Signs of Chemical Reactions
A steak browning on a grill is exhibiting this sign of a chemical reaction:
Color Change
Balance the following equation:
__AgI + __Na2S --> __Ag2S + __NaI
2 AgI + Na2S --> Ag2S + 2NaI
The atoms and molecules on the left side of a chemical equation
Reactants
NaCl
A solution of vinegar and baking soda fizzing is an example of this sign of a chemical reaction
Gas released
Balance the following chemical reaction:
__SiO2 + __HF --> __SiF4 + __H2O
SiO2 + 4HF --> SiF4 + 2H2O
The atoms and molecules on the right side of a chemical equation
Products
What is the name of this molecule: C4F6
Tetracarbon Hexafluoride
Why isn't ice melting a sign of a chemical reaction?
No bonds broken or formed
Balance the following chemical equation:
__Fe + __H2SO4 --> __Fe2(SO4)3 + __H2
2 Fe + 3 H2SO4 --> Fe2(SO4)3 + 3 H2
The word represented by the arrow in the center of a chemical reaction
Draw the lewis dot structure for chlorine
Cl with 7 dots around it
Name 2 signs of a chemical reaction shown by lighting a match
Heat released
Light released
odor
Gas released (smoke)
Balance the following equation:
__C3H8 + __O2 -->__CO2 + __H2O
C3H8 + 5 O2 --> 3 CO2 + 4 H2O
Term for the scientific idea that matter cannot be created or destroyed
Law of Conservation of Matter
Draw the lewis dot structure for Na2O
See correct lewis structure
Name 3 signs of a chemical reactions exhibited by cooking pancakes
Heat absorbed
Gas released
Color change
Odor Released
Balance the following chemical equation:
__ (NH4)3PO4 + __Pb(NO3)4 --> __Pb3(PO4)4 + __NH4NO3
4 (NH4)3PO4 + 3 Pb(NO3)4 --> Pb3(PO4)4 + 12 NH4NO3
The term for a reaction that absorbs heat
AND
The term for a reaction that releases heat
Endothermic
AND
Exothermic
See correct lewis structure