Chapter 7 SABIS Grade 10 Part 2 Review

🔬Chapter 7 part 2 Review

1️⃣8️⃣: 🌬️ Which are the 10 elements that exist as gases at Standard Temperature and Pressure (STP)? ➡️ Answer: Hydrogen, Helium, Nitrogen, Oxygen, Fluorine, Neon, Chlorine, Argon, Krypton, and Xenon 🎈

1️⃣9️⃣: 💧 Can you name the 2 elements that exist as liquids at STP? ➡️ Answer: Mercury and Bromine are the ones! 💦

2️⃣0️⃣: 🔌 What properties help us distinguish between metals and non-metals? ➡️ Answer: The key is electrical conductivity. Metals usually conduct electricity, while non-metals don't. ⚡

2️⃣1️⃣: 🌡️ Which elements exist as liquids at room conditions? ➡️ Answer: Room temperature brings no changes! It's still Mercury and Bromine that exist as liquids. 🌡️

2️⃣2️⃣: 🧪 Which gaseous elements react with Potassium (K) to form white solids? ➡️ Answer: The elements are Hydrogen, Oxygen, Fluorine, and Chlorine. 💨

2️⃣3️⃣: 🏠 In the family of inert elements, which 5 gases are there? ➡️ Answer: The quiet family members are Helium, Neon, Argon, Krypton, and Xenon.

2️⃣4️⃣: 🧩 Which 5 elements have one electron less than a noble gas and correspond to atomic numbers (Z) 1, 9, 17, 35, 53? ➡️ Answer: Those elements are Hydrogen (Z=1), Fluorine (Z=9), Chlorine (Z=17), Bromine (Z=35), and Iodine (Z=53). ✨

2️⃣5️⃣: ➕ What are the 5 elements with one electron more than a noble gas, with Z = 3, 11, 19, 37, 55? ➡️ Answer: These are Lithium (Z=3), Sodium (Z=11), Potassium (Z=19), Rubidium (Z=37), and Cesium (Z=55). 🔋

2️⃣6️⃣: 👥 What are the common properties of Lithium, Sodium, Potassium, Rubidium, and Cesium? ➡️ Answer: They are shiny solids, stored under kerosene or water, and they all react with chlorine. 🎇

2️⃣7️⃣: 🔢 If Element B is placed to the right of Element A in the Periodic Table, what does it imply? ➡️ Answer: Element B has one more proton in its nucleus than Element A. ➡️

2️⃣8️⃣: 🗃️ Can you clarify what "row" and "group" mean in the Periodic Table context? ➡️ Answer: Elements in one row belong to one period, while elements in one group are in one column. Also, elements in one column share similar chemical properties. 📊

2️⃣9️⃣: 🧲 Where are metals and nonmetals located in the Periodic Table? ➡️ Answer: Generally, metals are on the left, and nonmetals are on the right. ↔️

3️⃣0️⃣: 🌈 What is true about the transition metals? ➡️ Answer: They fall between groups 2 and 3 in the Periodic Table, can form more than one charged ion, and form colored compounds. 🌈

3️⃣1️⃣: 🌡️ What can you say about the variation of boiling points and melting points of the noble gases with their atomic number? ➡️ Answer: The boiling points and melting points of the noble gases increase with the increase in atomic number. ⬆️

3️⃣2️⃣: 🔵 What electron arrangement around a nucleus makes the atom or ion stable? ➡️ Answer: Electron arrangement of 2, 10, 18, 36 around a nucleus makes the atom or ion stable. 💠

3️⃣3️⃣: 🎈 Which property of helium is incorrect? ➡️ Answer: The incorrect statement is: In nature, helium exists as He2 molecules and it reacts with oxygen at high temperatures to form He2O. ❌

3️⃣4️⃣: 💤 What is true about Ne, Ar, Kr, Xe, and Rn? ➡️ Answer: They each have 10, 18, 36 electrons around the nucleus, respectively, and can react under certain conditions to give very unstable compounds. They are also known as "noble" gases. 👑

3️⃣5️⃣: 🧂 Why is sodium chloride a very stable compound? ➡️ Answer: Sodium chloride is very stable because Na+ ion has 10 electrons around it and the Cl- ion has 18 electrons around it. These configurations mimic those of noble gases. 🧪

3️⃣6️⃣: 🍳 What is true about Li, Na, K, Rb, Cs, and Fr? ➡️ Answer: They are soft, shiny solids, easily cut with a knife. They are also known as Alkali metals, each having one more electron than a noble gas. They form stable 1+ ions which have a noble gas electron arrangement. 💎

3️⃣7️⃣: 💡 How do scientists explain the electrical conductivity of metals? ➡️ Answer: The electrical conductivity of metals is explained by the presence of free electrons that can move throughout the metallic crystal without specific attachment to particular atoms. ⚡

3️⃣8️⃣: 🔥 What is the trend in the boiling points and the melting points of alkali metals? ➡️ Answer: The boiling points and melting points of the alkali metals decrease with the increase in atomic number. 🔻

3️⃣9️⃣: ⚗️ Which of the following is true about alkali metals? ➡️ Answer: Alkali metals are very reactive and form very stable compounds. They also react vigorously with oxygen and chlorine. 🌋

4️⃣0️⃣: 🎯 What does it mean for a chemical compound to be "stable"? ➡️ Answer: A chemical compound is said to be "stable" if it has relatively low levels of potential energy. ⚖️