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Teacher : good morning students Student : good morning mother Teacher : be it disciples, today we will learn about material classification, the first element, the element is pure substance which can not be described into other simpler substances with ordinary chemical reactions, the element is the basic ingredient of the material. The second is a compound, the compound is a pure substance that can decompose through ordinary chemical reactions to form other simple substances. The compound is a combination of two or more elements present in a material, produced by a chemical reaction. The latter is a mixture, a mixture is a material composed of two or more substances with an irregular composition and still possessing the properties of the original substance. The mixture can be classified into heterogeneous mixtures and homogeneous mixtures. Are the students of you who have not understood the material we are studying today? Student : I am mother (while raising hands), wh...

Chemical reactions in the atmosphere The relative greenhouse effect of different gases in the atmosphere are compared based on their annually averaged “radiative forcing,” a measure of how much energy each gas emits or absorbs per unit area. This is well understood phenomena: laboratory tests of gas interactions with radiation are applied in radiative transfer models of the atmosphere to determine how much heating or cooling can be attributed to each individual greenhouse gas. A recent study by scientists at the NASA Goddard Institute for Space Studies and Columbia University suggests that our understanding of the radiation budget is a little simplistic. The models used by climate researchers usually reflect only the direct effects of a gas’s radiative properties — that is, a gas is modeled to either warm or cool the atmosphere, with no secondary effects on other gases. Of course, the atmosphere is a complex soup of chemicals and gases which interact to v...

Compare compare means describing similarities between the subjects. When we are comparing Uberman and Catman, we might describe their tragic backstories, their secret double lives, and their fondness for crime fighting. Basically, the comparison tells what they have in common. Contrast contrast two things, you explain ways in which they are different. Contrasting Catman and Uberman, we might take note of the way Catman uses his opponent's strength against him, while Uberman depends on brute force. Double buble map Used for Comparing and Contrasting, the third map to be introduced is the Double Bubble Map.This map is created with two Bubble Maps. Two larger circles are drawn with the things to be compared. Middle bubbles are added to show the similarities between the two. Outside bubbles are drawn to the two larger circles with words that show the differences. Organizing your double buble map

1. accuracy = how close a value is to the actual or true value; also see precision 2. acid = a compound that, when dissolved in water, gives a pH of less than 7.0 or a compound that donates a hydrogen ion 3. actinides = the fifteen chemical elements that are between actinium (89) and lawrencium (103 ) 4. aeration = the mixing of air into a liquid or solid 5. alkali metals = the metals of Group 1 on the periodic table 6. allomer = a substance that has different composition than another, but has the same crystalline structure 7. allotropy = elements that can have different structures (and therefore different forms), such as Carbon (diamonds , graphite , and fullerene ) 8. anion = negatively charge ions anode 9. aromaticity = chemical property of conjugated rings that results in unusual stability. See also benzene 10. atom = a chemical element in its smallest form, and is made up of neutrons and proto...

Substance is the material structure does not change. Substances include pure substances and mixtures. Pure substances can be elements and compounds. while the mixture can be a mixture of homogeneous and heterogeneous. Substances can also be classified into acid, alkaline or neutral based on the degree of acidity. A. Elements, Compounds and Mixed Element Consider some kinds of objects, such as screws, rings, pots, pencil, and incandescent lamps. Well, do you know is made of What these objects? Screws made of iron. The ring is made of gold. Wire in incandescent lamps made of tungsten (wolfram). Pan made of aluminum. Pencil lead is made of carbon. Well, iron, gold, tungsten, aluminum, and carbon are examples of elements. After studying the above description, can you conclude whether the element is actually called? The element is a single substance that can not be broken down into other substances simpler through simple chemical reactions. Some of the common elements identified,...