Physical and Chemical Change
A process that produces a chemical change
What is a chemical reaction?
The substances that exist before the chemical reactions begin
What are reactants?
States that the mass of products must be the same as the mass of the reactants in that chemical equation
What is the law of conservation of mass?
Absorbs thermal energy
What is an endothermic reaction?
Affects only physical properties such as size, shape, and physical state
What is a physical change?
The substances that form as a result of a chemical reaction
What are products?
Releases thermal energy
What is an exothermic reaction?
Produces new substances that have properties different from those of the original substances
What is a chemical change?
Used logic and scientific methods to study experiments and showed that chemical reactions are much like mathematical equations
Who is Antoine Lavoisier?
Burning a paper
What is a chemical change?
Small numbers written to the right of the atoms in chemical formulas
What are subscripts?
The nationality of Antoine Lavoisier
What is French?
Numbers placed before chemical formulas
What are coefficients?
word defined as the ability to do work that is often used in chemical equation
Energy
Change in sight, color, sound, touch, and thermal energy
What are signs of a chemical change?
Sodium Hydrogen Carbonate and Acetic Acid in water
Baking Soda and Vinegar
Birth and Death date of Antoine Lavoisier
What is 1743-1794?
Balanced or Unbalanced:
Ag + H2S → Ag2S + H2
What is an unbalanced chemical equation?
Root word that refers to heat
therm