Ch 6 Test Flashcards
in what type of change elements and/or compounds rearranged to form new substances
Chemical
what is the study of matter and how matter changes
chemistry
A shorter easier way to show chemical reactions using symbols instead of words is called
A chemical equation
The number place below an element symbol in a chemical formula is called
A subscript
writing the shorthand for a compound is known as
A chemical formula
what is the solid that forms from solution during a chemical reaction
precipitate
in chemical reactions what does the principal conservation of mass mean
same kind and number of atoms and reactants and products, matter is not lost or gained
A chemical equation that shows the same number of each kind of Adam on both sides of the equation is said to be
balanced
what is a chemical reaction
produces a new substance
what is an endothermic reaction
Energy is absorbed
what is an exothermic reaction
Energy is given off
physical reaction
change appears
A bottle of hydrogen peroxide that eventually turns into a bottle of water and oxygen gas is an example of what
decomposition reaction
The chemicals that you start with in the reaction that react income before the arow are called the
reactants
The chemicals that are formed are produced during the reaction and come after the arrow are called the
Products
in a chemical equation, what tells you how many atoms or molecules a reactant or product take part in the reaction
coefficient
what is the minimum amount of energy that has to be added to start a reaction
activation energy
A chemical reaction that releases energy in the form of heat is called what
exothermic reaction
A chemical reaction absorbs energy in the form of heat is described as being a
endothermic reaction
matter is not allowed to escape or enter from the surroundings
closed system
went to chemical reaction takes place in matter can enter from or escape the surroundings
Open system
