Vocab
What is Mass?
The amount of matter in an object.
Explain the importance of balancing equations to understand the law of conservation of mass.
Balancing equations show that matter is neither created nor destroyed.
According to the Law of Conservation of Mass/Matter, all matter is...
neither created or destroyed
Mass can be created
False, mass is neither created or destroyed
What happens to the mass of substances during a chemical reaction? Does it increase, decrease, or stay the same?
Stay the same.
What does it mean to Conserve?
To precent the losss of something
How can you tell if a chemical equation is balanced?
The number of atoms for each element on the reactant side must equal the number of atoms on the product side.
How does the Law of Conservation of Mass/Matter relate to chemical reactions?
It ensures that the total mass of reactants is equal to the total mass of products in a chemical reaction.
Mass can be destroyed
False, mass can neither be created or destroyed
How can you determine if a chemical reaction obeys the Law of Conservation of Mass?
If the reactant atoms are the same number as the Product atoms
What is a PRODUCT?
A substance produced during a chemcial reaction
CH4 + __O2 --> CO2 + __H2O
CH4 + 2O2 --> CO2 + 2H2O
What happens to the mass of the reactants compared to the mass of the products in a chemical reaction, according to the Law of Conservation of Mass?
They are the same.
The Law of Conservation of Mass can be illustrated using a balanced chemical equation.
True
Describe a simple experiment you could conduct to demonstrate the Law of Conservation of Mass.
The baking soda and vinegar experiment where we explored closed and open systems. In the the closed system we place a ballon full of baking soda over a flask of vinegar. In the open system we poured the baking soda in the flask of vinegar without putting the balloon on.
Label the Products and Reactants
2K + 2H2O ---> 2KOH + H2
2K --> Reactant
2H2O --> Reactant
2KOH --> Product
H2 --> Product
P4O10 + __H2O --> __H3PO4
P4O10 + 6H2O --> 4H3PO4
What must be equal on both sides of a balanced chemical equation, according to the Law of Conservation of Mass?
The number of atoms of each element.
The Law of Conservation of Mass applies only to reactions occurring in labs, not those happening in nature.
False
Can you think of any exceptions or situations where the Law of Conservation of Mass may not seem to hold true?
No, the Law of Conservation of Mass is a fundamental principle in chemistry and applies universally to chemical reactions.
Label the Coefficient and Subscrips in this equation:
2Ca3(PO4)2 + 6SiO2 → P4O10 + 6CaSiO3
*See Teacher Board*
__Al + __HCl → __AlCl3 + __H2
2Al + 6HCl → 2AlCl3 + 3H2
Is a closed system or open system better for showing the Law of Conservation of Mass?
A closed system
If a reaction produces 100 grams of a product, and the total mass of the reactants was 120 grams, the Law of Conservation of Mass has been violated.
True
C3H8 + __O2 --> __CO2 + __H2O
C3H8 + 5O2 --> 3CO2 + 4H2O