Hon Chemistry 1-14-22 Chap 8 Overview

HON CHEMISTRY: God bless you as you prepare for your test!! Here’s our review from today. You’re doing great on these chemical reactions! Practice, practice, practice (!!!) and also make sure you have everything memorized.

A good source of help is your online textbook at my.hrw.com. Click on the “Visual Concepts” or “Review Activities” tabs at the top of the chapter page for the extra tutorials and quizes. Also, the review activities on The Physics Classroom and sciencegeek.net would be great practice as well. I love you and I’ll be praying for you as you study for your test!!

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10 thoughts on “Hon Chemistry 1-14-22 Chap 8 Overview

  1. Ask: We learned the activity series and that the higher up, the more reactive the metal. And we also learned that gold, silver, and platinum do not react with oxygen to form an oxide. So I asked why. I learned that because the 6s orbital with one electron is contracted in gold, silver, and platinum, then this electron is very closely bound to the nucleus and therefore is less available for bonding with any other atoms. This makes these three metals very unreactive even under very hot temperatures.

  2. Ask: When a catalyst is used in a reaction, why is the catalyst not considered a reactant? A catalyst’s sole purpose is to speed up or slow down a reaction without changing the products being made. While catalysts do take part in the reaction, they are not changed or used up–therefore they cannot be considered reactants.

  3. Ask:
    Why are bubbles forming and color changes not always chemical?

    Bubbles can form in a substance that is being heated, but the identity of the substance is not necessarily changing. Gas can be released as steam, but a new gas is not always being produced. With color change, a substance changing color can sometimes indicate a chemical change. When we put the penny in nitric acid, there was a gas produced and the copper compound turned blue. In another situation, you could add red food coloring to water, and it is still water. The identity has not changed, so this is classified as physical.

  4. ASK- what causes certain elements to be more reactive than other elements?

    Reactivity is determined by the number of valence electrons needed to complete the outer shells of that element. The more valence electrons needed, the more reactive the element is. For example, the noble gasses like helium and neon have full valence shells. Therefore they don’t react with anything. But, elements like Oxygen that have 7 valence electrons readily react with many elements, attempting to “take” that one electron needed to complete its shell.

  5. Ask- Why are some metals like platinum, gold, and silver unreactive?

    Unreactive metals outer shells are completely full with electrons. Since they have all of their valence electrons, these metals to do not have to react with other elements to gain or lose electrons.

  6. A: In many of our chemical equations, oxygen was a key reactant. Why does it react with other elements so often?

    Answer: First of all, oxygen makes up a sizable part (21%) of the earth’s atmosphere. This ensures that oxygen is almost always around in some way or another. Also, oxygen is the 2nd most electronegative element after fluorine. Electronegativity is the measure of an element’s tendency to attract other elements’ electrons. This causes oxygen to react readily with other elements.

  7. Ask: Why do some metals react with steam but not water? Why do they react with the gaseous state of water but not the liquid state?

    Answer: Reactions involve energy and steam has more energy than just liquid water. So elements that are less reactive and don’t have enough energy to react with just water will react with steam. The added energy from the steam allows a reaction to occur. Therefore, so metals will have enough energy to react with liquid water, and others need more energy to cause a reaction.

  8. Ask- why are certain metals more reactive than others? Why are some metals unreactive?

    Some metals are able to give up their electrons more readily than others which makes them more reactive than others. Unreactive metals are that way because they have an outer layer that is completely full of electrons and are very stable.

  9. Ask: Why do diatomic molecules have a subscript of 2 by themselves, but not in compounds?

    Diatomic molecules don’t really exist as individual atoms, they are always bonded with some element, so when not in a compound, the molecule just bonds with itself, creating 2 atoms of that element.

  10. Ask: What makes Fluorine the most electromagnetic element?

    Fluorine is the most electronegative because it has 5 electrons in a 2p shell which basically means it’s very close to a fully complete electron because the 2p is supposed to have 6 electrons. This causes the nucleus to hold very tightly on to him.

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