Systems & Conservation of Mass
Explain the difference between an open and closed system.
Open systems aren't sealed shut so matter can get in or out. Closed systems are sealed shut so nothing can get in or out.
What is the property that tells us how a substance interacts with fire?
Flammability
The 3 ingredients that make a bath bomb fizz:
baking soda, citric acid, water
In a closed system the mass of a chemical reaction will decrease
false
Boiling water causes what gas to form?
Water vapor
Can matter be created or destroyed?
NEVER!
If a substance dissolves in water it is considered:
soluble
What gas comes from the bath bomb reaction?
Carbon Dioxide
What is trapped inside of bubbles?
Gas
How are the molecules spaced/moving in a gas?
Far apart moving very fast
True or false: If a system is open, mass can leave or enter the system.
True
The property that tells us if a substance rises or sinks
density
Describe the bath bomb gas' flammability.
It extinguishes a flame
A combination of multiple substances is called a:
mixture
T or F: The type of atoms we start with must be the type of atoms we end with.
True
Give an example of an open system you see every day.
Answers may include: a boiling pot of water, a living organism, a fish tank, earth's atmosphere, etc.
Properties are characteristics of substance that are __________ _________
always true
Is the bath bomb gas more or less dense than air?
More dense (because it sinks)
characteristics of a substance that don't change.
Properties
What is the difference between a physical change and a chemical change?
Hint: *Boiling water is a physical change
*Putting electricity through water is a chemical change
*The bath bomb reaction is a chemical change
A physical change does not produce a different substance - the substances stay the same.
Chemical changes produce a new/different substance.
In a closed system, if you mix vinegar and baking soda and trap the gas, how will the mass change after the reaction?
The mass will stay the same, showing conservation of mass.
What are the three substances required to make the bath bomb fizz?
Baking soda, citric acid, water
How do we know that the bath bomb gas is NOT argon or nitrogen?
There are no nitrogen or argon atoms in our ingredients
less dense substances ___________ and more dense substances __________.
rise : sink
Putting electricity through water causes what two gasses to form?
Hydrogen and oxygen