Intro to Chemical Reactions Flashcards
1
Q
Evidence of Chemical Reactions
A
MAY indicate that a chemical change has produced one or more new substances:
Change in colour
Energy is released or absorbed
A gas is produced
A precipitate forms
2
Q
how to be certain a chemical reaction has occured
A
to test the product to show that it is a new substance
3
Q
Law of Conservation of Mass
A
atom present in the reactants must also be present in the products
4
Q
Chemical Reactions can be described by
A
Words
Word Equation
Unbalanced or skeleton Equation
Balanced Equation
5
Q
State symbols
A
tell us the state, or form, of each substance in a chemical equatio
6
Q
why are coefficents used
A
in order ot obey law of conservation mass, there needs to be a ratio in which chemical equations react
7
Q
A
