Solubility lab

In this lab we combined drops from different chemicals in a well plate and looked to see if any precipitate formed. First we gathered all of the reagents in pipettes. We then used our chart to see which of the reagents that we would be combining. When we combined the substances if no precipitate formed we put a dash through the box, but if a precipitate formed we placed its formula in the box.

Basics of chemical reactions

Chemical reactions are reactions that are usually characterized by a chemical change, and they yield one or more products. Some of the clues that a chemical reaction has occurred are color change, solid forms, bubbles form, and heat or a flame is produced. The substance or substances,  initially involved in a chemical reaction are called the reactants. What the chemical reaction yields is called a product.

Here are some examples of chemical reactions

https://en.wikipedia.org/wiki/Combustion

http://www.grandinetti.org/chemical-reactions

Formula of a chloride lab

This week the second lab that we performed this week was the formula of a chloride lab. First step in this lab was to take the mass of the beaker in which we would doing the experiment. Next we placed a small amount of zinc in the beaker and re-weighed. Then we got 10 ml of acid and mixed it in the beaker with the zinc. We placed the beaker on a hot plate and heated until all of the acid was gone from the substance. We let this cool for a few minutes and then re-weighed after this reaction.

Formula of a hydrate lab

In lab this week the first lab we performed was the formula of a hydrate lab. The first step in this lab was to measure the mass of the test tube in which we would be conducting the lab. Next we placed about 2 cm of hydrated crystal in the bottom of the test tube. Next we measured the new mass of the  test tube with the crystals in it. We then placed the test tube on the ring stand and heated the test tube for a few minutes until the color of the substance changed from blue to white. We remeasured the mass of the test tube, and then heated the test tube again to try to drive off any left over liquid.

Hydrate compounds

Hydrate compounds that have water molecules as part of their chemical formula. This contributes to crystalline structure of the compound.

http://www.mpbio.com/product.php?pid=02191403&country=223

In the picture above we have an example of a hydrate. The part of the formula in front of the dot is the anhydrous. The part behind the dot is the hydrate. The coefficient in front of the hydrate represents the moles present so in this compound there is one mole of water. When naming this compound we first take the hydrous, aluminum sulfate, and then put on the hydrate which is mono hydrate.

If you want to learn more about hydrates here are some helpful links
http://www.chem.purdue.edu/gchelp/nomenclature/hydrates_2009.htm
https://en.wikipedia.org/wiki/Hydrate

Molar conversions

In converting units from representative particles to mass, we need to first convert the representative particles into moles. We use a conversion factor to convert from representative particles to moles and then from moles to mass. These conversion factors are always the same and help guide us when trying to convert into moles, mass, volume at STP, and representative particles.

https://mrdesjardinsgg12wiki.wikispaces.com/The+Mole

In the picture above it gives us an outline of how we convert things back and forth using moles. If you want to go from moles to mass, representative particles, or volume, it takes one conversion. If you want to convert volume to mass or Representative particles it takes two steps.

Here are some links that may help you learn more about the mole road map
https://www.youtube.com/watch?v=mBVL0PHPrhg
https://www.youtube.com/watch?v=zWzA-T54pPI
https://www.youtube.com/watch?v=xPdqEX_WMjo