Key Terms Flashcards
(26 cards)
Matter
Anything that has a mass and takes up space
Chemistry
Study of matter and how it changes
Physical properties
Is a characteristic of a substance that can be observed without changing the substance into another substance.
Chemical properties
A characteristic of a substance that describes its ability to change into other substances.
Physical change
Is any change that alters the form or appearance of a substance but does not make the substance into another substance
Chemical change
A change in matter that produces one or more new substances.
Reactants
Substances that undergo change in a chemical reaction
Products
New substances formed by the reaction
Precipitate
A solid that forms from solution during a chemical reaction
Endothermic reaction
The total making and breaking of bonds results in a net absorption of energy
Exothermic reaction
The total making and breaking of bonds results in abbey release of energy
Chemical equation
Is a short, easy way to show a chemical reaction, using symbols instead of words
Conservation of matter
During a chemical reaction, matter is neither created nor destroyed.
Open system
Matter can enter from or escape to the surroundings
Closed systems
Matter is not allowed to enter or leave
Coefficient
Is a number placed on front of a chemical formula in an equation
Synthesis
Two or more elements or compounds combine to make a more complex substance
Decomposition
Occurs when compounds break down into simpler products
Replacement
Two elements in different compounds trade places
Activation energy
The minimum amount of energy needed to start a chemical reaction
Concentration
The amount of a substance in a given volume
Catalyst
Is a material that increases the rate of a reaction by lowering the activation energy
Enzymes
Cells in the body that contain biological catalyst
Inhibitors
A material used to decrease the rate of a reaction
