reaction1

In the chemical equation, there are reactants and products. We can put (s)(l) or (aq) which are the symbols solid, liquid, aqueous. And the arrow between reactants and products means "yields" or "produce".

There are ficve reaction types: Synthesis, Decomposition, Single Replacement, Double Replacement and Combustion. And when there are reactions between two solutions, you will see that there are color change or bubble form of heat is absorbed ro released.

Solids form precipitation.

When you balance the equation, you can use coefficients to balance both equations.

acid and base

Acid has strong sour taste and base has bitter taste. They can be neutralize by forming salts.


the water is pH scale 7 which is neutral.


We can see which is acid or base by the indicator. indicator changees color blue to red if it's acid and red to blue if it's base.


strong acid has more H ions and strong base has more OH ions.


Example of strong acid is Ammonia and storng base is Sodium Hydroxide

To find the MOlarity is mol/liter
and it's really useful if you know M1V1=M2V2, which shows masses and volumes of two solutions.

stoichiometry

In chemistry, there are many reactions. I saw reations between gas bubbles with fire and between magnesium with fire. When we finished burning magnesium, the mass of magnesium became less than before.

These reactions were really interestion and caught my attention.

Stoichiometry calculate reactants and products. It is also about the mass, moles of two property. I learned formulas which was g x to mol x to mol y to gram y. It was pretty complicated. We had to get a mass and calculate before we do the real calculation. The mole has 6.022 x 10 to the 23power. I learned chemists are doing experiments with exact mass of element. I knew they didn't want to waste them. They calcutlated with periodic table. Periodic table has mass of one mole of every elements. So we could mass of mole easily by looking through the table.