicates potassium ions. 🟣

Summary of chemistry of the alkali metals, 7.6 The Halogens 🧠💡⚗️ Sample Question 43: About Halogens Which is true about F, Cl, Br, I, At? a) They are inert (in the elementary state). 🛡️ b) They are called the alkali metals. 🥈 c) In nature, they are found as diatomic molecules. ⚛️ d) They are called the halogens. 💡 e) They constitute group 7 of the periodic table. 7️⃣

7.6.1 Physical properties of the halogens 🌡️📊💡 Sample Question 44: State of the Halogens Under Normal Conditions Under room temperature and pressure, which is true about F, Cl, Br, I, At? a) They are all gases. 💨 b) Fluorine and chlorine are gases, and the rest are solids. 💨🧱 c) Fluorine and chlorine are gases, bromine is a liquid and the rest are solids. 💨💧🧱 d) Fluorine, chlorine and bromine are gases, iodine is a liquid and astatine is a solid. 💨💧🧱 e) They are soft solids. 🧽

7.6.2 Covalent bonding in the halogens ⚛️🔗💡 Sample Question 45: What Happens When a Covalent Bond Forms? Which is true when a covalent bond forms? a) An atom loses an electron that is gained by another atom. 🔄 b) Each of two atoms provides one electron so an electron pair is shared. 👥 c) Each atom "feels" the presence of additional electron going around it. 🎡 d) Ions will be surrounded by oppositely charged ions, resulting in compounds that are solid at room temperature. 🧱 e) The two atoms sharing a pair of electrons stay together because the sharing gives them a state of lower potential energy. 🔒






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