Lesson 1
These are the substances present prior to a chemical reaction.
What are reactants?
Know the difference between reactants and products.
This is a collection of atoms of different substances bonded together to form a new substance.
What is a molecule?
Remember, Molecules are the smallest unit of a compound that can take
place in a chemical reaction.
This reaction absorbs energy from its surroundings.
What is an endothermic reaction?
How many atoms are in the molecule 2 CH4?
What is 10 atoms?
Remember, if it is "none" exemplified by C, then there is 1 atom of that element to multiply with the coefficient.
Coefficients interact with subscripts mathematically this way.
What is multiply/multiplication?
Remember, this is the large number on the same line as your molecule.
These simple reactions occur between two or more elements or smaller compounds to create larger or more compounds.
What is a synthesis reaction?
This can be modeled as A+B -> AB
Most liquids and gasses possess this molecular representation.
What is molecular?
Remember, this is to be made of many different molecules meaning there is no structure allowing our substance to be viscous. Their intermolecular forces are weaker than that of a solid
This is the amount of energy needed to start a chemical reaction.
What is activation energy?
This many atoms of Cl (not an I) exist in this molecule
5 ZnCl2
What are 10 atoms of chlorine?
Remember, the "2" is only attached to the "Cl"; make your T Chart if needed.
This is the term for the moment that bonds are broken, and a new substance begins to form.
What is the transition state?
This reaction is when a compound breaks down into two or more elements or smaller compounds.
What is a decomposition reaction?
Remember, they typically require extra energy in the form of heat, light, or electricity since products typically have more energy than reactants. Electricity is the most common decomposition catalyst. Electrolysis is an example of this reaction.
This is the number under the line in a chemical formula that is attached to the element to its left.
What is the subscript?
This component is added to reactants with the only purpose to slow the reaction down.
What is an inhibitor?
Remember, reactions are slowed down because the activation energy is being increased
What coefficient can be added in the blank to model this equation as balanced?
___ K + Br2 -> 2 KBr
What is 2?
This replacement reaction occurs between two molecules. In this reaction, atoms from each pre-existing compound will switch with one another.
What is a double replacement reaction?
Remember, A single-replacement reaction is a reaction where one element replaces another element in a compound. In these reactions, atoms from the individual element reactant replace the atoms of another reactant that is already a part of a compound
No two substances in their purest form share this measurement.
What is density?
Experiments must be conducted to test the properties of the products
Substances will only react to each other in these; example is 2:1
What are ratios?
These are the numerical relations between two amounts showing the number of times that one value is contained within the other. This is also a mathematical function of division.
Energy is _________ if reactants have MORE chemical energy than products.
Energy is released.
Energy is absorbed if reactants have LESS chemical energy than products.
(Number 9 on Review Paper)
There are this many total atoms on the reactant side of the equation.
S8 + 12 O2 ->
What are 32 total atoms?
Remember to use your TChart as needed.
(S: 1x8)
(O: 12x2)
Double
Explain how the subscript modifies a molecule. What does a subscript apply to?
It ONLY applies to the element to its left UNLESS multiple elements are inside parentheses and the subscript is attached.
Double
What 2 elements are natural, combustible materials (wood, wax, coal, oil.) primarily made of?
Carbon and hydrogen.
These atoms react easily with oxygen causing the burning reaction which signifies the release of energy. The reactions produce carbon dioxide and water in the form of water vapor.
These are the attractive forces between atoms that hold them together in a molecule.
What are chemical bonds?
Know the model types on slide 7 in Lesson 2
This happens to the total energy in a chemical reaction.
What is it remains unchanged.
Remember, energy is transferred, not created or destroyed according to the Law of Conservation of Energy.
There are this many total atoms in this molecule
3 C6H12O6
What is 72 total atoms.
(C: 3x6)
(H: 3x12)
(O: 3x6)
Activation energy for a chemical reaction is generally in this form.
What is thermal energy?
Remember, the second most common form is electricity, often used in laboratory settings.