CHEM pt 3- Chemical Reactions and Changes Flashcards
Properties and Changes Describing Chemical Reactions Law of Conservation of Mass Balancing Chemical Equations Types of Chemical Reactions Corrosion
What is a PHYSICAL property
A description of a substance that does not involve forming a new substance; for example, colour, texture, density, smell, solubility, taste, melting point, and physical state. like something you can tell with your senses
what is a CHEMICAL property
A description of what a substance does as it changes into one or more new substances; for example, corrosion, flammability, or reaction with an acid or base.
something you could tell with expirements and chemical reactions
What is a PHYSICAL change
A change that does not produce a new substance; for example, a change of state. Most physical changes can be reversed. like cutting a peice of paper
What is a CHEMICAL change
The change a substance goes through to produce a new substance; for example, change of colour, heat or light is produced, or bubbles of gas are formed. Chemical changes are typically not reversible.
What does the Law of Conservation of Mass state?
In any given chemical reaction, the total mass of the reactants equals the total mass of the products.
How does mass behave in a chemical reaction according to the Law of Conservation of Mass?
Mass is neither created nor destroyed; it is conserved.
if i use 10 grams each of two different reactants in an expirement whats my final mass?
20g- no matter what no mass is created or destroyed
What do coefficients do in a chemical equation?
Coefficients are numbers placed in front of formulas to balance the atoms on both sides of the equation.
Why do we balance chemical equations?
We balance equations to make sure the same number of atoms are on both sides.
What chemical reaction is this
A + B = AB
synthesis
What chemical reaction is this
AB = A + B
Decomposotion
What chemical reaction is this
A + B C = AC + B
single displacement
What chemical reaction is this
AB + CD = AD + CB
double displacement
define combustion
the rapid reaction of a substance with oxygen to produce oxides and energy; burning
define Complete Combustion
Complete combustion happens when there is plenty of oxygen. It produces carbon dioxide, water, and energy.
define incomplete combustion
Incomplete combustion happens when there isn’t enough oxygen. It can produce carbon monoxide, carbon dioxide, soot, water, and energy.
define corrosion
The breakdown of a metal resulting from reactions with chemicals in its environment.
