Teacher: good morning !!!
Student: morning miss
Teacher: well today we will learn about element chemistry!
Student: i want to ask miss
"Element chemistry pack how many parts miss?
Teacher: the chemical element consists of metal, semi-metal and non-metallic elements
Student: then how do we analyze that it is metal and metal elements?
Teacher: usually the metal is in Group I A and II A while non-metal in Group VIII A.
Student: then what is the difference between metal and non metal?
Teacher: to distinguish it we can see from its form for the metal it is a solid solid for the non-metals are gas and liquid.
Student: what do you think is what happens if metal reacts with metal? And why it can happen?
Teacher: if the metal is reacted with the metal it will not react it because it is in the same phase and the structure and molecule are almost the same.
Student: then what if non metals are reacted with metal?
Teacher: if metal is engaged with non metals will produce bond and will experience a chemical reaction
Student: thank you miss for today!
Teacher: well let's continue our lesson!
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Explain the methods that students can activate?
BalasHapusVarious Learning Methods:
Hapus1. Lecture Method
The teaching method of the lecture is the oral illumination of the learning materials to a group of listeners to achieve certain learning objectives in a relatively large amount. As McHish (1976) points out, through lectures, multiple objectives can be achieved. With the lecture method, the teacher can encourage inspiration for the listener.
Gage and Berliner (1981: 457), suggest lecture methods are suitable for use in learning with certain characteristics. Lectures are suitable for the delivery of learning materials in the form of information and if the learning materials are difficult to obtain.
2. Discussion Method
Discussion learning method is the process of involving two or more participants to interact with each other, and or mutual opinion in solving the problem so as to obtain agreement among them. Learning using discussion method is an interactive learning (Gagne & Briggs 1979: 251).
According to Mc. Keachie-Kulik from the results of his research, compared to lecture methods, discussion methods can improve the child in understanding the concept and problem-solving skills. But in the transformation of knowledge, the use of discussion methods is slower than the use of lectures. So the lecture method is more effective to increase the quantity of knowledge of the child than the method of discussion.
3. Demonstration Method
Demonstration learning method is a very effective learning method to help students find answers to questions such as: How to set it? How does it work? How to process it. Demonstration as a learning method is when a teacher or a demonstrator (outsider is deliberately requested) or a student shows to the whole class or process. For example the operation of an automatic washing machine, how to make cookies, and so on.
Excess Demonstration Method:
A. Student attention can be more centered.
B. Student learning process is more focused on the material being studied.
C. Experience and impression as a result of learning more inherent in students.
Weaknesses Demonstration method:
A. Students are sometimes difficult to see clearly objects that are exhibited.
B. Not all objects can be demonstrated.
C. It is difficult to understand if it is demonstrated by a teacher who lacks the mastery of what is being demonstrated.
4. Lecture Plus Method
Learning Methods Lecture Plus is a teaching method that uses more than one method, ie a lecture method combined with other methods. There are three kinds of lecture plus methods, including:
A. Method of lecture plus question and answer and assignment
B. Lecture method plus discussion and assignment
C. Lecture method plus demonstration and practice (CPDL)
5. Recitation Method
The advantages of the Recitation Method are:
A. Knowledge gained learners from the results of their own learning will be remembered longer.
B. Learners have opportunities to increase courage, initiative, responsibility and independence.
Weaknesses of the Recitation Method are:
A. Sometimes learners commit fraud that learners only imitate the work of others without willing to bother doing it yourself.
B. Sometimes tasks are done by others without supervision.
C. It is difficult to assign tasks that meet individual differences.
6. Experimental Method
The experimental learning method is a way of managing learning in which students perform experimental activities by experiencing and proving themselves something they learn. In this method students are given the opportunity to experience themselves or to conduct themselves by following a process, observing an object, analyzing, proving and drawing its own conclusions about the object being studied.
What is the characteristic of non-metallic elements?
BalasHapusThe properties of nonmetallic elements
HapusThe properties of non-metallic elements include:
- at room temperature there is solid, liquid, and gas;
- generally not shiny except carbon in diamond;
- poor electrical conductor except carbon in graphite form;
- poor heat conductor;
- can not be forged or trained;
- can not be stretched or withdrawn.
Explain the difference between semi metal and non metal?
BalasHapus1. Non-metallic element
HapusCharacter :
- Electrical insulator
- Not shiny
- Usually ruptured if forged and can not be stretched
- At room temperature in the form of liquid and gas, but some are solid
- Has a low boiling point and melting point
Non-metallic element example:
A. Group IA = hydrogen
B. Group IVA = carbon
C. Type VA = nitrogen, phosphorus
D. Group VIA = oxygen, sulfur, selenium
E. Group VIIA = Phosphorus, Clorin, Bromine, Iodine
F. Group VIIIA
2. Semi-metal element
.
Properties: the transition between metal elements and nonmetallic elements.
Example of semi-metallic element:
A. Group IIIA = boron
B. Group IVA = silicon, germanium
C. Type VA = arsenic, antimony
D. Group VIA = tellurium, polonium
Among the most elemental elements of metal, non metal and semi-elemental metals reactive explain?
BalasHapusThe most reactive among nonmetallic or semi-metallic metals is a metal element for example Li, Na, K, Rb, Cs, Fr, which has a large reactivity
HapusWhat is the tendency of oxidation power and reduction of alkali metals? Among which alkali metals, which is the strongest reducer?
BalasHapus1). Alkali metals
HapusThe alkali metal group is a class of active metals (most active). The metal shows a low ionisation energy, a large and negative electrode potential. The conclusion is that generally the diversity of traits in this class is easy to predict in terms of scaling. Some deviations are mainly shown by the main members, namely Li. Some of the different lithium and compounds compared to other alkali metals, among others:
- The solubility of the carbonate, fluoride, hydroxide, and phosphate compounds is low.
- Its ability to form nitride (Li3N)
- Formation of normal oxide (Li2O) instead of peroxide or superoxide
- When heated, decomposition of carbonate compounds and hydroxides to oxides.
In alkali metals, this difference is due to the high density of charge on Li + compared to other alkali metal ions.
Potential electrode. The large and negative value of the electrode potential expresses the tendency for a small reduction process. In contrast, these large and negative values show a tendency to the opposite process, ie oxidation. The oxidized ease is characteristic of the active metals and Li shows the greatest tendency among alkali metals to undergo oxidation to one positive ion in aqueous solution. The oxidation of alkali metal X goes according to the steps.
- Sublimation of the metal solids to the gas state
- ionizing metal atoms in a state of gas into metal ions in a gas state
- Hydration of ions through dissolution of X + (g) in water to produce X + (aq)