Assignment #7

1) What surprised you about lab?
-It surprised me how well I remembered how to balance chemical reactions with almost no help from the teacher. It also surprised me how much the temperature changed with the last two reactions.

2) What was an observation that led you to think a chemical reaction occurred?
-An observation that led me to believe a chemical reaction occurred was when mixing two reactions the color changed. Also on the last two reactions the temperature changed after they were combined.

3) which reactions produced different product states?
-All the reactions produced different products. The first four produced a solid (Barium sulfate, Iron(II) ferricyanide, silver chloride and Copper(II) hydroxide). The acid-base Neutralization produce water and the last reaction produced carbon dioxide.

4) Describe salt going into water.
-Salt is a compound made up of the two elements of sodium (Na) and Chlorine (Cl). When salt is poured into water the sodium and chlorine ions will break apart from their compound into singular ions. This is because they are soluble.

5) write a chemical equation.
- NaCl + H2O --> Na + Cl + H2O

Assignment #6

1)What were today's two main topics?
-Melting points
-What will be on the exam on friday

1)Look at food or product labels in and around your home.  Post on your blog (name and formula) 5 ionic compounds that you found, and list the common product in which they are contained.
-water: Sodium Chloride: NaCl
-granola bar: Calcium Carbonate CaCO3
-teddy grahams: Zinc Oxide: Zn2O
-animal crackers: Thiamine Nononitrate: C12H17ClN4OS
-mountain due: Calcium Disodium: CaS

1)Explain why ionic compounds tend to have high melting points.
-Because the force between then is a lot smaller, according to coulomb's law this means that the melting point with be much higher.

Assignment #5

1) What were the main topics covered in class today?
-The atom

2)Describe the structure of a atom.
-Directly in the center of the atom we have the nucleus which is surround by electrons. Inside the nucleus there are protons and neutrons.

3)Explain the location and behavior of electrons.
-Electrons are right outside the nucleus in a atom. They have a negative charge. They move in waves and are able to be in one place at many different times. They "fill" up space and have a little bit more mass than a proton.

Assignment #4

1)What are the four fundamental forces in our universe?  List the two that we most commonly feel and experience everyday
-Strong nuclear force
-Weak nuclear force
-Electrostatics (most commonly feel)
-Gravity (most commonly feel)

2)Explain a situation(list liquid examples and order) in which two liquids of different densities form two layers.
-If you have water and oil in one cup they will form two different layers because they are different densities. Oil is less dense than water so it will be on top of the water.

3)Explain a situation in which two liquids of different densities form one layers.
-Some liquids will be chemically attracted to each other and will therefore be able to mix even though they have two different densities. An example of this would be water and ethanol.

4)List the density of osmium, lead, and aluminum
-Osmium=22.61 g/cm
-Lead=11.34 g/cm
-Aluminum=2.70 g/cm

4)What questions/comments do you have?
-None