Elements and the periodic table
what is the smallest part of an element?
An atom
what do we call starting materials in a reaction?
Reactants
what kind of energy does food contain?
chemical energy
what does the atomic number tell you?
Number of protons
Law of conservation of mass says what?
Matter can't be created or destroyed, but can transform
A toaster turns electrical into what?
Thermal
what group are the Noble Gases in?
Group 18
Rusting: physical or chemical change?
chemical change
Energy highest at top of a hill?
Potential
what is the symbol for potassium?
K
Reaction forming one product?
synthesis
Flashlight transforms chemical into what?
light+thermal
Elements in the same group share what?
Valence electrons
Reactions that absorbs heat?
Endothermic
photosynthesis energy change?
Light---Chemical