we have done experiment in school and for homework we must write chemical reactions that have happend during the experiment.

the experiment was like this : first we took an unknown substance than we have put some CuO , we mixed that two substances together in test tube. Than we put cotton in that test tube a than we put CuSO4.Than we heat test tube . On the aperture of tube we put glass with water in , and we still heat tube. and that was that. And I really don't know how to write reactions. Teacher said something about writing CxHy instead of unknown substance. Can someone helpp me because i don't understand this , and i must get a good grade . Thanks

thanks a lot -.- i can use search engine too

-.-"

Based on the experiment you described, it seems like you performed a reaction to determine the empirical formula of the unknown substance. Here's how you can write the chemical reactions involved:

1. Reaction between unknown substance and CuO:
- Unknown substance (CxHy) + CuO -> Cu + H2O

In this reaction, the unknown substance (CxHy) reacts with CuO (Copper(II) oxide) to form Copper (Cu) and water (H2O).

2. Reaction between Cu and CuSO4:
- Cu + CuSO4 -> Cu2(SO4)3

In this reaction, Copper (Cu) reacts with Copper(II) sulfate (CuSO4) to produce Copper(III) sulfate (Cu2(SO4)3).

Please note that the above reactions are based on the assumption that the unknown substance reacted with CuO to produce Copper.

To follow the format mentioned by your teacher, you can substitute "CxHy" with the appropriate empirical formula of the unknown substance. This formula represents the simplest ratio of elements in the compound. However, without further information, it is difficult to determine the exact empirical formula of the unknown substance.

To determine the empirical formula, you will need the mass of the unknown substance and the amounts of other reactants and products involved in the reaction. With this information, you can calculate the molar ratio and determine the empirical formula using the principles of stoichiometry.

It is important to consult with your teacher for further guidance and clarification to ensure accuracy in your homework. Good luck!