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Elements, Compounds, and Mixtures
Transcript of Elements, Compounds, and Mixtures
It all begins with a
is substance with one type of particle. It is a group of similar atoms to make up one single substance. An example of a pure substance is an element.
is a pure substance. It can’t be broken down into a simpler substance through physical or chemical change. An element is made up of all the same atoms.
is shiny in color and is a good conductor for heat and electricity. Metals are also malleable and ductile meaning they can be pressed into thin sheets or into wire.
are in the middle compared to metals and non-metals, so it has components from both of those sections. A metalloid is a semi-conductor meaning that only some metalloids are conductors. Metalloids can vary from shiny to dull in color, and can or cannot be malleable and ductile depending on the substance.
are dull in color and are poor conductors. They are usually brittle, so they cannot be made into thin sheets or wire. Non-metals aren't as commonly seen compared to metals and metalloids.
is also a pure substance, but it is made up of a number elements that had undergone a chemical change.
is a pure substance made of elements that were chemically combined through a chemical change. Molecules of compounds are made when atoms of at least 2 elements join together. They have a set amount of components in a definite ratio. It will no longer be the same substance if that ratio is changed.
Examples of compounds:
is a combination of two or more substances that are physically combined. They can be made of elements, compounds, or both.
is a combination of two or more substances that are physically combined. They can be made of elements, compounds, or both. It can also have any ratio of components without altering the substances. Since the substances remain the same, the physical changes can just as easily be undone as it was made.
The result of a mixture could be a solution.
mixture that appears as one substance with the same appearance and properties throughout the mixture. A solution’s particles are distributed evenly among each other.
mixture is when all components of the mixture are the same.
is when a mixture is composed of different substances.)
The process in which those particles are distributing within the solution is called dissolving. Within the solution, there is a solute and a solvent. The
is what is
is what the solute is
. The solute must be
in order to dissolve in the solvent.
(soluble: able to dissolve)
Salt water is a solution where the salt is soluble. This means that since the salt can dissolve, that is the solute. The salt is dissolving in a liquid, making the water a solvent.
The Periodic Table
The Periodic Table is a chart of all the elements that are currently discovered. Each element can be classified as a metal, non-metal, or metalloid based on its properties.
Solutions can also be found in other forms such as sodas (carbon dioxide in water) and brass (zinc in copper).
Water's chemical formula is H2O. It has exactly 2 hydrogen and 1 oxygen atom per molecule, making it a compound.
House hold ingredients such as baking soda (NaHCO3) and vinegar (C2H4O2) are also compounds.
In a mixture, there are also
. In a suspension, the particles are large enough to see and go through a filter. They also have just enough weight to disperse through the solvent then settle. The particles can block light as well and must be re-shaken or stirred in order to stay mixed.
For example, a snow globe must be shaken in order for the snow to spread before it settles back to the bottom.
are another form of mixtures.
They are between solutions and suspensions and have particles too small to settle out. Colloids cannot be filtered but are large enough to scatter light.
Examples of colloids are milk, whipped cream, and gelatin.
Salt. Photography. Encyclopædia Britannica Image Quest. Web. 26 Sep 2013. http://quest.eb.com/images/132_1252291
Glass Of Water. Photography. Encyclopædia Britannica Image Quest. Web. 26 Sep 2013. http://quest.eb.com/images/156_2395901
Periodic Table. Photography. Encyclopædia Britannica Image Quest. Web. 26 Sep 2013. http://quest.eb.com/images/139_2008754
Fizzy Soft Drinks. Photography. Encyclopædia Britannica Image Quest. Web. 26 Sep 2013. http://quest.eb.com/images/132_1253843
Shiny French Horn On A White Background. Photo. Encyclopædia Britannica Image Quest. Web. 26 Sep 2013. http://quest.eb.com/images/167_3988026
Encyclopædia Britannica Image Quest, "Shiny French Horn On A White Background", accessed 26 Sep 2013, http://quest.eb.com/images/167_3988026
Water. Photography. Encyclopædia Britannica Image Quest. Web. 26 Sep 2013. http://quest.eb.com/images/300_3426650
Bottles Of Vinegar - Non Exclusive. Photography. Encyclopædia Britannica Image Quest. Web. 26 Sep 2013. http://quest.eb.com/images/156_2397964
BOX OF BAKING SODA. Photography. Encyclopædia Britannica Image Quest. Web. 26 Sep 2013. http://quest.eb.com/images/300_1829275
by Kimberly Cang
The measure of the amount of solute dissolved in solvent is
. Concentration is measured in grams of solute per milliliter of solvent (g/mL).