The Seven Periods
1. First period The first period has two elements - hydrogen and helium. 2. Second and third period The second and third periods are known as short periods. Each consists of eight elements. The second period starts with lithium (Z = 3) and ends with inert gas neon (Z = 10)...
.. Viewers learn that certain fundamental factors influence the rates at which chemical reactions take place. Catalysts and their alternate reaction paths, and the role of equilibrium in the chemical industry, are also included in the study of influential factors on chemical reactions. A Coronet release. Grade Levels: 7 to Adult 20 minutes, color. Direct link to purchase the DVD: www.phoenixlearninggroup.com
Vision Statement, Administrative Details Introduction Taxonomy of Chemical Species Origins of Modern Chemistry View the complete course at: ocw.mit.edu License: Creative Commons BY-NC-SA More information at ocw.mit.edu More courses at ocw.mit.edu
Question : Hello, I have this homework booklet that has to be in for tomorrow or you get a big fat F, I am really stuck on 2 of my questions
1) Use the particle model to explain why both small and large crystals of the same substance have the same shape
2) Liquids take the shape of their containers and they can be poured. Use the particle model to explain these properties.
I know these might seem easy but I just cant get my head around it!!
Any one who helps me will be a life saver!! REMEMBER I ..
Answer : Ok, this is from poor memory, however: 1) crystals of the same type are made of the same substances, the size they are just depends on the time the took to cool. Therefore the structure of the atoms is the same no matter what the size 2) molecules in a liquid state are held together by weak intermolecular force, therefore the shape they take can be easily modified, however the molecules don't break, i.e. H(2)0 will still be H(2)O, but just in a different place. They can be poured/modified to the container shape as the bonds break and reform to different molecules when a force is introduced Hope this helps, i'm 99% sure this is right.. More from Yahoo Answers
Answer : Ok, this is from poor memory, however: 1) crystals of the same type are made of the same substances, the size they are just depends on the time the took to cool. Therefore the structure of the atoms is the same no matter what the size 2) molecules in a liquid state are held together by weak intermolecular force, therefore the shape they take can be easily modified, however the molecules don't break, i.e. H(2)0 will still be H(2)O, but just in a different place. They can be poured/modified to the container shape as the bonds break and reform to different molecules when a force is introduced Hope this helps, i'm 99% sure this is right.. More from Yahoo Answers
Question : what is saturated substance?
What is unsaturated substance?
__________ is frequently used to separate particles from a mechanical mixture.
__________ affects the dissolving rate of solutions.
Answer : saturated substance is when every available bond is covered with hydrogen.There are no kinks(bends) in saturated molecules making them linear and easily stack on top of eachother which makes them solid at room temperature.(butter) Unsaturated means "NOT covered with hydrogen" Also, unsaturated has double bonds between carbon molecules and have a zigzaged shape that does not stack on top of eachother easily. This makes them liquid at room temp. (canola oil).. More from Yahoo Answers
Answer : saturated substance is when every available bond is covered with hydrogen.There are no kinks(bends) in saturated molecules making them linear and easily stack on top of eachother which makes them solid at room temperature.(butter) Unsaturated means "NOT covered with hydrogen" Also, unsaturated has double bonds between carbon molecules and have a zigzaged shape that does not stack on top of eachother easily. This makes them liquid at room temp. (canola oil).. More from Yahoo Answers
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