For science exam is it must memorise the equations by heart or their is a way to see what is the product of the reactants?
2007-04-21 18:58:32 · 6 answers · asked by try eating chocoberries 1 in Science & Mathematics ➔ Chemistry
"science equations are only lines". if you want you can learn like this. if it still does not work try to prove the equations so that you know how it happens
2007-04-21 19:05:06 · answer #1 · answered by jefin j 2 · 0⤊ 0⤋
There may be some equations that you would want to memorize, but you should be more aware of the type reactions:
Displacements:
AB + CD = AD + BC
This is the common acid-base reactions, and reactions of two salts where one product salt is very insoluble and precipitates.
Also remember, that unless your are into redox equations, the anions and cations do not lose their identity. You should know which are considered strong acids and which are considered weak acids, as well as strong bases and weak bases.
You should know which groups certain elements are in. For example, the elements of the I and II groups of metals can react with water to form hydroxides and release hydrogen, which drives the reactions to completion. For example:
Na + 2H2O -> H2 + 2 NaOH.
Good luck in your test!!
2007-04-22 02:21:16 · answer #2 · answered by cattbarf 7 · 0⤊ 0⤋
to memorize, I've always relied on flashcards. write the equation on one side, then flip it over. say the equation aloud, and then check if you've gotten it right. eventually you'll have had to repeat it so many times you're gonna get it for sure.
as for products and reactants... just remember the product is what you are DOING to the equation, and the reactant is on the right side of the arrow, which is the RESULT.
2007-04-22 02:07:16 · answer #3 · answered by Patty_08 3 · 0⤊ 0⤋
Science Equations have one advantage that they can be memmorised by writing them spontaneously for 2 or 3 times.
Friend, try writing these Equations 2 or 3 times on your Note-Book.This would prove to be of great help.Best of Luck!!!!!!!!!!For your Exams.....
2007-04-22 02:10:47 · answer #4 · answered by Tanay,the cool guy 2 · 0⤊ 0⤋
You can memorize them by remembering which chemical reaction they fall under. The four chemical reactions they can fall under are a synthesis reaction, a decomposition reaction, a single replacement reaction, and a double replacement reaction.
2007-04-22 11:09:00 · answer #5 · answered by Vivek O 2 · 0⤊ 0⤋
you need to be more specific
2007-04-22 02:01:32 · answer #6 · answered by rockabilly.betty 2 · 0⤊ 0⤋