During this class we will explore percent composition (also called mass percent), as well as substances and mixtures. TO DO BEFORE CLASS
- Complete the Student Inventory Worksheet and bring to class.
- Watch the three videos below. (The videos are 10 minutes, 3 minutes, and 2 minutes, respectively).
- Complete the notes that I handed out in class AS YOU WATCH.
- After you finish watching, leave a comment in the block below. You should either write a summary of what you learned, or a question that you still have. OR, you can answer one of your fellow students questions. To do that, you will hit reply to their post, instead of leaving one of your own.
I will have to approve the comments before they show up on the screen. So, you won’t see them show up right away. Each comment/question is worth one point. At the end of the unit, I will add them up and they will count as a quiz grade.
https://www.youtube.com/watch?v=Kk2v6VGNK90
Percent Composition Video
Here is the second video on substances:
Here is the third video:
chemistry matters 
A mixture a non-pure substance that have the ability to be physically separated. Their atoms are not bonded together and don’t have a fixed ratio compared to substances. A solution or homogenous mixture, however, has the apperance that it’s made of one thing.
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To find the percent composition, divide the mass of the part with the total mass, then times 100.
An isomer is a compound that has 2 forms of the same molecular formula; but each have different properties.
Substances are pure matters, and mixtures are non-pure matters.
Elements are substances that are made of atoms, and compounds are substances that are made of molecules.
Both colloids and suspensions are types of heterogeneous mixtures.
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The formula for Percent composition (or percent by mass) is [mass of part/total mass]x100.
Matter is anything that takes up space and has mass. There are two types of matter:
1) Substance – pure, homogeneous, definite composition, can only be chemically separated.
2) Mixture – not pure, indefinite composition, can be physically separated.
There are two special types of heterogeneous mixtures: Colloid and suspension
Elements are made of atoms while compound are made of molecules.
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A solution is made of solids dissolved in liquids however it can also be a solid dissolved in a solid ( an alloy), or a gas dissolved in a gas.
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A solution is made of solids dissolving in liquids, however it can also be solids dissolving in solids or gases dissolving in gases.
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A solution is a solid dissolved in liquids however it can also be a solid dissolved in a solid or a gas dissolved in a gas.
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In order to find the Precent Composition of a substance you need to know the formula which is Mass of part/Total Mass]x100. A substance is pure opposed to a mixture which is not pure. In a Homogenous they all look the same rather than Heterogeneous which looks like 2 or more things
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I believe I turned in my comment for these videos to you on paper.
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