chapter 7- chemical reactions

the ________- the substance that undergo a chemical change

the _______- the new substance that was formed

a chemical __________ is a representation of a chemical reaction in which the reactants and products are expressed as formulas

the big numbers in front of the formula

when a substance undergoes a chemical change, a chemical _______ is occurring

during a chemical reaction, the ______ of the reactants always equals the mass of the product

the law of _______ of ______ states that mass is neither created nor destroyed in a reaction

in order to demonstrate this, the number of _______ of each element on the left side of the arrow must equal the number of atoms on the right side

you can balance the number of atoms by changing the _______ only

you cannot change the _____ and _______

a ________ _______ is when on compound breaks down into 2 or more products

a _____ _______ is a reaction in which 2 or more reactants form one product

a - _____ is one in which 2 different compounds exchange ions and form 2 new compounds

a ______ ________ is one in which a substance reacts rapidly with oxygen, often producing heat and light

just as we classify matter into different types, we can also classify reactions by different types based on the _____ and _________ of reactants and products

a synthesis reaction is a reaction in which 2 or more reactants form ______ product

decomposition is the opposite of ________

a _______- replacement reaction is a reaction in which a single element takes the place of another element in a compound

in a combustion, the reacts are always a _____ and ____

_______ _______ is the energy stored in the chemical bonds of a substance

if energy releases, this is an _____ ______

if energy is absorbed by the surroundings is an ___ ______

during a chemical reaction, energy is either released or absorbed

explain how energy is conserved during a chemical reaction

the heat that is produced by a gas grill is a form of _______ released by the combination between propane and oxygen-- which produces carbon dioxide, water (in vapor form), and heat

chemical reactions involve the breaking of chemical ____ in the reactants and the ______ of new and different chemical bonds in the product

a reaction energy ______ shows the energy change between the reactants and products

if the reactants energy is lower than the products, then that means the reaction absorbed energy, so this is an _____ reaction

if the reactants energy is higher than the products, then that means the reaction _______ energy, so this is an exothermic reaction

this principle is the law of _______ of energy

a ______ _____ is the rate at which reactions change into products over time

temperature, surface area, concentration, stirring

the reaction rate depends on how often and frequently the particles ________

an increase in temperature will _______ the reaction rate

a decrease in temperature will ________ the reaction rate

increasing the temperature increases the ________ frequency

the smaller the particle size of a given mass, the _______ it’s surface area, so the more likely it is to react

an increase in surface area increase the exposure of reactants to one another--which ______ the reaction rate

changing the _______ of the reactants changes the reaction rate

you can change the concentration by changing the ______

you can change the concentration by changing the ______ of the reactant