Vocab
One or more substance (reactants) react to form two or more new substances (products).
Chemical reaction
What does an arrow represent in a chemical reaction?
Yields, or reacts
__________ are used to make a skeleton equation, while __________ are used to balance an equation.
Subscripts and Coefficients
Al + O2 -> Al2O3 is an example of this type of equation
Synthesis
In these reactions, when thermal energy is absorbed
endothermic reactions
Describing what you’re seeing in a chemical reaction using chemical formulas instead of words
Chemical equation
2MgO is this in the equation 2Mg + O2 -> 2MgO
Products
Are the correct coefficients when this equation is balanced K + Br2 -> KBr
2, 1, 2
SiO2 + HF -> SiF4 + H2O is and example of this type of equation
Double replacement
Some reactions require more energy to break bonds than is released when new ones are formed.
MORE ENERGY→ less energy
endergonic reactions
Used to represent when something is dissolved in water
aqueous (aq)
2Mg + O2 is this in the equation 2Mg + O2 -> 2MgO
Reactants
Is the correct coefficients for this balanced equation FeCl3 + KOH -> Fe(OH)3 + KCl
1, 3, 1, 3
Fe + CuSO4 ----> Cu + FeSO4 is an example of this type of reaction.
Single Replacement
In these reactions, less energy is required to break the original bonds than is released when new bonds form.
less energy→ MORE ENERGY
exergonic reactions
Small whole numbers that are placed in front the formulas in an equation in order to balance it.
Coefficients
The general form a chemical reaction is written in
Reactant to products
These are the correct coefficients when this chemical equation is balanced P4 + O2 -> P2O5
1, 5, 2
These are products of a combustion reaction of hydrocarbon.
CO2 and H2O
When the energy given off by a reaction is primarily thermal energy, the reaction is called an exothermic reaction
Exothermic reaction
What is an example of a sign of a chemical reaction
color change, temperature change, gas, bubbles, light, fire, etc...
Is the total number of atoms in 3Na2SO4
21
Is the correct coefficients for this balanced equation C7H10N + O2 → CO2 + H2O + NO2
2, 21, 14, 10, 2
Which are the product(s) of this chemical reaction? FeCl3 + NH4OH
Fe(OH)3 + NH4Cl
Examples of this type of reaction include:
dynamite explosion, burning fossil fuels
Exothermic Reaction