U4- Module 1: Modeling Chemical Reactions Flashcards
Double Replacement Reaction
The anions and cations switch molecules, causing two new compounds to be formed.
Insoluble Precipiate
A compound formed in a double replacement reaction, that either does not follow charge rules or is stated as insoluble on the guideline sheet.
What are the 4 signature features of chemical reactions?
- Chemical reactions involve reactants and products.
- Chemical processes always have some transfer of energy going on.
- Chemical reactions occur at varying speeds.
- Chemical reactions can include both reactants and products in the final state of the reaction.
Reactants
The initial substances in a chemical process that react with each other.
Products
The new substances created in a reaction from the reactants.
What are two examples of energy exchange in a chemical reaction?
Endothermic and Exothermic
What would a reaction that is endothermic look like?
The glass would feel cold because the energy is being absorbed.
What would a reaction that is exothermic look like?
The glass would feel warm because the energy is being released.
What are the 3 assumptions of chemical reactions?
- Particles with different composition and structures are formed due to atoms of the reactants being rearranged.
2.
3.
Chemical reactions
Processes in which the atoms that make up the reactants are rearranged
- conversion of reactants to products
How do you correctly label the two sides of a reaction?
“Start of reaction” and “End of reaction”
What is true about the numbers of each atoms and the mass of the reaction?
They are conserved by being kept in the same container throughout the entire reaction.
Stoichiometric Coefficients
The number in front of a molecule in the chemical formula that shows how much of the molecule is in the reaction.
Excess Molecule
Reactants that did not react and ended up in the product side of the equation
Is the excess molecule apart of the chemical equation?
No
- Subtract from the reactant side to determine that there is no excess molecules in the reaction
What should you always make sure you do when writing the chemical formula?
Write it in the lowest ratio
(divide by common factors)
Limiting Reactant
The reactant that is used up first and limits the amount of excess reactant that can be used.
What does the limiting reactant determine?
The maximum amount of products.
Chemical Changes
The generation of new substances from existing substances
Chemical Equation
Represent the proportions of reactants to products
What is the limiting reactant used to calculate?
The theoretical yield of reactions
