due Ju This is a graded discussion: 5 points possible Chapter 8 Discussion Answe
ID: 304638 • Letter: D
Question
due Ju This is a graded discussion: 5 points possible Chapter 8 Discussion Answer 3 of the following 4 topics and make one contributing comment to another student's post 1. What are all of the parts of a balanced chemical equation? 2. Name and describe the 3 types of chemical reactions in this chapter 3. Explain the concept of stoichiometry in your own words. 4. Explain the concept of the limiting reactant using a real life example. Dicusion Board S Discussion Board Rbeicasx Search entries or author UnreadA 6 Reply es tions mate Replies are only visible to those who have posted at least one reply + Previous Next » eb and Windows 8 6 8Explanation / Answer
1. The parts of a balanced chemical equation are -
The number of atoms of each element on the both sides must be equal. This should be done using the least possible integers.
The state of each reactant and the product must be mentioned. The states can be solid, liquid, gas or aqueous solution.
If any heat is evolved it should be added on the RHS. If heat is given for the reaction to occur, it should be added on the LHS.
If it is an ionic equation, the number of electrons must be equal on both sides.
It's desirable to write the standard enthalpy of the reaction.
2. The three types of reaction are-
1. Addition - when two or more elements or compounds react to form a heavier compound.
Ex 2H2 + O2 ------> 2H20
2. Decomposition reaction- when a compound breaks into two compounds or elements.
Ex. CaCO3 --------> CaO + CO2
Heat is required for this reaction to occur.
3. Displacement reaction - when a more active metal displaces a less active metal from its salt.
Ex Zn + CuSO4 ---------> ZnSO4 + Cu
Question 4. Limiting reactant- In a chemical reaction, two or more elements or compounds react in a fixed ratio of masses. If a reactant is in excess and the other is in less amount, then the the two reactants react till the reactant that is in less amount is finished. After that the reaction stops. The reactant which was available in less amount thereby became the reason for the reaction to stop, is called the limiting reactant.
Consider a lighted candle. Wax and oxygen is needed for the combustion reaction. Oxygen is available in the atmosphere in a huge amount. But, as the wax of the candle is finished, there is no combustion after that. Hence, wax is the limiting reactant here.
Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.