Chem talk (Solution)

Electrolytes

Electrolytes are the substance that disslove in water to make a solution that can conduct electricity. We used a conductivity tester to know if the solution conduct electricity. To let the solution conduct it needed to have a charge particles that can move around. All of the solution we tested are all dissolved in distilled water, however only the one that break into charge particles when dissolve are electrolytes. For the solution to conduct electricity there must be 2 condition that must met. The charge particles must be present and move around. However some compound dissolve to form charge particles called ions.

Chem Talk 5 ( Light)

In this section we examined the colors that make the visible light. Also we have used LEDs to find out about glow in the dark stars. The energy that form light are called the electromagnetic radiation. This also includes X-rays, UV rays, microwaves, waves, they are all in addition to visible light. In light there is wavelength and energy. The wavelength of a light is the distance between the 2 point.

Chem Talk 4 ( Redox reaction )

Metal

Metal is shinny and it have lots of properties. Metal conduct electricity, this is why they are used in electrical circuits. Also metal can withstand high temperatures, this is why they are used in building strong structure and cookware because they conduct heat. We can change Metal shape, with a hammer. Most of the element in the periodic table are metal. It is on the left side of the table.

Reaction

Neutral metal can make special reaction, such as Zn, the ions. The reaction are called oxidation-reduction reactions or redox. Oxidation is like a atom is giving up its energy or the electron. For Reduction is the atom that take in or receive the energy or the electrons. Together they are called the Redox Reaction.

Stoichiometry

This lab is about moles and molar mass. A mole is usually used to count a very large or small object, its like a counting word. But in this section the number doesn’t matter a lot. The important is that one mole of anything must equal to the same quantity. Also one mole of any atom or a molecules has a mass equal to its atomic or molecular mass in grams. And one mole of any gas at (STP) will make the same volume. When the temp of a gas increase, the volume in the gas also increase. In this lab we also have to do some calculation for many thing, like number of moles, volume, mass, and more.

Energy and entropy changes in chemical reaction(balloon)

In this lab we use CO2 gas to blow up a balloon to 6cm. In our class we have 4 group and we use different materials and different amount of gas in each group. For my group I used a baking soda and a vinegar to blow up the balloon. It work very good. In this investigation there is often a change in energy that is involved, which mean energy with move around from place to others place. If energy needed to loses their energy its has to go somewhere, it cant just disappear. On the other hand, if a energy wanted to gain energy, the energy must come from somewhere, they doesn’t just appear. If you want more energy you need to put more energy, for example heat. However most change does not involve only energy, but how the particles is organized too. Its like how much space does the individual particles have to move.

Color Pigments

In this section we played with insoluble compounds, they also used for pigments for paints. We mixed the pigments with water or liquid. If the pigment is insoluble in the water, it will become suspension of particles inside the mixed water. If it is dry the pigment will get left behind. There is thousands of reactions that can mixed in this word. In this Lab we mixed a lot of things including white egg, oil, water and more. It is very interesting.

The Electron-Sea model of metal

In every metal the atom is held together by metallic bonds. These bond shares valence electron together to held a metal. When we go in closely to the atom we will see a large spheres and a small one. Large one represent metal cations, positive charge. However, metal doesn’t hold on together very tightly because of the valence. The negative charge are moving inside and also effect the holding of positive charge ion that is somehow in fixed position.

Reactivity of metal

In this lab we looked at the reactivity of many metal. Mostly it is depend on the valence of the electrons. Usually protons and neutrons is in the nucleus, however the electron are the energy level around the nucleus. Electron is like the shell of the atom and used its energy to reactivity with other element. Also in chemical reaction metal usually lose electron to others substances. When metal lose the electron it became positive or ions. Valence is also important for metal. To find each valence in a meatal is very easy, by looking at the periodic table. Metal that are in group 2A all have two and the same to every group. 3A has 3, 6A has 6.

Section 6 (Electricity)

In this section I learned about solution that conducts electricity, one of the word in this section was electrolytes, which means a substance that dissolve in water to create a substance that conduct electricity. In this section we needed a conductivity tester to see if the substance or the solution conduct with electricity. Mostly the substance that conduct needed to have a particles that can be moved around. To see does the substance dissolved is when the substance is broke into charged particles when it is dissolve, which mean it is electrolytes. When about learned about ion, ions is when a compound dissolve in water to create a charge particles. There is also a molecules that do not form ions in a solution, these are non electrolytes. Lastly the molecular compound doesn’t break into ions when they are dissolved, for example sugar.

Section 4

This lab is about metal. In metal the atom are together by the metallic bonds. These bonds share valence electron among them. But metal doesn’t hold on tightly to the valence. We learn that metal have a crystalline like a diamond. Metal have a crystal structure with a valence around it. The electron can move around so when we heat it with fire or hammer it, its can move past each others and become red, this is called the malleability. We can make them soft, strong or flexible, is really up to us and which way we are doing it.