Wednesday, January 22, 2014
#Reflection 2
In this chemistry lesson I learned about describing the chemical formula of compound from the relative number of atom present. I learn the difference between the monoatomic and polyatomic element. Monoatomic is when we're combining two single element (metal and non metal) such as N and the atomic mass charge is +1 and O with charge of -2. But polyatomic element is we combine two element (non metal and metal) but the non-metal is with both charge for atomic number and atomic mass. The non-metal element of the monoatomic will be change with ide in the back of the word (oxygen become oxide). But the non-metal element of the polyatomic will be change with ate or ite in the back of the word (depends on the charge of the atomic number and atomic mass). I also learn to find the number of atom in the chemical formula of compound. for example if we react Na+1 with O-2 it will become Na2O so there are 2 atoms of Na and 1 atom of O. Another example is if we combine Li+1 with CO-2 (atomic mass) +3(atomic number) it will become Li2CO3 which is lithium carbonate. And we know that there are 2 atoms of lithium and 1 atom of carbon with 3 atoms of oxygen. However if the formula of the monoatomic is Cu(OH)2, we need to multiply 2 with the inside of the bracket which is O and H, which means there are 1 atom of copper, 2 atoms of oxygen and 2 atom of hydrogen. And if the formula of the polyatomic is CuSO4 . 5H2O, we need to multiply 5 with 2 for the H and move 5 to O, so it will become 1 atom of copper, 1 atom of sulphur, 9 atoms of oxygen and 10 atoms of hydrogen.
Friday, January 17, 2014
Reflection #1 (Alda8A)
Today, 16 January 2014.
Today in chemistry lesson I learn about how to write chemical formula and naming compound, in this case we are reacting metal with non-metal. These are some examples I learned during the chemistry lesson:
For example we want to react Sodium with Sulphur, the first thing we need to know is the oxidation number of each of the element by looking through the periodic table (the group number), from left to right, the oxidation number for each row will be +1, +2, (and skip the transition metals) +3, +4, -3, -2, -1, 0. After determining the oxidation number of each element, sodium (Na) is +1 because its the most left and sulphur (S) is -2 because its the 6th rows. We know that sulphur has a bigger number of oxidation, we need to cross multiply the number of oxidation for each of element. So Na+1 S-2 will become Na2S after we cross multiply which means now there are 2 sodium and 2 sulphur which means that its balanced.
I also learn that if the element is monoatomic, like Nitrogen (N), Oxygen (O) etc, we need to change the last words using "ide" so if its nitrogen, it'll become nitride, oxygen become oxide. However if its polyatomic like Na3, the nitrogen will be replaced with ate so it becomes nitrate. If Na2 it'll become nitrite.
Today in chemistry lesson I learn about how to write chemical formula and naming compound, in this case we are reacting metal with non-metal. These are some examples I learned during the chemistry lesson:
For example we want to react Sodium with Sulphur, the first thing we need to know is the oxidation number of each of the element by looking through the periodic table (the group number), from left to right, the oxidation number for each row will be +1, +2, (and skip the transition metals) +3, +4, -3, -2, -1, 0. After determining the oxidation number of each element, sodium (Na) is +1 because its the most left and sulphur (S) is -2 because its the 6th rows. We know that sulphur has a bigger number of oxidation, we need to cross multiply the number of oxidation for each of element. So Na+1 S-2 will become Na2S after we cross multiply which means now there are 2 sodium and 2 sulphur which means that its balanced.
I also learn that if the element is monoatomic, like Nitrogen (N), Oxygen (O) etc, we need to change the last words using "ide" so if its nitrogen, it'll become nitride, oxygen become oxide. However if its polyatomic like Na3, the nitrogen will be replaced with ate so it becomes nitrate. If Na2 it'll become nitrite.
Sunday, January 12, 2014
Chemistry Semester 2 Goals (Alda8A)
In this school semester 2, I want to improve a lot in chemistry because previous semester my score wasn't really satisfying. My score is decreasing on semester 1 term 2 which makes me want to work harder to achieve a better score for this semester. I want to get at least another 9.7 more and I know I can because I managed to get 9.7 in semester 1 term 1, so I believe that if I keep on trying, practicing and studying I am capable of getting more. How am I going to achieve my goal?
How am I going to achieve my goal is by studying hard. I need to listen more to the teacher when they're explaining, trying not to chat with my friends when the teacher is explaining so I can carefully understand the concept of the subject. And maybe I need to take some courses to help me study individually outside the school hours. And its important that I put more effort when making my homework and when I'm studying so that I give my best so I won't regret the score because previously in semester 1 term 2, my score is decreasing because I don't get perfect scores in my homework like I got perfect scores in semester 1 term 1. I need to study not only the night before I had a test/quiz, I need to study couple of days before to make sure that I am well prepared.
Of course getting 9.7 more on my report is not an easy thing to achieve, but I know what I'm capable of doing if I try harder. I know it's hard to get the score I want, but you will not achieve it if you don't try to because getting the best is never an easy thing to do.
How am I going to achieve my goal is by studying hard. I need to listen more to the teacher when they're explaining, trying not to chat with my friends when the teacher is explaining so I can carefully understand the concept of the subject. And maybe I need to take some courses to help me study individually outside the school hours. And its important that I put more effort when making my homework and when I'm studying so that I give my best so I won't regret the score because previously in semester 1 term 2, my score is decreasing because I don't get perfect scores in my homework like I got perfect scores in semester 1 term 1. I need to study not only the night before I had a test/quiz, I need to study couple of days before to make sure that I am well prepared.
Of course getting 9.7 more on my report is not an easy thing to achieve, but I know what I'm capable of doing if I try harder. I know it's hard to get the score I want, but you will not achieve it if you don't try to because getting the best is never an easy thing to do.
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