Which example shows where a coefficient is used correctly to balance the equation?
a. Na + Cl2 → 2NaCl
b. Na + 2Cl2 → 2NaCl
c. 2Na + Cl2 → 2NaCl2
d. 2Na + Cl2 → 2NaCl
What is D?
100
The process by which one or more substances undergo change to produce one or more NEW substances with different properties
What is a chemical reaction?
100
Number that is in front of a molecule and tells how many of that molecule.
What is a coefficient?
100
When energy is released
What is an exothermic reaction?
100
A force that holds 2 atoms together and needs energy to break apart
What is a chemical bond?
200
The number you NEVER change when balancing an equation.
What is a subscript?
200
Color, Gas, Light, Temperature, Odor, Precipitate are signs of what?
What are signs of chemical change?
200
Number that is small, to the right and below a chemical symbol that tells you how many atoms.
What is a subscript?
200
When one element REPLACES another that is part a compound?
What is a single displacement reaction?
200
A reaction is made faster by this
What is a catalyst?
300
The number of atoms that must be on both sides of a balanced equation?
What is the same number of atoms?
300
Type of change that does not change chemical properties and is easily reversed.
What is a physical change?
300
The right side of an equation that tells what new substance was made.
What is a product?
300
When two or more substances COMBINE to form a single compound?
What is a synthesis reaction?
300
States that energy cannot be created or destroyed?
What is the law of conservation of energy ?
400
The law that tells me that matter is neither created nor destroyed.
What is The Law of Conservation of Mass
400
Result of chemical change that is a solid that forms and falls to the bottom.
What is a precipitate?
400
The left side of the equation that tells what goes in to the reaction.
What is the reactant?
400
6CO2 + 6H2O + energy→C6H12O6 + 6O2
What is an endothermic reaction?
400
The minimum amount of energy required for substances to react?
What is the activation energy?
500
energy in must equal energy out
What is the law of conservation?
500
Type of chemical reaction in which ions in two compounds switch places
What is a double displacement reaction
500
An arrow that points from the reactants to the product.
What is the yield sign?
500
Magnesium + Oxygen gas yields Magnesium oxide- What type of reaction?
What is synthesis reaction?
500
a single compound breaks down to form two or more similar compounds