Definitions
________ _________ is the energy used to start a reaction.
activation energy.
Hydrogens and Oxygens
What is a closed system? give an example.
A system that allows matter to stay. Everything is conserved. terrarium, anything closed- greenhouse, etc.
Is this equation balanced? why or why not
__N2 + __H2 ---> 3NH2
No, because the reactants and the products are not equal.
What language has the most words?
English.
________ Follows the yield signs and is where compounds bond in a chemical reaction
product
List three signs of a chemical reaction
bubbling, light formation, precipitate, color change, & temperature change.
True or false: A hot cup of coffee is a closed system because the smoke from the coffee escapes in the air.
False. It should be an open system.
Is this equation balanced? Why or why not.
2 SnO₂ + H₂ → 2Sn + H₂O
No, because the oxygens are not equal.
What subject does Mrs. Manuel teach?
Social studies
What is the job of the inhibitor in a reaction?`
to stop or slow the reaction.
Which reaction brings molecules together-Also called the get-together reaction?
Synthesis reaction
The water cycle is what kind of system? How do you know?
Open system because energy and mass are transferred.
Why is balancing equations important?
Because it supports the law of conservation. Mass is not created nor destroyed.
The beach.
In electrolysis what was the reactant?
the water molecules.
Which reaction is shown below?
Zn + 2HCl ---> ZnCl2 + H2
Single replacement reactions
Why is burning wood difficult to check against the law of conservation of mass in an open system?
Wood is different in an open system because the CO2 gets carried away by air.
Balance this equation:
___ SnO₂ + ___ H₂ → ___ Sn + ___ H₂O
SnO₂ + 2H₂ → Sn + 2 H₂O
What letter comes after v
w
_________ speeds up reactions
Catalyst
What is the difference between a double replacement reaction and a decomposition reaction
Double replacement is when two compounds swap molecules with each other
decomposition is when molecules break apart.
Scientists prefer which type of system and why?
Scientists prefer closed systems because all matter is conserved.
Balanced this equation:
__ KOH + __ H₃PO₄ → __ K₃PO₄ + __ H₂O
3 KOH + H₃PO₄ → K₃PO₄ + 3 H₂O
Name the three primary colors.
Red, yellow, and blue.