Counting atoms
What is a chemical reaction?
When something is new is made
When ice metals that is a ________________ change.
Physical
What is activation energy?
The smallest amount of energy to start a chemical reaction
What must happen to the atoms for a chemical reaction to start?
Energy must break the chemical bonds.
What is a physical change?
When a physical properties is changed and nothing new is created
If a chemical symbol has no subscript how many atoms does it have?
1 atom
When hydrogen, oxygen, and carbon make sugar that is a _______________ change.
Chemical
What is absorbed energy?
Energy is pulled into a reaction
What is a diatomic molecule?
2 atoms of the same element like O2
What is an exothermic reaction?
Chemical reaction where heat is released
Balance this equation:
_2 Na + Cl2 —---> ________
2NaCl
What must be present for a reaction to begin?
Energy
What is released energy?
Energy is released from a reaction
What is a catalyst?
A substance that speeds up a reaction and makes the reaction use less energy to start
What is an endothermic reaction?
Chemical reactions that absorb (heat and feels cold)
How many atoms are in CH4NaCl2?
Eight
What is a single displacement reaction?
When one atom or molecules takes the place of another in a reaction
What kind of reaction is 6CO2 + 6H2O —----> C6H12O6+ 6O2?
Single displacement
What is an Inhibitor?
A substance that slows down or stops a chemical reaction.
Atoms are not gained or lost in a chemical reaction because of which law?
Conservation of Mass
Write the formula for a dioxide tri-carbon molecule.
O2C3
What is a double displacement reaction?
When two molecules switch places in two different compounds in a reaction
List the ways to change the rate of a chemical reaction and give an example of each.
Temperature- cooking
Concentration- saltwater in a chemical reaction.
Surface area- grinding up a substance before the reaction
What type of chemical reaction is this NaCl3 —-----> Na + 3Cl?
Decomposition Reaction
Be able to label the parts of a chemical reaction!
6Cl + H3—---> 3HCl2
Label it