What I had learned in Term 2

I learned physics in term 2 as while and I am going to reflect on what I had learned. But because I learned a lot of things in term 2 and I am unable to address them all so in this post, I am going to focus on only 3 main points and they are: Density, elements compound mixture and separation techniques.

The first point is Density. Density is basically mass divided by volume. The equations is p = M/V. Where P = Density, M = Mass and V = Volume. Density is a measurement of which object floats or sinks within another matter. So, if the density of a rock is higher then the density of the water, the rock sinks in the water. Which means, the object with the higher density sinks and the object with a lower density floats. Density is useful because with density, we can make ships float, with density, we can make planes fly, with density, we could create a lot of other awesome inventions like floats, beach ball, etc.etc. That is why density is important.

The second point is elements, compounds and mixtures. A Element is made of atoms but they cannot split into 2 or more substances through chemical reaction and they are considered as 1 of the simplest matter. Each element has a given name and a chemical symbol like magnesium(MG). Currently, there have been 109 elements discovered whereby 92 occur naturally and the rest are man-made. Elements are classified in the periodic table whereby a vertical column of elements is called a group and a horizontal column of elements is called a period. A compound is 2 or more elements chemically combined together. Some examples of compounds are water, carbon dioxide, copper sulfate etc. etc. Compounds are chemically combined together, similarly, it needs to be chemically separated. The properties of a compound is different as compared to the properties of the elements that make up the compound. Lastly, a mixture is 2 or more substances not chemically combined together. Such examples are Milo, cream, sweet etc. etc. A mixture can be separated by physical means and it has the same properties as compared to the substance that make up the mixture. This is elements, compounds and mixtures.

The third point is separation techniques. Separation techniques are techniques used to separate compounds and mixtures. Such examples of techniques are filtration, evaporation, distillation, crystallization and electrolysis. Filtration, evaporation and crystallization are used to collect the solute. Distillation is used to collect the solvent and electrolysis is used to collect the elements from a compound. Filtration, evaporation, crystallization and distillation are used to separate mixtures and electrolysis is used to separate compounds. The filtration method is used by pouring the mixture through the filter paper and collecting the residue on the paper. Evaporation to dryness to is used by evaporating the mixture to dryness and collecting the residue afterwords. Crystallization is used by evaporating the mixture to a saturated solution before cooling it down slowly, turning the mixture into a crystal, collecting the solute afterwords. Distillation is used by creating a distillation set-up to boil the mixture and condense it to get the solvent. Lastly, electrolysis is just allowing electricity to pass through the compound and wait for the elements to separate from the compound.

These are what I learned in Term 2.