Vocabulary
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Stoichiometry
Stoichiometry Stoichiometry is the basic chemical calculation that states quantitative relation of chemical formulas and chemical equations. Here are the materials you need to know to understand, from the concept of moles and molar masses, empirical formulas and molecular formulas, basic stoichiometry of solutions and ideal gases, and the writing and equalization of reactions, with examples of problems and discussions. Molar and Molar Mass Concepts (}) In SI systems, one mole is defined as the sum of the material composed of entities (atoms, molecules, or other particles) a sum of the atoms in 12 grams of carbon-12. The value of the number of atoms is 6.022 × 1023 called the Avogadro number, NA. See also other material: Electron-Configuration Chemical Association The molar mass,}, is defined as the mass of 1 mol entity (atom, ion, molecule, unit of formula) of matter. The units of the molar mass (}) are grams / mol. M = n \} N = nN_A The concept of stoichiometry Stoichiometric m...
What's the use of adhesion?
BalasHapusUsefulness of Adhesives (Adhesive)
BalasHapusIn general, adhesives are used to fasten certain structural components effectively and easily, especially when the use of jointing techniques (solder, nails, screws) results in distortion, corrosion and other damage
How is the distillation process?
BalasHapusUnderstanding the Distillation Process (Penyuliangan) | Distillation is the process of separating the components from a mixture in the form of a liquid-liquid solution in which the characteristics of the mixture are capable of being mixed and volatile, in addition they have a vapor pressure difference and the result of their separation into their components or groups -group component. Because of the difference in vapor pressure, it can be said that the distillation process is the process of separating the components based on the difference of the boiling point. For example, the distillation process of saline solution is done in the laboratory.
HapusWhat is a catalyst and please give an example?
BalasHapusThe catalyst is a substance that accelerates the rate of reaction of a chemical reaction at a certain temperature, without undergoing change or being used by the reaction itself (see also catalysis). A catalyst plays a role in the reaction but not as a reactant or product.
HapusThe catalyst allows the reaction to take place more rapidly or allow the reaction to lower temperatures due to the changes triggered by the reagent. The catalyst provides an optional route with a lower activation energy. Catalyst reduced energy needed for reaction.
The catalyst can be divided into two main groups: homogeneous catalyst and heterogeneous catalyst. Heterogeneous catalysts are catalysts present in different phases with reactants in their catalyzed reactions, while homogeneous catalysts are in the same phase. One simple example for heterogeneous catalysis is that the catalyst provides a surface in which reagents (or substrates) are temporarily absorbed. The bonds in the substrates are weakened in such a way that adequate new products are formed. Katan atara products and catalyst weaker, so finally released.
The homogeneous catalyst generally reacts with one or more reagents to form a chemical intermediate which further reacts to form the final product of the reaction, in a process which restores the catalyst.
can you give me example og dilution?
BalasHapusDILUTION
HapusDilution is done to obtain a volume of concentration smaller than the existing stock solution. The trick is to add solvent to the existing stock solution. Dilution can be calculated by the formula,
M1.V1 = M2.V2
M1 = Concentrations of the starting substance (molarity of the starting substance)
V1 = Initial Volume
M2 = Concentration after dilution (molarity after dilution)
V2 = Volume after dilution (V1 + Water)
Example 1:
Express the active ingredient in 100 g of a sugar solution which is mixed by mixing 5 g of sugar and 95 g of water.
Answer:
5 g sugar + 95 g water = 100 g mixture (solution)
Sugar - active substance
Water - solvent
Amount of sugar and water - mixture (solution)
In the mixture there is an active ingredient in which:
8
9
10
In comparison between mixed substances = 5: 59 = 1:19
In comparison the antif with the mixture = 5: 100 = 1:20
What is the function of additive?
BalasHapusHere are nine additives contained in the engine oil and its functions.
Hapus1. Anti Oxidant: Prevent the occurrence of oxidation process in molecule lubricant.
2. Detergent: Keep metal surface to be free from dirt.
3. Dispersant: Control and carry impurities to be evenly dispersed in the lubricant.
4. Anti-corrosion or anti-corrosion: Prevent rust on metal parts associated with lubricants.
5. Anti wear: Prevent friction and wear the surface of the machine.
6. Friction modifier: Increases slip rate lubricant film.
7. Pour point despressant: Makes the lubricant easy to flow at low temperatures.
8. Anti foam: Prevent the formation of foam no lubricant.
9. Viscosity improver: Maintains oil viscosity at low and high temperatures.
Please give an example of condensation in daily life.
BalasHapusCondensation in Everyday Life Much like evaporation, condensation also occurs in everyday life. When you walk outside on a cold day, you can see your breath as you exhale. The back air of your lungs is much warmer than the outside air, causing the air vapor to condense into a small mist. Condensation is also visible when you shower the hot air of air vapor overlay the mirror in the bathroom. As the air heats up it comes in contact with a cooler mirror and condiments in the mirror.
HapusWhat are the uses of calcium?
BalasHapusMake it high
HapusPrevent porous bone
Helps blood clotting
Burn fat
Make strong teeth
Helps keep blood pressure